FORAMINIFERA OF NORTH PACIFIC OCEAN. 



69 



Longer diameter of the proloculum 0.5-1 mm. 



Distribution. — The only Challenger record for this species is found 

 in the volume on "Summary of Results." It is there recorded from 

 station 237, 1,875 fathoms, east of Japan. Brady, in the ninth vol- 

 ume of "the Challenger Report," writes that it is a curious fact that 

 he had not met with a single specimen in any of the North Pacific 



Fig. 88.— Ammolagena clavata. X 50. specimen attached, portion of proloculum broken 



AWAY. MICROSPHERE SPECIMEN WITH SMALL PROLOCULUM AND COMPARATIVELY LONG TUBULAR 

 PORTION. 



dredgings. In the Eastern North Pacific Goes has recorded this 

 species from three stations off the coast of Mexico and Central 

 America, (360-1 ,201 fathoms. Bagg records it from six stations in the 

 vicinity of the Hawaiian Islands, 104-978 fathoms. In the present 

 work I have found it from Albatross station D3431 where Goes 

 records it, H2999, 549 fathoms, and Nero 

 station 2032, 1,014 fathoms, both in the vi- 

 cinity of the Hawaiian Islands. 



I have examined Goes' s selected material 

 and also that selected by Bagg, now in the 

 National Museum. 



Besides being attached to pebbles, sand, 

 grains, shells, etc., I have noted its occur- 

 rence on the following genera of Foramini- 

 fera: Ammodiscus, Cyclammina, RJiabdam- 

 mina, Ilaploplvragmium, Biloculina, Pulvi- 

 nulina, and Cristellaria. 



Wright, 1891, speaks of the difference in 

 the length of tube being related to the size 

 of the proloculum, the shorter tube with the 

 larger proloculum, and the reverse. This would indicate a true di- 

 morphism and would correspond to what is known in other groups, 

 that the largest test is usually that with a microspheric proloculum. 



Fig. 89.— Ammolagena clavata. 

 x15. (from photograph). micro- 

 spheric and megalospheric 

 specimens attached side by side. 



