On the crustacea collected during the 'Skeat expedition' to the Malay peninsula. Pt. II. Anomura, Cirripedia, and Isopoda / by W.F. Lanchester.
- Lanchester, William Foster.
- Date:
- 1902
Licence: In copyright
Credit: On the crustacea collected during the 'Skeat expedition' to the Malay peninsula. Pt. II. Anomura, Cirripedia, and Isopoda / 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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![Loc. Pulau Bidan, Penang. Two females, one with ova. Also another female, from JVeris, with a small Ascidian attached to the left sides of the 2nd and 3rd abdominal segments. 20. CcENOBITA PERLATUS M.-Edw. Ccenobita perlatus M.-Edw. Hist. Nat. Crust, ii. p. 242 (1837); JVIiers, ‘Alert’ Crust, p. 555 (1884). Loc. ? Three females, from Murex. Miers has noted (l. c. supra) the fact that in this species “ there is an oblique row of somewhat more elongated tubercles on the upper surface of the palm, occupying the place of the series of oblique ridges in C. rugosa ”; such an arrangement I find in these three specimens. But the specimens in question being somewhat small, the tubercles on the legs are noticeably less prominent and less pearly than in typical examples; the carapace also is less rugose. B. CIRRIPEDIA. X. Genus Balanus da Costa. 21. Balanus amphitrite Darwin. Balanus amphitrite Darwin, ‘ Balanidse,’ p. 240, pi. v. (1854). Loc. Patani. On pieces of wood, var communis; on Murex, var. obscurus; on Lamellibranch shells, var. niveus. Luoc. Singora. On Lamellibranch shells, var. obscurus, and var. niveus. 22. Balanus amaryllis dissimilis, subsp. nov. (Plate XXXIY. figs. 3-3 c.) ? Balanus amaryllis var. ? Weltner, Arch. f. Naturg. lxiii. 1, p. 270 (1897). Cf. Balanus amaryllis Darwin, ‘ Balanidse,’ p. 279, pi. vii. fig. 6 (1854); Hoek, ‘Challenger’ Cirripedia, p. 153 (1883). Loc. Kota Bharu, Kelantan. This subspecies is represented here by two distinct forms: one, the subspecies itself, of which there are seven large examples; the other a colour-variety, of which there are several smaller examples, attached to pieces of a Gorgonian. These two forms well illustrate the difficulty, which must sometimes arise, of finding a satisfactory place in the binomial system of nomen- clature for certain divergent forms. Thus, in the present instance, No. I., though closely allied to the species B. amaryllis, yet shows sufficiently divergent structural characteristics to be ranked as a distinct variety, if considered alone. But the presence of No. II. necessitates some sort of modification of this conception ; for, while exhibiting the same structural divergence, it also differs in colour arrangement: thus it becomes incumbent to form either a subvariety for No. II., or a subspecies for No. I. And in view of the fairly numerous instances in which Darwin has considered colour differences as of varietal worth (vide, e. g., Prgc. Zool. Soc.—1902, Yol. II. No. XXIY. 24 [7]](https://iiif.wellcomecollection.org/image/b22406554_0011.jp2/full/800%2C/0/default.jpg)
