344 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 40." 



with a thick callus which connects the columella with the posterior 

 angle of the aperture. 



The specimen described and figured (Cat. No. 211566, U.S.N .M.) 

 is one collected by Prof. C. B. Adams at Panama. It has eight post- 

 nuclear whorls and measures: Length 3.2 mm., diameter 1.1mm. 



CERITHIOPSIS (CERITHIOPSIS) HALIA, new species. 

 Plate 40, fig. 8. 



Shell small, broadly elongate-conic, chocolate brown. (Early 

 nuclear whorls decollated.) Only the last volution remains, which 

 is smooth. Post-nuclear whorls strongly shouldered at the summit 

 on the early whorls, ornamented with three spiral cords, of which the 

 first, at the summit, is very poorly developed; the second is situated 

 at the posterior termination of the anterior third between the sutures; 

 while the third, which equals the second, is about halfway between 

 this and the suture. In addition to the spiral cords, the whorls are 

 marked by decidedly retractive, axial ribs which are almost equal 

 to the spiral cords in strength. Of these ribs, 12 occur upon the first, 

 14 upon the second, 16 upon the third and fourth, 18 upon the fifth, 

 and 20 upon the penultimate turn. The intersections of the axial 

 ribs and spiral cords form well-rounded tubercles, while the spaces 

 inclosed by them are elongated pits between the first and second 

 spiral cord, and large, squarish pits between the second and third. 

 Periphery of the last whorl marked by a sulcus not quite as broad 

 as that which separates the supraperipheral from the median cord, 

 and crossed by the continuations of the axial ribs. Base short, con- 

 cave, marked by two spiral cords immediately below the peripheral 

 sulcus and by numerous fine, incremental lines. Aperture subquad- 

 rate, decidedly channeled anteriorly; posterior angle obtuse; outer 

 lip rendered sinuous at the edge by the external sculpture which 

 is apparent in the aperture; columella short, curved, and twisted, 

 with the free edge reflected; parietal wall glazed with a thin callus. 



We have seen three specimens of this species, none of them quite 

 mature. Cat. No. 32399, U.S.N.M., contains the type and another 

 specimen from Todos Santos Bay, Lower California. The type has 

 eight post-nuclear whorls and measures: Length 4.5 mm., diameter 

 2.1 mm. The third specimen (Cat. No. 16196, U.S.N.M.) comes from 

 Cape San Lucas, Lower California. 



CERITHIOPSIS (CERITHIOPSIS) AUREA, new species. 

 Plate 40, fig. 1. 



Shell elongate-conic, bright, light chestnut brown, excepting the 

 extreme apex, which is wax yellow. Early nuclear whorls decol- 

 lated; the last one only remains and is well rounded and smooth. 

 Post-nuclear whorls well rounded, appressed at the summit; marked 



