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Turbonilla Risso. 



i. Turbonilla subcylindrica n. sp. PI. XVII, fig. n. 



Stat. 102. 6° 4'. 1 N., i20°44'E. Sulu Sea. 535 M. Fine, yellow sand. 1 Spec. 



Shell rather large, subcylindrical, attenuate towards the spire, white, with a faint 

 yellowish-brown band at the upper part of the whorls, upper whorls more brown. Nuclear 

 whorls bulbous, smooth, abruptly turned to the left, consisting of a little more than one lateral 

 volution; postnuclear whorls about n 1 /», with a deep suture, making the shell subgradate, 

 especially the upper whorls. Sculpture consisting of substraight ribs (about 2 1 on last whorl), 

 which are rather broad and are separated by large interstices, about as broad as the ribs, but 

 not deep ; moreover I see a microsculpture consisting of very fine growth-striae and still finer 

 spiral striae, and traces of a slight contraction in the upper part of each whorl, especially of 

 the upper ones, scarcely appreciable in the lower whorls. Last whorl elongate, rounded below. 

 Aperture oval, with an angle in its upper part, a thin, subsinuous outer margin, and arched 

 columellar margin, with an oblique plait above the middle, and is reflected below. No traces 

 of an umbilical slit. 



Alt. io 1 /*, lat. 2; apert. alt. i 1 /,, lat. 5 / 6 Mill. 



This new species is allied to Turbonilla templaris Melv., but it is much larger, even 

 than a specimen which I owe to the liberality of the author (long 6 1 /,, Mill.) more cylindrical 

 and less contracted at some distance below the suture, moreover that species is uniformly glassy 

 white, whereas the new species is faintly banded. 



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