56 



BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



Siphogenerina costata Schlumberger, Feuille Jeun. Nat., ann. 13, p. 118, fig. 13, 

 1883. 



Test elongate, cylindrical or tapering, chambers of the imiserial 

 portion broader than long, surface marked by several rather widely 

 separated, well-developed costae, each extending nearly the length of 

 the test, independent of the sutures; aperture typically with a short 

 tubular neck and well-developed flaring lip. Length, up to nearly 

 2 mm.; breadth, up to 0.55 mm. 



This is the commonest species of the genus in the area. It is more 

 abundant in the shallow-water material from about the various islands, 

 although there are numerous records for it from the Albatross dredg- 



Table 26. — Siphogenerina raphana — material examined 



