A Revised List of British Echiiioidea. 421 



9. Neolampas, Agassiz. 

 1869. Neolampas, Agassiz, Bull. Mus. Coiiip. Zool., i., p. 271. 



Test thin, outline pyriform, profile arched, truncate behind ; 

 anal opening jirojecting as a tube ; tubercles of uniform size over 

 the whole test ; ambulacral system simple, without petals, reduced 

 to single pores between the ambulacral plates. 



19. Neolampas rostellata, Agassiz. 



1869. Neolampas rostellata, Agassiz, Bull. Mus. Comp. Zool., i., 



p. 271. 

 1872. ,, ,, Id., Rev. Echin., pp. 147, 340, 551, 



pi. xvii., figs. 1-12. 

 1874. ., ,, Wyville Thomson, " Porcupine" Echin., 



Phil. Trans., p. 745, pi. Ixix. 

 1883. ,, ,, Agassiz, "Blake" Echini, Mem. Mus. 



Comp. Zool., X., p. 44, pi. xxii. 



Diagnosis. 



As there is only one species known, the characters given above 

 will suffice for its recognition. I have not seen a specimen of the 

 species. 



Distribution. 



British Seas. — Off the mouth of the English Channel, " Porcu- 

 pine" (1870), St. 3, 690 fms. (Thomson, 2). 



Other Localities. — Between Cuba and Florida, 100-125 fms. 

 (Agassiz, 1). Florida Bank, 229 fms. (Agassiz, 5). 



Spatangid^. 



Test ovoid or cordiform, longer than broad, usually with an 

 anterior groove ; apical system with four or less perforated 

 plates ; anterior ambulacrum differing from the others ', periproct 

 in the posterior ambulacrum. 



10. Schizaster, L. Agassiz. 



1835. Schizaster, L. Agassiz, Prodr. Echin., Mem. Soc. Neuchatel, 

 for 1834, p. 185. 



Test thin, elongate; highest point posterior; lateral ambulacra 

 unequal and depressed ; anterior in a deep groove, to which the 

 antero-lateral petals are almost parallel ; genital pores two or 

 three ; dorsal impression angular, near the petals ; lateral impres- 

 sion narrow, descending beneath the anal system, subanal fasciole 

 absent ; posterior oral lip prominent, recurved. 



