On the sponges collected during the 'Skeat expedition' to the Malay peninsula, 1899-1900 / by Igerna B.J. Sollas.

  • Sollas, Igerna Brünhilda Johnson.
Date:
1902
Catalogue details

Licence: In copyright

Credit: On the sponges collected during the 'Skeat expedition' to the Malay peninsula, 1899-1900 / by Igerna B.J. Sollas. 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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    this conclusion I have seen Maas’s paper (SB. Akad. Wiss. Miinchen, 1900, pp. 553-569). Maas describes the origin of spherasters fi‘om a pair of small calthrops, and I am hence at a loss to account for the globules unless we may suggest that the spherasters have more than one mode of origin. Great Redang. 16. Tethya maza Sel. Tethya maza Selenka, Zeitschr. f. wiss. Zool. xxxii. p. 472, pl.xxviii. (1879); Sollas, Yoy. H.M.S. ‘Challenger,’ vol. xxv. p. 440. Sponge hemispherical. The curved surface is raised into low, more or less hexagonal bosses. In the depression between the raised areas are the pores leading into extensive, very regularly arranged, intercortical cavities. The cortex is fibrous only in its inner part. Oscula absent or not distinguishable from the pores. Colour in spirit greyish white. Diameter of circular base 12mm. The specimen is n ot gemmiferous. Megascleres ; Strongyloxeas 1‘20 X 0’025 ; 0*8 x 0*013 mm. Microscleres : Spherasters of many sizes, the maximum diameter is 0*056 ; centrum 0*025 mm. Chiasters abundant in the dermal membrane and occurring also in the choanosome, 0*009-0*012 mm. Oxyasters 0*025-0*031 mm.; actines slender, beset with spines so low as to be mere roughenings. These microscleres often have only 6 rays lying in 3 axes at light angles ; in this case one pair of rays is longer than the other two pairs, which are equal to one another. Pulau Bidang. 17. Hymedesmia hallezi Topsent. Hymedosmia hallezi Topsent, Arch, de Zool. Exp. (3) t. viii. p. 119 (1900). Sponge growing on a lamellibranch shell together with Samus anonymus. Besides the spicules of the vertical bundles which rest with their oval heads in contact with the surface of support, other more slender tylostyles lie horizontally. The microscleres are distributed uniformly. They are asters of which the slender rays are swollen at the tips. There is a distinct centrum somewhat sharply marked off from the rays. They thus differ to a certain extent from those of the type ; but as Topsent mentions that the rays of the spherasters of H. hallezi sometimes end in a petit houton non Uargi^’’ this difference is probably unimportant. Vertical tylostyles 0*6-0*88 x 0*01 mm. Horizontal tylostyles 0*50 X 0*002-0*003 and 0*56 x 0*007. Pulau Bidang. 18. Spirastrella inconstans Dendy. (Plate XIY. fig. 3.) Spirastrella inconstans Thiele, Studien fiber pacifische Spongien, Zoologica, xxiv. ii. p. 10, pis. 1 & 5. A single specimen with the note : “ a grey sponge from between the stones between tide-marks. Loc. Pulau Bidang, R. Evans [8]