Indian Deep-sea Dredging. 441 



The same Sjjecies was dredged in the Bay of Bengal at 

 1590 fathoms in the year 1888. 



Family Temnopleuridae (?). 



Prionechinus, a. Agassiz. 



4. Prioiiechinus Agassizii^ sp. n. 



This species differs from Prionechinus sagittiger in the 

 following particulars : — The test is thick ; there are five com- 

 plete pairs of buccal tentacles ; and the ambulacral plates 

 have three pairs of pores and one primary tubercle to each 

 plate. The pairs of pores are in one simple vertical series in 

 triplets concentric with their tubercle, so as to be slightly wavy, 

 especially below the ambitus, where in the region of the acti- 

 nostome they are very distinctly zigzag. 



Both amlDulacra and interambulacra are made up of two 

 rows of simple plates, those of the ambulacra being of the 

 same height, but only between one half and one third the 

 breadth of those of the interambulacra. 



The median interambulacral grooves and the slightly 

 depressed poriferous zones divide the test into segments like 

 those of a peeled orange. 



Diameter of test 13*8 millim., of actinostome 6'5 millim., of 

 periproct 3 millim. 



From Station 111, 1644 fathoms. 



Two fine specimens were dredged in the Bay of Bengal, at 

 1840 fathoms, in the year 1888. 



Order SPATANGOIDA. 



Family Spatangidas. 



HOMOLAMPAS, A. Agassiz. 



5. Homolampas glauca^ sp. n. (PI. XVII.) 



Differs from Homolampas fidva, A. Agassiz, (1) in being 

 more depressed, (2) in having the posterior end of the test 

 truncate and unnotched, and (3) in the narrower ventral 

 plastron. 



Colour in the fresh state brownish green. 



Four specimens from Station 111, 1644 fathoms, the 

 largest measuring 93 millim. in length. 



