142 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



in the center of the periphery of the last-formed chamber; sur- 

 face of test smooth and imornamented ; wall translucent, thin. 



Length 0.5-2 mm. 



Description. — Type-specimen (U.S.N.M. Cat. No. 17526) from 

 Albatross station D2205, in 1073 fathoms (1962 meters), off the 

 northeastern coast of the United States. The only Challenger record 

 for this species is off New York in 1,240 fathoms (2,268 meters). 

 Flint has also recorded it in the same general area from t^o Alba- 

 tross stations, D2530 and D2584, in 956 and 541 fathoms (1,748 and 

 989 meters). I have had it from numerous stations, most of them 

 in the general latitude of New York, but one off Cape Hatteras, 

 depths ranging from 168-1,362 fathoms (307-2,491 meters). There 

 is a development of this species in the Indo-Pacific region, Brady 

 giving the following Challenger stations: Near the Ki Islands at 

 depths of 129 and 580 fathoms (236 and 1,061 metei-s) ; off Kaine 

 Island, Torres Strait, 155 fathoms (283 meters) ; and off the west 

 coast of New Zealand, 275 fathoms (503 meters). He also gives 

 another station off the Cape of Good Hope, 150 fathoms (274 

 meters). I have had what seems to be identical material from 

 Albatross station D5123, east coast of Mindoro, Philippine Islands, 

 in 283 fathoms (517 meters), and from D5652, in the Gulf of Boni, 

 Philippine Islands, in 525 fathoms (927 meters). This therefore 

 seems to be another one of those species which occurs at consider- 

 able depths, both in the Western Atlantic and the Indo-Pacific. 

 Heron- Allen and Earland have recorded a single imperfect specimen, 

 fossil, from a clay which occurred in the shore sands of Selsey Bill. 

 Sussex, England." Bagg has recorded it as abundant from the Plio- 

 cene at San Pedro, California," but his figures show very conclu- 

 sively that it is an entirely different species from this. It is a small, 

 delicate species, and very apt to be broken. 



Frondicularia advena — material examined. 



« Journ. Roy. Micr. Soc, 1907, p. 427. 



" Bull. 513, U. S. Geol. Survey, 1912, p. 60, pL 18, figs. 1 a-^, 2 a-e. 



