CHILOSTOMELLIDAE 107 



The depths range between 18 and 346 m., the latter depth being at WS 28, where the 

 species is frequent and well developed. This range has only been extended by the 

 finding of a single fragmentary specimen at St. 157 in 970 m., to which we should not 

 attach any importance as its presence may be accidental. The species is most at home in 

 shallower water, the best stations being Sts. 30, 45, 123, 126, 149, 660, WS 25, 42 and 

 154, with an average depth of about 190 m. Megalospheric and microspheric forms 

 were found together at twenty-five stations, including the nine just mentioned. At the 

 other stations megalospheric individuals only were observed. There appears to be great 

 range in the size of the megalospheric proloculum; exceptionally large primordial 

 chambers were seen in specimens obtained from St. 27 and WS 66. 



The texture of the shell is normally smooth and glossy, becoming smooth but dull 

 with age. After death the secondary deposit of shell substance appears to disintegrate 

 rather quickly, leaving a roughened surface. This is quite distinct from a superficial 

 roughening due to the formation of minute beads or spines or striae, a variation which 

 appears to be rather rare, having been observed only at MS 68, WS 25, 27, 33, 37, 66 

 and 349. At MS 68 nearly all the specimens were coated with a thin layer of fine mud, 

 so that the nature could only be guessed at from the characteristic shape of the mud 

 lumps. The coating was readily dislodged and its nature is obscure ; it appears to be too 

 thin to be regarded as encystment. 



194. Ehrenbergina bradyi, Cushman (F 166). 

 Two stations: WS 521, 522. 



A few small individuals at WS 521 and 522. Both the stations are in deep water. 



Family CHILOSTOMELLIDAE 

 Genus Seabrookia, Brady, 1890 



195. Seabrookia earlandi, J. Wright (F 168). 

 One station : WS 429. 



Rare, but a good many specimens were found at this station at a depth of 2549 m. 



Family LAGENIDAE 



Sub-family LAGENINAE 



Genus Lagena, Walker and Boys, 1784 



Owing to the number of species recorded, they have been placed in alphabetical 

 order for facility of reference. 



196. Lagena acuta (Reuss) (F 211). 



Eighteen stations: 20, 30, 126, 144, 149; WS 25, 28, 33, 42, 46, 48, 63-4, 66, 113, 154, 349, 521 ; 

 MS 14. 



