1 1 1 



Spondyhis hystrix has usually an orbicular shell, and the shell valves are covered with 

 fine ridges bearing large numbers of thin, long, erect spines. The shells are of a white or 

 straw colour, and there are usually a fair number of light purple dots scattered irregularly on this 

 background. 



Distribution : — 6^. hystrix is widely distributed in the Indo-Pacific Région, and has also 

 been recorded from the Persian Gulf. 



In the "Siboga" collection there is a single young spécimen of the species collected from 

 the Lumu Lumu shoal, Bornéo Bank (St. 78). 



4. Spondylus hystrix var. ocellatus Reeve. 



1856. Spondylus ocellatus Reeve, Conch. Icon., IX, Spondylus, pi. XII, fig. 43. 



1858. Spondylus ocellatus Adams, H. & A., Gen. Rec. Moll., Il, p. 561. 



1858. Spondylus ocellatus Kùster in Martini-Chemn. Conch. -Cab. (N. F'.), VII (2), Pectinacea, 



p. 23, pi. IX, fig. 4. 



1860. Spondylus ocellatus Reeve, Elem. Conch., II, p. 54. 



1884. Spondyhis ocellatus Brazier, Proc. Linn. Soc. N. S. Wales, IX, p. 803. 



1890. Spondylus ocellatus Paetel, Cat. Conch. Samm., III, p. 240. 



1896. Spondylus ocellatus Casto de Elera, Cat. Sist. Filip., p. 813. 



1899. Spondylus ocellatus Hedley, Mem. Austral. Mus., III, pp. 493, 528. 



1905. Spondylus ocellatus Hidalgo, Cat. Filip., p. 384. 



1909. Spondyhis cocchieus Lynge (ex parte, non Lamarck) Lynge, D. Kgl. Dansk. Vidensk. 



Selsk. Skr. Nat.-Math., (7) V, p. 150. 



191 5. Spondylus liystryx var. ocellatus Fulton, Journ. Conch., XIV, p. 334. 



1916. Spondylus hystrix var. ocellatus Hedley, Journ. Proc. Roy. Soc. W. Australia, I, p. 158. 

 1928. Spondylus ocellatus Faustino, Summary Philippine Mar. Freshw. Moll., p. 35. 



Reeve's species 5. ocellatus is, as Fulton concluded, only a variety of S. hystrix. The 

 shells of this form differ usually in being more oblique and having a more délicate sculpture. 

 Lynge was of opinion that 5. ducalis^ S. fragilis and several other species of Reeve and Sowerby 

 are only varieties of the same form. With the material available I am unable to offer any 

 definite remarks regarding this suggestion, but there can be little doubt that they are very 

 closely allied forms. 



Distribution : — S. hystrix var. ocellatus has so far been recorded from round Australia 

 and the Philippines. The two records from the "Siboga" collection are from the Java and Banda seas. 



The "Siboga" Expédition collected a fair number of shells of this variety at the Anchorage 

 off Pulu Kawassang, Paternoster Islands (St. 40) and the Anchorage South ofLucipara Group (St. 225). 



5. Spondylus dîtcalis Roding. 



1758. Huître de couleur cendrée etc., Seba, Thés., III, p. 179, pi. LXXXVIII, figs. 4, 4, 9. 

 1784. Spondylus ducalis, etc. Chemnitz, Conch. -Cab., VII, p. 89, pi. XLVII, figs. 477, 478. 

 1788. Spondylus ducalis Schroter, Conch. -Cab. Namen Reg., p. 99. 

 1790. Spondylus gaedaropus, var. tt, Gmelin, Syst. Nat., (éd. XIII), p. 3297. 



1797. Bruguière, Encyclopéd. Méthod., pi. CXCIII, figs. 2a, b. 



1798. Spondylus ducalis Roding, Mus. Boltenianum, p. 194. 



18 19. Spondylus ducalis Lamarck, Anim. sans Vertèb., VI, p. 191. 



1824. Spondyhis ducalis Dubois, Epitome, p. 122. 



1825. Spondylus ducalis var., Sowerby, Cat. Tankerville, p. 26. 

 1830. Spondyhis ducalis Sowerby, Gen. Shells, II, fig. 4. 



