Indian Deep-sea Dredging. 451 



hastrum is specifically quite distinct from Flahellum laciniatum. 

 In the latter the calicle is more wedge-shaped, not laterally- 

 compressed in the middle, and less conspicuously pedunculate, 

 and its margin is much more deeply indentated between the 

 septa; the columella is a mere rudiment in the bottom of the 

 calicle, and the lateral costse are much more nearly horizontal 

 and are extremely prominent, forming with their corresponding 

 septa conspicuous lateral wings. The dry corallura, like the 

 living polyp, is of a dark madder-colour. 



Our s))ccimen measures about 2 inches in the major and 

 1*2 in the minor diameter of the caliculav orifice. 



Phylum PORIFERA. 

 Class SILICOSPONGI^. 



In the Andaman Sea, Station 115, 188 to 220 fathoms, 

 proved a harvest-field for Sponges, as for Fishes, Crusta- 

 ceans, and Echinoderms. Here a large number of Hexacti- 

 nellida was obtained, including numerous huge specimens, 

 over two feet in length, of a Semperella^ a large Pheronema, 

 and two species of Iltjalonema. 



The depths of the Bay of Bengal yielded many Hexacti- 

 nellid forms, among which we recognize (1) an Asconematoid 

 forming a thin- walled, shallow, broad-lipped cup, composed 

 of a felt of long spicules, from 1997 fathoms, (2) a fine speci- 

 men of an Aulochone from 1803 fathoms, (3) a small Hgalo- 

 nema from 1997 fathoms, and (4) several species of 

 Euplectellids. 



Grade A. Plastidozoa. 



Class RETICULARIA. 



In such examination as has been made of the ocean-deposit 

 brought up by the sounding-tube and trawl during the season 

 the only notable Foraminifer discovered is a large species of 

 Mormosina, which combines some of the characters of IJorino- 

 sina ovicula, H. B. Brady, with some of those of Honnosina 

 month, H. B. Brady. The test, which is long, slender, and 

 tapering, is composed of numerous subpyriform segments 

 arranged in a straight line in a very close-set diminishing 

 series ; the walls are smooth, thick, and strong, with a com- 

 pact finely arenaceous texture ; colour red-brown. 



The largest fragment measures 8'5 millim. in length. 



