WEST AMERICAN PYRAMIDELLID MOLLUSKS. 



93 



The specimen fifjiired is from Todos Santos Bay, Lower California, 

 has 9 post-nuclear whorls and measures: Length 6.5 mm., diameter 

 1.9 mm. Figures 12 and 12a represent the forms described by 

 Carpenter as crehrifilata and figures 14 and 14a that named suhcus- 

 fidata by the same author. Figure 3 shows an extreme variant. 



We have examined the following specimens: 



U.S.N.M. 

 cat. no. 



32245 

 16267a 

 162637 



151724 

 152198 

 191547 

 160480 

 196227 



196226 



206873 



192228 

 122318 

 153065 

 46504 



60933 

 160481 

 206874 



206875 

 157204a 

 105585 

 106510 

 32284 



No. of 

 speci- 

 men. 



Locality. 



Collector. 



Disposition of 

 material. 



2 



al 



1 



2 

 7 

 1 

 1 

 428 

 25 

 1 

 1 

 1 

 1 

 1 



3 



2 

 4 

 hi 

 3 

 2 

 5 

 1 



Monterey, California I Carpenter 



Santa Barbara, California Col. Jewett 



Santa Barbara Islands, California i 



Arcli Beach, California ' 



San Pedro, California } E. W. Roper 



do Mrs. Johnston... 



do i F. L. Button.... 



do 



do ' Mrs. Oldroyd 



do I do 



San Pedro (Wliite's Point), California, i do 



do do 



Off Catalina Island, California l 



Pacific Beach, San Diego, California. . j 



do In. Hemphill. . . . 



Ocean Beach, San Diego, California. . . ! F. W. Kelsey . . . 



do do 



San Diego, California 1 R. E. C. Stearns. 



do Delos Arnold 



do ' 



.do I J. G. Cooper 



.do H. Hemphill 



.do C. R. Orcutt.... 



.do ! 



U. S. Bureau Fisheries station 3566 

 off San Diego, California. Three 

 fathoms. 



San Diego, California 



do 



Point Abreojos, Lower California H. Hemphill 



do do 



Todos Santos Bay, California K . E . C. Stearns . 



U. S. Nat. Mus. 



Do. 



Do. 

 Univ. Cal. 

 U. S. Nat. Mus. 



Do. 



Do. 



Do. 



Do. 

 Oldrovd coll. 

 U. S. Nat. Mus. 

 Oldroyd coll. 

 U. S. Nat. Mus. 

 Univ. Cal. coll. 

 Oldrovd coll. 

 U.S. Nat. Mus. 



Do. 



Do. 



Do. 

 Univ. Cal. coll 



Do. 

 U. S. Nat. Mus. 



Do. 

 Do. 

 Do. 



Do. 

 Do. 

 Do. 

 Do. 

 Do. 



a Figured. 



6 Figured type of Turbonilla tenuicula subcuspidata. 



c Figured crebrifilala. 



TURBONILLA (PYRGISCUS) VIRGO Carpenter. 



Plate 8, figs. 4, 4a. 



Chemnitzia virgo Carpenter, Ann. Mag. Nat. Hist., 3d ser., vol. 15, 1865, p. 396. 



Shell elongate-conic, milk-white. Nuclear whorls small, two, form- 

 ing a depressed helicoid spire, the axis of which is almost at right 

 angles to that of the succeeding turns, in the first of which it is about 

 one-fourth immersed. Post-nuclear whorls moderately rounded, 

 slightly shouldered at t]\e summit, weakly contracted at the peripher}", 

 ornamented by slender, sinuous protractive axial ribs, of which 24 

 occur upon the first and second, 22 upon the third, 20 upon the fourth 

 to sixth, 22 upon the seventh and penultimate turn. Intercostal 

 spaces about one and one-half times as wide as the ribs, well impressed, 

 marked by six strongly impressed series of pits which extend up on 



