00 in 104-213 



If 



FORAMINIFERA OF NORTH PACIFIC OCEAN. 97 



some cases the divisions are separated, giving several openings; color 

 variable, usually light gray. 



Length up to 7.5 mm.; diameter up to 2 mm. 



Distribution. — The only published record for this species in the 

 North Pacific is that of Bagg, who recorded it from two Albatross 

 stations in the vicinity of the Hawaiian Islands, D4000 in 104-213 

 fathoms and H4590 in 978 fathoms. I have found 

 specimens in material from Nero station 2071 in 271 

 fathoms, also near the Hawaiian Islands and at Alba- 

 tross station D. 4900 in 139 fathoms off Japan. 



The dendritic aperture is supposed to distinguish 

 this species from any others that may be confused with 140 141 



it, but in the smaller specimens which have not attained FlGS - ho-hi.-ha- 

 adult characters the aperture is simple. The laby- xT^froj/ph" 

 rinthic condition of the interior is also characteristic, tograph. 

 As d'Orbigny's name is the first to be referred to the figure of Sol- 

 dani, priority will make necessary the use of his name dubia instead 

 of soldanii Jones and Parker. 



Subfamily 3. rD^lOCm^lVLlVLINlN JE.. 



Test composed of several chambers, either in a planospiral coil, 

 trochoid, or otherwise arranged, wall composed of sand grains of 

 varying degrees of coarseness cemented with a calcareous or ferru- 

 ginous cement, free or attached. 



This subfamily as here used contains the many-chambered arenace- 

 ous forms not arranged in a linear series throughout. Except the 

 large, somewhat anomalous form, Neusina agassizii, for which a 

 separate subfamily has been made. Some of the species, such as 

 Ammobaculites tenuimargo, appear to be largely made up of a linear 

 series, but have a close coiled early portion not seen in the Reo- 



phacinas. 



TROCHAMMINOIDES, new genus. 



Description. — Test free, typically planospiral, composed of several 

 coils, each constricted into a number of chamber-like portions with 

 the openings between large; wall of fine sand and a yellowish-brown 

 cement; aperture simple at the end of the last-formed chamber. 



Type of the genus. — Trochammina proteus Karrer. 



This species frequently shows a tendency to continue the Ammo- 

 discus condition through one or more of the early coils, and the latter 

 portion only may be divided, or in other specimens the divisions may 

 occur much earlier. By its early development the genus is seen to 

 have been derived from an Ammodiscus condition, as its early devel- 

 opment consists of a proloculum and long coiled chamber as in 

 Ammodiscus, but its later constricted condition foreshadows the con- 

 dition of complete division seen in the chambered coiled forms 

 usually assigned to Haplophragmium and Trochammina. 



16777— Bull. 71—10 7 



