Q TH. MORTENSEN, ECHINOIUEA. 



2. Prionocidaris bispinosa (Lamk.). 



PI. HI, Fig. 1. 



Cklarites bispinosa. Lamakck. 1816. Hist. uat. des animaux sans vertebres. Ill, p. 57. 

 Ph/Uacanthus annulifera. A. Agassiz. 1872—73. Rev. of the Echini, p. 150, 387. PI. I. e. Figs. 21 — 26. 

 Bhabdocidaris bispinosa. De Lukioi.. 1873. Description de trois especes d'Echinides. Mem. See. So. 



nat. Neuchatcl V, p. .33. Pi. V. 

 » annulifem. Bedford. 1900. On Erhinoderms from Singapore and Malakka. Proc. Zool. 



Soc. p. 274. Pi. XXI. Figs, l.a-d. 

 Lciocidaris bispinosa. DOdeelein. 1902. Bericht uber die v. Herrn Prof. Semen bei Amboina u. Thurs- 

 day Isl. ges. Echinoidea. Jen. Denkschr. VIII p. 695. Taf. LVIII. Fig. 5 11. 

 Stephaiwcidarig bispinosa. Tn. Mortensen. 1903. -Ingolf^ Echinoidea I. p. 17, 19, 28, 172. PI. X. 



Fig. 17. 

 » » 1904. The Danish Expedition to Siam. Echinoidea I. Mem. Acad. R. d. Sc. 



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



Figs. 20, 25. 

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



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

 Stephanocidaris bispinosa. DOdeelein. 1906. Die Echinoiden d. deutschen Tiefsee-Exped., p. 92. Taf. 



44; Fig. 4. a— i. 

 Phi/llacanthits anmiUfem. A. Agassiz • & H. L. Clark. 1907. Hawaiian a. o. Pacific Echini. The 



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

 )> ^> H. L. Clark. 1907. Tiie Cidaridae. Bull. Mus. Conip. Zool. 51, p. 188. 



Plococidaris bispinosa. Tu. Mortensen. 1909. Die Echinoiden d. deutschen Siulpolar-Exped. Deutsche 



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

 Prionocidai-is bispinosa. Dudeklein. 1911. Uber Echinoidea v. den Aiu-Inseln. Abh. d. Senekenb. 



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

 PhyllacantJiiis annnlifcra. H L. Clahk. 1914. Tiie Echinoderms of the Western Australian Museum. 



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

 Prionocidaris bispinosa. DOdeblein. 1914. Echinoidea. Fauna Siidwest Australiens. Ergebu. d. Ham- 

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



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

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

 (3 — 14/V'lI. 1911). They must be referred to the forma iy-pica, on account of the 

 character 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 few 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 (PI. Ill, Fig. 1). 

 None of the specimens have large globiferous pedicellariae. 



Besides these larger specimens there is a small one (PI. 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. 



