OCR Text |
Show 1884.] SPECIES OF OREASTER. 65 TRIPLACANTHIDA. a. Lophial and ventral spines. westermanni. (3. Marginal spines also developed. superbus. y. Dorsal spines also developed. gracilis. grayi. orientalis. troscheli. muelleri. In the case of such species as I have been able to see I have a fresh description; where specimens have been wanting, I have, in the case of Dr. Liitken's forms, copied his Latin diagnoses, and for other species I have drawn up brief diagnoses based on the descriptions of preceding writers. OREASTER AUSTRALIS. Oreaster australis, Liitken, Vidensk. Med. 1871, p. 263 (Australia). " Dorsum altum ; brachia angusta, acuta, elongata ; radius stella? major minorem triplum fere cequat; tessella? marginales c. dorsales angulorum a margine paulum remotes; tubercula minuta singula in tessellis marginis ventralibus plerumque adsunt, in marginalibus dorsi angulorum vero perpauca, brachiorum crebriora; in tessellis dorsalibus propriis plerumque adsunt, regulariter disposita, series quinas in brachiis formantia, tuber cutis c. 13-14 majoribus gaudente ; intimum seriei cujus-cunque omnium maximum; arece poriferce confluentes, poris numerosissimis ; tessella? ventrales propria granulatione obtecta?, haud conspicua?, granula minuta pedicellariasque numerosissimas lineares elongatas gerunt; papillae ambulacrales interna? externa terna? (rarius quaterna?) ; papilla3, orales ori proximo? series singulas (non ut fieri solet duplices) formant. Hab. ad oras Australian (Novse Hollandise)." OREASTER FORCIPULOSUS. Oreaster forcipulosus, Liitken, Vidensk. Med. 1864, p. 156. "Brachia angusta, acuminata; radius stellce major minorem duplum a?quat; dorsum deplanatum nodosum; tubercula vel spina? omnino nulla? in tessellis marginalibus, dorsalibus, pedicellaricB valvata? maxima? numerosissimee (7-vero in omnibus hisce tessellis ; area? poriferai sexseriata?, distinct ce, poris c. 20 ; papillre ambulacrales externa 3 (2-West Africa. PROC. ZOOL. SOC.-1884, No. V. 5 |