1893.] A. Alcock — Account of the Deep Sea Collection. 175 



anterior petal, which is the longest and narrowest, the pores are small 

 and extremely evenly and closely set, in the other petals the pores are 

 large : beyond the petals the ambnlacra are only slightly spiniferons 

 at the ambitus, and are almost or quite naked actinally ; and all have 

 small and distant pores ; but abactinally the plates of the postero- 

 lateral ambulacra are spiniferous, and the pores of those that are en- 

 closed in the sub-anal fasciole are exceptionally large. Abactinally, as 

 actinally, the inter-radii are very large, with big broad plates that are 

 finely and closely granular abactinally and much more coarsely and dis- 

 tantly granular actinally. 



Peristome reniform : the orifice of the mouth is made valvular by 

 the remarkable prolongation forwards of the labrum. 



Apical system hardly excentric ; the madreporite is large, passing 

 backwards from the right anterior basal and separating the posterior 

 basals and radials and several inter-radial plates ; four large genital 

 pores. 



Periproct small, vertically pyriform, high up in the posterior 

 truncation, with many plates, of which those at the circumference are 

 the largest. 



The peripetalous fasciole is very distinct, being broadest poste- 

 riorly. Sub-anal fasciole reniform, largely actinal in position, being far 

 distant from the periproct. Two narrow and inconspicuous fasciolar 

 bands extend up from the sub-anal fasciole, one on each side, to the level 

 of the periproct and are then gradually lost. 



The pedicels of the anterior petal are of conspicuous length. 



Colour, dull olive-green ; fascioles dull madder brown. 



Bay of Bengal, 753 fathoms, bottom soft mud; bottom tempera- 

 ture 41 "2° fahr. t 



Lovenia, Ag. and Desor. 



3. Lovenia gregalis, n. sp., PI. VIII. fig. 9. 



Test thin, broad, flat, cordiform, grooved and deeply excised an- 

 teriorly, broadly truncate posteriorly, the ambital margin in front sharp, 

 behind gently rounded. Spinature scanty. 



Anterior ambulacrum in the groove, with pores small and incon- 

 spicuous except at the peristome, where they are larger : it is practi- 

 cally unmodified throughout its course, from apex to peristome. Late- 

 ral petaloid ambulacra with pores almost invisible to the naked eye 

 within the internal fasciole : beyond the internal fasciole the antero- 

 lateral petals are markedly divergent from, while the postero-lateral 

 petals are convergent towards, the sagittal line : the slightly sunken 

 pairs of pores are large and are separated from one another by faint 



