106 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. 



fathoms, but the occurrence in deep water off oceanic islands has been 

 several times referred to. 



In the material which I have examined the species has occurred 

 at several stations off southeastern Japan in the region from which 

 Brady's types came. These stations have depths of from 191 to 

 500 fathoms. It was also found to be frequent off the Philippines, 

 occurring at Nero station 849 in 737 fathoms. 



As is usual in other species the microspheric form occurs less 

 frequently than the megalo spheric and the latter does not attain as 

 large dimensions. The two may be distinguished at a glance as the 

 megalospheric form, which is represented in all of Brady's figures, is 

 bluntly rounded, the early portion being of about the same diameter 

 as the later developed, uniserial portion. In the microspheric form 

 the early portion is more acute and tapering, the test above being 

 contracted at the beginning of the uniserial portion. 



Occasionally specimens of this species show traces of delicate 

 striations. 



One point of particular significance is the fact shown in fig. 5, 

 where it may be seen that in the microspheric form there is a ten- 

 dency toward a spiral development in the earliest chambers. This 

 shows the relationship of this genus to close coiled genera such as 

 CristeUaria and its probable development from a close coiled form. 



The relation of the interior tubular structure to the walls of the 

 test is diagrammatic ally shown in fig. 7. 



In four cases the bottom temperature is given for the stations at 

 which this species has occurred. They are 39.1°, 44.1°, 45.7°, and 

 49.4° F. These are all off the coast of Japan, and as will be seen 

 are rather higher than bottom temperatures run as a rule. This 

 may have a definite bearing on the distribution in this species. 



SIPHOGENERINA DIMORPHA (Parker and Jones). 

 Plate 45, figs. 3, 4. 



Uvigerina (Sagrina) dimorpha Parker and Jones, Philos. Trans., vol. 155, 1865, 



p. 420, pi. 18, fig. 18. 

 Sagrina dimorpha H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 



p. 582, pi. 76, figs. 1-3.— H. B. Brady, Parker, and Jones, Trans. Zool. 



Soc. London, vol. 12, 1888, p. 225, pi. 45, fig. 6— Goes, Kongl. Svensk. 



Vet. Akad. Handl., vol. 25, No. 9, 1894, p. 52, pi. 9, figs. 510, 511.— Bagg, 



Bull. U. S. Nat. Mus., vol. 34, 1908, p. 152. 

 Siphogenerina dimorpha Egger, Abh. kon. bay. Akad. Wiss. Miinchen, CI. n, 



vol. 18, 1893, p. 317, pi. 9, fig. 30. 



Description.— Test nearly cylindrical, elongate, slightly tapering, 

 usually broadest near the apertural end, chambers comparatively 

 few, broader than long, slightly inflated; sutures distinct, usually 

 somewhat excavated at nearly regular intervals, the portions be- 

 tween extended backward and bridging over the suture; walls with 



