6 TH. MORTENSEN, ECHINOIDEA. 



2. Prionocidaris bispinosa (Lamk.). 



Pl. III, Fig. 1. 



Cidarites bispinosa. Lamakok. 1816. Hist. nat. des animaux sans vertébres. III, p. 57. 



Ph illaca uthus annulifera. A. Agassiz. 1872—73. Rev. of the Echini, p. 150,387. Pl. I. e. Figs. 21— 26. 



Rhabdocidaris bispinosa. De Loriol. 1873. Description de trois espéces d'Échinides. Mém. Soc. Se. 



nat. Neuchatel V, p. 33. Pl. V. 

 annulifera. Bedford. 1900. On Ecliinoderms from Singapore and Malakka. Proc. Zool. 



Soc. p. 274. Pl. XXI. Figs. l.a-d. 

 Leiocidaris bispinosa. Döderlein. 1902. Bericht iiber die v. Herrn Prof. Semon bei Amboina u. Thnrs- 



day Isl. ges. Echinoidea. Jen. Denksclir. VIII p. 695. Taf. LV1II. Fig. 5-11. 

 Stephanocidaris bispinosa. 'la. Mortensen. 1903. »Ingolf» Echinoidea I. p. 17, 19, 28, 172. Pl. X. 



Fig. 17. 

 1904. The Danish Expedition to Siarn. Echinoidea I. Mém. Acad. R. d. Se. 



Copenhague. 7 Sér. I, p. 6. Pl. II, Figs. 3. 17, 18; Pl. IV, Fig. 30; Pl. V. 



Figs. 20, 25. 

 Cidaris (Stephanocidaris) bispinosa. De Meijeke. 1904. Die Echinoidea d. »Siboga»-Expedition. -Siboga»- 



Expediiie. XLII, p. 4, Taf. II, 4; Taf. 11,14. 

 Stephanocidaris bispinosa. Döderlein. 1 906. Die Echinoiden d. deutschen Tiefsee-Exped., p. 92. Taf. 



44; Fig. 4. a— i. 

 Phyllacanthus annulifera. A. Agassiz & H. L. Clark. 1907. Hawaiian a. o. Pacific Echini. The 



Cidaridae. Mem. Mus. C. Z. 34, p. 15. Pl. XII, b. Figs. 14—15. 

 II. L. Clark. 1907. The Cidaridae. Bull. Mus. Comp. Zool. 51, p. 188. 

 Plococidaris bispinosa. Tu. Mortensen. 1909 Die Echinoiden d. deutschen Siidpolar-IOxped. Deutsche 



Sttdp. Exp. 1901—3. Bd. XI. Zoologie III, p. 50, 53. 

 Prionocidaris bispinosa. Döderlein. 1911. Uher Echinoidea v. den Aiu-Inseln. Abh. d. Senckeub. 



Naturf. Ges. Bd. 34, p. 240. Taf. IX, Fig. 1 — 2. 

 Phyllacanthus annulifera. II L. Clakk. 1914. The Ecliinoderms of the Western Australiau Museum. 



Rec. W. A. Museum. I, p. 161. 

 Prionocidaris bispinosa. Döderlein. 1914. Echinoidea. Fauna Siidwest Australiens. Ergebn. d. Ilam- 



burger Siidw. Austr. Forschungsreise. 1905, p. 451. 



Of this species there are three fine, large, dried specimens, labelled Cape Jau- 

 bert, and a fourth in aleohol, labelled 45 Miles W.S.W. of Cape Jaubert, 24 — 27 meters 

 (3 — 14/V T 1I. 1911). They must be referred to the forma typica, on account of the 

 eharacter of their radioles. They are all very conspicuously coloured, deep red-brown, 

 both on the secondary spines and on the collar of the radioles. The fevv radioles, 

 which are not completely covered with foreign organisms, show that they are banded 

 with red-brown bands. Also the test is exceptionally coloured, of a deep violet 

 color, especially in the ambulacral areas and on the apical area. A very conspicuous 

 feature is the widened, crownshaped tip of the actinal radioles (Pl. III, Fig. 1). 

 None of the specimens ha ve large globiferous pedicellariae. 



Besides these larger specimens there is a small one (Pl. IV, Fig. 3), also from 

 45 Miles W.S.W. of Cape Jaubert, 24 — 27 meters, which is peculiar through its very 

 short radioles, the longest being only 22 mm, and those of the aboral side (the fully 

 formed, of course) only 13 — 15 mm. (The horizontal diameter of the specimen is 28 

 mm.) The adoral radioles are crownshaped widened as in the typical form. The 

 secondary spines are white, with a sharply limited red-brown midline. The test is 

 white. The ocular plates are almost naked, while the genital plates are rather 

 closely covered with spines. All this, combined with the rather broad, naked ambula- 

 cral midline, results in a quite unusual and most exquisite coloration. 



