218 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.2 



3 tuberculate cords, of which one is at the summit, one a little above 

 the suture, and the third about half way between the other two; axial 

 sculpture of slightly less strong, moderately protractive ribs which con- 

 nect the tubercles of the spiral cords and extend into the sutures: of 

 these, 18 appear on the early whorls, gradually increasing to 24 on the 

 penultimate whorl; the tubercles at the junction of the axial ribs and 

 spiral cords more or less truncated on the posterior face, particularly 

 those on the lower spiral cord ; the space enclosed by the axial ribs and 

 spiral cords forming well impressed, squarish pits; peripheiy of the last 

 whorl marked by a sulcus about as wide as that between the spiral cords 

 and like them crossed by the ends of the axial ribs; base short, marked 

 by 2 spiral cords, one of which bounds the peripheral sulcus and the 

 other a slender, raised thread encircling the columella, the space between 

 them being slightly concave; aperture nearly circular, strongly channeled 

 anteriorly, outer lip broken in the type; columella curved, twisted. The 

 type measures: length, 3.2 mm; diameter, 1.2 mm. 



Holotype: No. 712 (Calif. Acad. Sci. Paleo. Type Coll.), from 

 Loc. 27,257 (C.A.S.), collected on the rocks below the Delessep Monu- 

 ment at Panama City, Panama. L. G. Hertlein collector. A second 

 specimen was collected at the same locality. In addition to these, 31 

 specimens were dredged in Bahia Honda and 5 specimens were dredged 

 off Taboga Island, Panama. 



In Bartsch's key to the west coast species in the genus Cerithiopsis,'^^ 

 this would follow infrequens, also described from Panama. It differs 

 from that species principally in the more numerous axial ribs and dif- 

 ferent arrangement of basal cords. It is also larger for the same number 

 of whorls. 



This species is named for Montezuma, the Chief of the Aztec 

 Indians, in Mexico City, at the time of the arrival of Cortez. 



Alabina veraguaensis Strong & Hertlein, new species 



Plate 19, Fig. 15 



Shell minute, elongate-conic, pale brownish ; nuclear whorls 3, yel- 

 lowish, rounded, smooth; postnuclear whorls 3, with an indistinct, slop- 

 ing shoulder reaching from a little below the middle to the summit, 

 lower part rounded ; major spiral sculpture consisting of 2 spiral cords, 

 one on the middle of the whorl bounding the sloping shoulder, and the 

 other halfway between it and the base of the whorl; on the second 



46Bartsch, P., Proc. U. S. Nat. Mus., vol. 40, May 8, 1911, pp. 330, 331. 



