274 A. Alcock — Account of the Veep Sea Collection. [No. 4, 



and sparser on the actinal surface, and at the tumid inter-radial peris- 

 toniial margins form, fan-like tufts. 



Ambulacra equal, narrow, petaloid abactinally, the poriferous 

 areas of unequal length in the same petal, approaching as if to close, 

 and then again diverging, the pairs of pores set very close together in 

 grooves separated by moniliform ridges : beyond the petals the ambu- 

 lacra iucrease considerably in width to the ambitus, whence they taper 

 to the peristome, while the pores become single, distant, and invisible 

 to the naked eye as far as the vicinity of the peristome, where they are 

 again large and double, and are crowded together to form distinct 

 phyllodes. 



Inter-radia large, constricted very abruptly at the apical system and 

 gradually at the peristome, being represented at the peristomial margin 

 by a single tumid granular plate. 



Both ambulacral and interradial plates closely covered with small 

 scrobiculate tubercles of uniform size and disposition, except in the 

 middle of the actinal surface, where they become a little larger and 

 much more scattered : fine miliary granulation between the tubercles. 



Apical system small, very excentric in front : a large central mad- 

 reporite extending from the right anterior basal : four genital pores. 



Peristome situated in the middle of a distinct hollow, excentric in 

 front, transverse, pentagonal, with a distinct floscelle. 



Periproct in posteiior inter-radium, large, elliptical, transverse, 

 immediately iuframarginal, with a valvular operculum formed of three 

 large tuberculated plates. 



Colour, yellowish green. 



Bay of Bengal, 11 fathoms. 



At first sight this species has a strong resemblance to Echinolampas 

 spheroid alis, dArch and Haime, from the Miocene of Sind and Kuchh ; 

 from which it is distinguished at once by the concavity of the actinal 

 surface and by the tumid peristomial margin. The test is also higher 

 in the present species. 



Family Spatangidae. 



Brissopsis, Ag. 



2. Brissopsis Oldhami, n. sp., PI. VIII. figs. 7 and 8. 



Test thin, inflated, ovoid, with a faint anterior groove and a strong 

 posterior truncation; abactinally covered with recurved hair-like spines 

 which are largest and densest within the peripetalous fasciole; acti- 

 nally with similar large spines in the interradii, the ambulacra being 

 almost naked. 



All the ambulacra are abactinally petaloid and sunken : in the 



