FORAMTNIFERA OF NORTH PACIFIC OCEAN. 3 



Subfamily 1. ILAG-ENHSTJE. 



Test consisting of a single chamber, the aperture either ecto- or 

 entosolenian. 



This subfamily includes the single genus Lagena. 



Genus LAGENA Walker and Boys, 1784. 



Lagena Walker and Boys (type, L. globosa (Montagu)), Test. Min., 1784, p. 3. — H. 

 B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 440. 



Description. — Test monothalamous, smooth or ornamented, gen- 

 erally flask-shaped, aperture ecto- or entosolenian. 



The genus Lagena is one of the largest in point of view of numbers 

 of described species and varieties of any of the genera of the Fora- 

 minifera. The opinion as to the limits of variation in the group 

 varies with nearly every student of the group. In the material I 

 have examined I have again and again been made aware of the simi- 

 larity, even the almost identical character of ornamentation in speci- 

 mens from widely separated stations, but usually in the same faunal 

 area. Then, too, there must be recognized a considerable amount of 

 variation in the group as well. The whole problem of Lagena is a 

 very puzzling one, but the greater the amount of material from a 

 given area the more definite these limits of variation seem. With a 

 large series of specimens from a given faunal area it would seem that 

 the limits of variation might be rather definitely fixed and a more 

 orderly system brought out of the present somewhat chaotic condition. 



In describing the various species and varieties oi Lagena a general 

 scheme has been adopted of keeping those species together which 

 have similarities of ornamentation. In this way they may be most 

 easily grouped, and this has been the method usually followed by 

 previous writers. 



On the basis of the aperture various names have been used in a 

 generic sense, such as Entosolenia, Fissurina, PMalina, and so on, 

 and on the basis of form many others have been used. The value of 

 these groupings can only be tested by the study of large series as has 

 already been suggested. 



I have not tried to make the synonymy in an} 7 sense complete, as the 

 whole literature in regard to the genus is in such a chaotic state. The 

 following species and varieties have been recognized from the North 

 Pacific : 



LAGENA GLOBOSA (Montagu). 

 Plate 4, fig. 2. 



"Serpula (Lagena) laevis globosa" Walker and Boys, Test. Min., 1784, p. 3, 



pi. 1, fig. 8. 

 Vermiculum globosum Montagu, Test. Brit., 1803, p. 523. 

 Lagena globosa Brown, Illus. Rec. Conch. Great Britain and Ireland, ed. 1, 



1827, pi. 1, fig. 37; ed. 2, 1884, p. 126, pi. 56, fig. 37.— Reuss, Sitz. kais. 



Akad. Wiss. Wien, vol. 46, pt. 1, 1862 (1863), p. 318, pi. 1, figs. 1-3; Bull. 



