NO. 12 STRONG AND HERTLEIN : MARINE MOLLUSKS 219 



postnuclear whorl a slender spiral cord appears on the middle of the 

 shoulder; on the third whorl still another cord appears at the summit 

 of the whorl; on the fourth whorl there are 4 spiral cords on the 

 shoulder and another between the 2 major spiral cords, while on the 

 penultimate whorl there are 7 nearly equal spiral cords ; axial sculpture 

 of slender, more or less curved ribs, of which about 30 appear on the 

 penultimate whorl; periphery of the last whorl marked by a sulcus; 

 base well rounded, marked with 5 equally spaced spiral cords which 

 grow gradually weaker toward the umbilical region; aperture nearly 

 circular, outer lip thin; columella curved, slender, body with a very 

 thin callus. The type measures: length, 2.8 mm; diameter, 1.0 mm. 

 Among the paratypes there is considerable difference in the sculpture 

 on the last whorl, some being almost smooth. 



Holotype: No. 699 (Calif. Acad. Sci. Paleo. Type Coll.), from 

 Loc. 27,229 (C.A.S.), dredged in from 3 to 9 fms. in Bahia Honda, 

 Panama. L. G. Hertlein collector. About 400 additional specimens were 

 dredged at the same locality; 17 specimens off Taboga Island, Panama. 



The sculpture of this species is quite similar to that of Alabina 

 dioinedeae Bartsch,'*'^ described from the Gulf of California, but it is 

 a much smaller and proportionately broader shell. 



This species is named for the state of Veragua of the Republic of 

 Panama. 



Caecum bahiahondaense Strong & Hertlein, new species 



Plate 20, Fig. 10 



Shell consisting of a minute, moderately curved, opaque, white tube 

 of nearly uniform diameter; sculptured with 18 strong, rounded ele- 

 vated rings, separated by rounded grooves a little wider than the rings; 

 aperture sharp edged, circular, separated from the last ring by a narrow, 

 contracted, flat area, which is about twice as wide on the convex as on 

 the concave side of the tube, causing the aperture to be set at a slight 

 angle to the axis of the tube ; posterior end of the tube contracted, closed 

 by a plug which is encircled by a narrow, raised rim; from the center 

 of the plug a spur rises toward the convex side of the tube, ending in a 

 rounded point just inside the line of the rim. The type measures: 

 length, 1.9 mm; diameter of tube, 0.5 mm. 



^^ Alahina diomedcae Bartsch, Proc. U. S. Nat. Mus., vol. 39, January 13, 

 1911, p. 413, pi. 62, fig. 1. Type dredged "in 26^ fathoms, on broken shell bottom 

 off Cacachitas, Gulf of California." 



