18 

 3. Astropyga radiata (Leske). 



PI. III. Figs. 15, 19. PI. IV. Figs. 9, 17. PI. V. Fig. 27. 



Cklaris radiala. Luskf,. 177cS. Adclitament;i ;id ,1. Th. Kleinil Naturalis Dispositif) Ecliinoderinatum. 



p. 52. PI. 44. 1. 

 Astnipynii radiala. Agassi/, & Desor. 184Ö. Catal. raisonné des Kehinodermes. \>. 41. 

 Astropyga niossambica. Pkteus. 1854. Üljer die an d. Kiiste v. Mossaniljique beoliaclit. Seeigel, p. 112. 

 Fig. 1. 



— radiata. v. Martens. 1866. Über ostasiatische Echinodermen. p. 157. 



— — Agassiz. 1872. Rev. of Ech. p. 94, 420. PI. XXIV. Fig. 40. 



— elastica. Studer. 1876. Über Echinod. a. d. antarkt. Meere u. zwei neue Seeigel a. d. Papua- 



Inseln. Monatsber. d. Berl. Akad. 1876. p. 464. 



— — Studer. 1881. Libers, über die während d. Heise S. M. Corv. „Gazelle" gcs. Echinoiden. 



Ibid. p. 869. 



— radiata. de Loriol. 1883. Catalogue rais. Echinod. à l'île Maurice, p. 18. 



— Freudenbergi. P. u. F. Sarasin. 1887. Ergebn. naturw. Forsch, auf Ceylon. 1. p. 16. PI. 1. 



— radiata. Dôderlein. 1888. Echinod. von Ceylon. Zool. Jahrb. Syst. III. p. 834. 



— — Sluiteh. 1889. Die Evertebr. a. d. Samml. naturw. Vereins Batavia. Echinoidea 



p. 290. 



— — KoEHLER. 1895. Catalogue rais. Echinod. îles de la Sonde, p. 412. PI. IX. Fig. 9. 



— — DÔDERLEIN. 19(12. Kericht über d. v. Herrn Prof. Semon bei Amboina u. Thursday 



Isl. ges. Echinoidea. p. 699. PI. 59. Fig. 67. 



— — DE Meliere. 1904. Echinoidea der Siboga-Exped. p. 56. 



Other references to the old literature are found in Agassiz' „Rev. of Ech." p. 94. 



After the careful description of this species lately given by Dôderlein (Op. 

 cit.) 1 need not say anything of the structure of the test; only a single fact I 

 might point out, viz. that in the ambulacra primary tubercles are not found on all 

 the anibulacral plates, but only on every second or third plate '), as is indeed 

 well seen on the figures given by Dôderlein. Only at the peristome (and in 

 young specimens) there is an almost regular series of primary anibulacral tubercles, 

 one to each plate. (For a most careful examination of the composition of tlie 

 ambulacra in Astropyga comp. Duncan. On the anatomy of the Ambulacra of 

 recent Diadematidæ. J. Linn. Soc. Zool. XIX. 1885. p. 107. Pl.V. Fig. 9 -10). 



The primary spines of the abactinal side, especially the anibulacral ones 

 are a little curved at the base ; the fine secondary spines, abactinal and actinal are 

 very distinctly curved. This fact also holds good for A. puluinata. The milled ring 

 is oblique, as figured by Peters (Op. cit. Fig. 1 a.); this is a very prominent feature, 

 especially on the large spines al the ambitus. A fe-w small spines are found on 

 the buccal plates. 



The spicules (PI. IV. Fig. 9) are small, irregular, triradiate bodies, arranged 

 in mostly 5 longitudinal series; below the sucking disk they are rather numerous, 



') In the description of A. pulvinata in „Rev. of Ech." Agassiz has noticed this feature (p. 419), 

 and perhaps the sentence „between most of the primaries a small secondary is intercalated" in the 

 description of A. radiata means the same thing (p. 420). A. denndata de Meijere has a primary tubercle 

 on each aiubulacral plate iDe Meijere Op. cit. p. 58 1. 



