On the crustacea collected during the 'Skeat expedition' to the Malay peninsula : together with a note on the genus Actaeopsis. Pt. I. [Brachyura, Stomatopoda, and Macrura] / by W.F. Lanchester.

Lanchester, William Foster.

Date:: 1901

Credit: On the crustacea collected during the 'Skeat expedition' to the Malay peninsula : together with a note on the genus Actaeopsis. Pt. I. [Brachyura, Stomatopoda, and Macrura] / by W.F. Lanchester. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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$smaller areas within the broad areas, and still smaller areas (habitats) within these, peculiar to that species ; and it is these smallest, quite local, areas to which attention needs to be directed in order to elucidate the causes of confinement to a special habitat, or, on the other hand, to answer the question: Does the same species adopt the same habitat in different distributional areas ? I have already noted (P. Z. S. 1900, “ On Crustaceans from Singapore and Malacca”) how certain Leucosiids were obtained there from mud which had been found by Adams and White (‘ Samarang ’ Crustacea) in the China Sea on a clean sandy or rocky bottom. Such a difference of habitat is most striking and seems to me to require explanation : this explanation, however, can hardly be arrived at until more data of a similar kind are forthcoming. I have taken my measurements of length and breadth in a ^ similar way to those given in my paper already cited {vide P. Z. S. 1900, p. 720). In those cases, however, in which no supraocular or prseocular spine is present (Macrura &c.) I have measured from the upper internal angle of the orbit. The units are in milli- metres, and the first figure given in each case stands for the breadth. I. Genus Doclea Leach. 1. Doclea oanalifera Stimpson. Doclea canalifera^ Stimpson, Proc. Ac. Nat. Sci. Philad. p. 217 (1857); Alcock. Journ. As. Soc. Beug. Ixiv. 2, p. 228 (18961. Log. Pulau Bidan, Penang. A single male ; all the legs absent. This individual agrees closely vith Major Alcock’s description; but there are two small points which may be noticed in connection with it, as neither Major Alcock nor Stimpson make any mention of them. On the gastric region are “ some minute tubercles followed by a spine.” The number of the tubercles here in front of the spine is five, of which the two anterior lie transversely close to each other, exactly at the level of the back of the orbits, each tubercle corresponding to one of the posteriorly coalesced rostral spines, the distinction of the two being still indicated at this level. Besides the oblique line of tubercles on the hepatic region, moreover, there may be seen three more in front of this line, one in front of, and the other two (transversely placed) behind, the level of the first lateral spine. Dim. 23 X 25'5. II. Genus Schizophrys White. 2. SCHIZOPHRYS ASPERA M.-Edw. Mithrax aspera, M.-Edw. Hist. Nat. Crust, i. p. 320 (1834). Dione affinis, de Haan, Crust. Japon. p. 94, pi. xxii. fig. 4 (1839). Scliizophrys aspera, A. M.-Edw\ Nouv. Arch. Mus. viii. p. 231, pi. x. fig. 1 (1872); Hasw. Cat. Austr. Crust, p. 22 (1881). Log. Pulau Bidan, Penang. A female.- [3]$