N0.1574. WEST AMEPJCAN PYRAMIDELLID.E-DALL AND BARTSCIL 519 



ODOSTOMIA (lOLAEA) AMIANTA, new species. 

 Plate XLVI, Hi>y. S», S)a. 



Shell broadly conic, yellowish-white. Nucleus small, of two whorls 

 which increase extremely rapidly in size and are obliquely placed. 

 Pustnuclear whorls very strongly shouldered, marked by 3 very 

 strong lamellar spiral keels on the first and second and 4 on the suc- 

 ceedino- whorls between the sutures. The posterior keel marks the 

 limit of the broad, sloping shoulder and is much the strongest. It 

 is also placed a little farther apart from the next spiral keel than that 

 is from its anterior neighbor. Base of the last whorl well rounded; 

 ornamented by 8 spiral ridges, which are less elevated and nuich more 

 closely and regularly spaced than those between the sutures. The 

 peripheral groove is about equal in width to the one anterior to the 

 posterior keel. The entire shell is marked by tin(\ sublamellar, regu- 

 larly spaced, retractive axial ril)s, which render the spiral keels some- 

 what crenulated at their meeting points and bi-eak the spaces between 

 them into small squares or oblongs. These riblets extend from the 

 sutures to the small umbilicus. Aperture subovate, posterior angle 

 obtuse; outer lip thin, somewhat wavy, showing the external sculp- 

 ture within; columella moderately stout, somewhat curved and strongly 

 revolute, having an oblique fold near its insertion which is barely 

 visible when the aperture is viewed squarely; parietal wall covered by 

 a fairl}' thick callus. 



The type and another specimen (Cat. No. 105483, U.S.N.M.) were 

 collected at Point Abreojos, Lower California, by Mr. Henry Hemp- 

 hill. It has (3 post-nuclear whorls and measures: Length tt.-l mm., 

 diameter 2.3 mm. 



Specimens of Odostomiu {lolaen) nmiajita Dnll and Bartsch. 



No. of 

 speci- 

 mens. 



Loealitv. 



Collector. 



Monterey Bay 



Monterey, off Del Monte (12 

 fathoms). 



do 



San Fed ro 



San Pedro. Long Beach 



San Pedro, station 83 



Rev. G. W. Tavlor. 

 S. S. Berry 



W. H. Dall 



Mrs T. S. Oldrovd 



n. x\. Lowe 



Universitv of California. 



Off Catalina Island,. station '_'<S. 



Off Cataliria Island, station 30. 



San Diego, station 47 



do 



do 



Off Coronado Island, 20 fath- 

 oms; bottom temperature 

 ,58°. 



Point Abreojos, Lower Cal . . . 



do 



do 



do 



F. \V. Kelsey 



Henrv Hemphill 



U.S. F.C. station (2932) 



Henr\- Hemphill 



Catalogue No. 



No. 37253 U.S.N M. 



S. S. Berry's collection. 



No. teStiSS U.S.N.M. 

 No. 1GM6.S4 U.S N.M. 

 No. 196298 U.S.N.M. 

 University of California collec- 

 tion. 



Do. 



Do. 



Do. 

 No. 160115 U.S.N.M. 

 No. 105469 U.S.N.M. 

 No. 168685 U.S.N.M. 



No. 105483 U.S.N.M. (l=type). 



