92 BiTLLvrriN 104, united states national museum. 



older specimens somewhat thickened, white, and nearly opaque; 

 aperture a comma-shaped slit in a slight depression of the inner 

 face of the chamber, often with a slightly raised border. 



Length usually from 0.50-0.75 mm., occasionally reaching 0.1 mm. 

 in length. 



Distrihvtion. — In the Albatross material examined the species is 

 often abundant, south from the latitude of Cape Cod, and as far as 

 the coast of South Carolina. Similar specimens occur in the northern 

 part of the Gulf of Mexico and off Key West, Florida. In the Challenger 

 collection Brady records it from off the eastern coast of the United 

 States and off the West Indies. From the eastern part of the Atlantic 

 it is known from numerous stations off the British Isles, from the 

 coasts of Norway, Sweden, and Spitzbergen in 50-270 meters (27- 

 147 fathoms) (Goes). Heron- Allen and Earland record it from 23 

 stations in the Clare Island region, and from 24 stations off western 

 vScotland. Specimens are recorded from 3 stations off the Abrohlos 

 Bank in 40-260 fathoms (73-476 meters) (H. B. Brady, Parker, a-nd 

 Jones). 



The species is recorded from various parts of the world, but the 

 material that I have seen elsewhere than in the Atlantic is not typical 

 in all respects. The North Atlantic material has a definite angular 

 character, the chambers with the edges of the adjacent chambers 

 forming a peculiar oblique angled appearance. This is not shown in 

 Brady's figures of the Challenger Report, but I have tried to illustrate 

 it in the accompanying figures. There is also a considerable difference 

 in the margins of the chambers, the type figures of Brady showing 

 very long spines, a condition which is also shown in some of Goes's 

 fis:ures, but in the material from the western Atlantic and in that I 

 have seen from off the British Isles the specimens seem to have very 

 short spines. 



The specimens I have recorded from off New Zealand are much 

 shorter and more rapidly developed than are the specimens from the 

 western Atlantic. That may be that the material from the South 

 Pacific is of a different species. This might seem more probable 

 in that the Albatross records are mostly from cold water, very few 

 of them being in the Gulf of Mexic(j. A great majority are in the 

 cold water off the New England coast. 



