226 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



This species is named for Dr. Fred von Lohr, who accompanied 

 Dr. W. M. Gabb on an expedition to Lower California, during the 

 pioneer work on the geology of western North America. 



Elephantanellum heptagonum Carpenter 

 Plate 20, Fig. 9 



Caecum heptagonum Carpenter, Mazatlan Catalogue, [1855-] 1857, 

 p. 319. "Mazatlan." 



Carpenter's brief description from a fragment collected at Mazat- 

 lan, Mexico, "containing a perfect mouth," seems to be unmistakable. 

 A description of the entire shell follows. 



Shell consisting of a minute, brownish, moderately curved, slightly 

 tapering, seven-sided tube, concave between the slightly raised longi- 

 tudinal ridges at the angles; both ridges and interspaces cut by 32 nar- 

 row, annular grooves, giving the angles a nodulous appearance; the 

 3 anterior rings on an expanded area separated from the balance of the 

 tube by a shallow sulcus ; the end of the tube beyond the last annular 

 groove contracted, forming a seven-sided face surrounding the aperture; 

 aperture circular, set at a slight angle to the axis of the tube, the 

 expanded area being narrower on the concave than on the convex side 

 of the tube; posterior end of the tube closed by a plug encircled by a 

 narrow rim; from the edge of the plug near the concave side of the 

 tube a sharp, nearly straight, triangular spur rises well above the rim. 

 The specimen figured measures: length, 1.8 mm; diameter of tube, 

 0.4 mm. 



Hypotype: No. 722 (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. Twenty-one additional specimens 

 were dredged at the same locality and 3 specimens were dredged off 

 Taboga Island, Panama. 



This species is entirely distinct from any other described from 

 western North America. 



In addition to the species in this family listed and described in this 

 paper, the Academy's collection contains 3 lots, one of a single specimen 

 dredged off Taboga Island, a second of 20 specimens from the same 

 place, and the third of 3 specimens dredged in Bahia Honda. The 

 specimens in the first two of these lots are badly worn, while the third 

 probably represents young stages. It is not considered advisable to 

 attempt to identify or describe these. 



