442 Messrs. J. Wood-Mason and A. Alcock on 



Class HOLOTHUROIDEA. 



Of Holotliurians veiy numerous specimens of twelve species 

 and nine genera were obtained, and they have in large part 

 been identified by Surgeon 1. H. TuU Walsh, I, M.S., who 

 has given a list of most of the ' Investigator ' deep-sea Holo- 

 thuroidea in the Journ. As. Soc. Beng. vol. Ix. pt. ii., 1891, 

 pp. 197-204, to which we refer for names of species and 

 notices of two new genera. 



In the Andaman Sea Benthodytes appears to live in large 

 colonies at moderate depths ; and besides Benthodytes, Pan- 

 nychia, EupyrguSj and a new type of Deimatida3, according to 

 Mr. Walsh, were found. 



On the Ghhigerina-oozQ of the greater depths of the Bay 

 of Bengal Holotliurians, especially of the bathybial order 

 Elasipoda, seem to find an optimum, and specimens of the 

 following were trawled : — Peniagone (1803 fathoms), Deiina, 

 two species (1644 to 1803 fathoms), Orphnurgas (561 

 fathoms), Euphronides (1803 fathoms), Benthodytes^ two 

 species (1748 to 1803 fathoms), and Apodogaster (561 fathoms), 

 the last being a new genus of the Psychropotidai established 

 by Mr. Walsh. 



In tiie Laccadive Sea numerous Holotliurians were taken 

 between 738 and 1091 fathoms — Deima, Benthodytes^ and 

 Eupyrgus. 



Class OPHIUROIDEA. 



Of this class numerous specimens, of thirteen species and 

 seven genera, were collected. 



In the Andaman infra-littoral down to 400 fathoms, just as 

 in the Andaman littoral zone, brittle-stars have been found to 

 be in this, as in previous seasons, very numerous, especially 

 where the bottom contains many Glohigerina-&\\t\\s and much 

 coral-detritus. A beautiful pink Ophiotlirix is very common 

 here, the swabs often coming up completely encrusted with it. 



In the opener paits of the Bay of Bengal, where, along 

 with increasing depth and distance from land, the bottom 

 comes to be made up largely of the shells of Foraminifera, a 

 good many Ophiuroids were taken, up to the greatest depth 

 in which the trawl was worked. 



In the Andaman Sea, besides the multitude of Ophiothrix, 

 were found Ophioglypha (405 fathoms) and a beautiful species 

 of Ophiernus with disk of deep purple and rays of bright 

 scarlet (683 fathoms). 



