176 A. Alcock — Account of the Deep Sea Collection. [No. 4, 



ridges with niinute distant granulation, the interporiferous space is 

 broad and bears several series of granules. Beyond the petals the 

 postero-lateral ambulacra increase greatly, while the antero-lateral de- 

 crease somewhat in width. 



Inter-radii very large and broad abactinally where the antero- 

 lateral bear each a small patch, and the postero-lateral each a much 

 larger patch, of large deeply scrobiculate pei'forated tubercles, each 

 surmounted by a long slender recurved recumbent hollow spine. Simi- 

 lar but smaller tubercles, with similar spines, cover the actinal surface 

 rather more densely throughout almost the whole of the broad antero- 

 lateral and postero-lateral inter-radii, and also occur in two small 

 patches, involving both ambulacral and posterior inter-radial plates, in 

 each wing of the sub-anal fasciole. 



Peristome situated immediately behind the anterior cleft, semilunar 

 in shape, and followed by a long narrow labrura. 



Apical system hardly excentric ; the madreporite in the posterior 

 basal. 



Periproct in the upper part of the posterior truncation, large, 

 transversely oval, not sunken. 



The internal fasciole is remarkable in not crossing the anterior 

 ambulacrum ; after skirting the groove in rather more than half of its 

 extent, it gradually fades away on either side, sometimes bending 

 slightly towards the groove, as if to cross, sometimes not. The subanal 

 fascicle is large and dumb-bell shaped, and encloses three pairs of pores 

 on either side. 



Colours : brownish green, spines white. 



Bay of Bengal, 475 fathoms, bottom brown ooze, bottom tempera- 

 ture 45-5° Fahr. 



MOLLUSC A. 



The Mollusca that we may now regard as characteristic of the 

 huudred-fathom line in the Bay, were again met with in considei'able 

 numbers, namely, Tlostellaria delicatula, Nevill, Sigaretus sp., Tellina sp., 

 and Nucula sp. At about the same depth (128 fathoms) there were 

 dredged Phos sp., Pleurotoma sp. prox. atractoides, Watson, and Tellina 

 sp. prox. Murrayi, E. A. Smith, and on the coral bank, at 88 fathoms, 

 Murex 'palmar osse, Lmk. 



ARTHROPODA. 



CRUSTACEA. 



DECAPODA. 



At 128 fathoms the Penosid (1.) Solettocera Uextii, Wood-Mason, 

 characteristic of that depth here, was dredged. 



