30 BULLETIN fiS, UNITED STATES NATIONAf. MUSEUM. 



extend to the uinbilical region. Outer lip fractured; aperture? col- 

 umella very strong, somewhat curved and revolute, provided with a 

 subobsolete oblique fold. 



The type and another specimen (Cat. no. 163009, U.S.N.M.) were 

 collected by Mr. H. Hemphill at San Diego, California. The type has 

 eight post-nuclear whorls, and measures: Length 3.3 mm., diameter 

 1.1 mm. 



Two other lots belonging t(^ the University of California have been 

 examined — one, a single specimen, comes from station 30 off Catalina 

 Island. The other three specimens were obtained at station 47, San 

 Diego, California. 



TURBONILLA (TURBONILLA) GILLI DELMONTENSIS Dall and Bartsch. 



Plate 2, fig. 12. 



Turhonilla (Turhonillu) gilU del.inontens's Dall and Bartsch, Proc. U. S. Nat. 

 Mils., vol. 33, 1907, p. 494, pi. 14, fig. 7. 



Shell, similar to T. gilli, but much more stout and less turrited, with 

 the ribs less strongly developed and the peripheral thickening only 

 weakly represented. The type has lost the nuclear whorls, the eight 

 remaining measure: Length 3.4 mm., diameter 1.2 mm. 



Tifpe.— Cat. no. 195921, U.S.N.M. was collected by Mr. S. S. 

 Berry in 12 fathoms off Del Monte, Monterey, California. 



TURBONILLA (TURBONILLA) CENTROTA, new name. 



Plate 2, figs. (), iki. 



^=Chemnitzia acuminata C. B. Adams, Ann. Lye. Nat. Hist, of N. Y., 1853, p. 388. 



=^Chrysallida acuminata C. B. Adams, Proc. Zool. Soc, 1863, p. 351. Not Turho- 

 nilla acuminata Goldfuss, = Turritella acuminata Goldfuss, 1852; nor Chem- 

 nitzia acuminata Keyserling 1846 (not a Turhonilla). 



Shell very broadly conic, tabulatedly shouldered, milk-white. 

 Nuclear whorls two and one-half, forming a decidedly elevated spire, 

 the axis of which is at right angles to that of the succeeding turns, 

 in the first of which it is slightly immersed. Post-nuclear whorls 

 with decidedly tabulated summits, constricted at the sutures, well 

 rounded, ornamented by strong, narrow, protractive axial ribs. Of 

 these ribs 14 occur upon the first, 16 upon the second and third, 18 

 upon the fourth and fifth, and 20 upon the penultimate turn. Inter- 

 costal spaces a little more than twice as wide as the ribs, well im- 

 pressed, terminating at the periphery. Sutures very strongly marked. 

 Periphery and base of the last whorl well rounded, marked by the 

 continuations of the axial ribs. Aperture oval ; posterior angle acute ; 

 outer lip tliin, showing the external sculpture witliin; columella 

 slender, somewhat curved and slightly revolute. 



The specimen described is C. B. Adams's type and is registered as 

 number 219 Amherst College. It is a mature specimen of seven 

 post-nuclear whorls and measures: Length 2.8 mm., diameter 1.1 mm. 



It was collected at Panama. 



