238 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 





Liotia heimi Strong & Hertlein, new species 



Plate 21, Figs. 4, 7 | 



Shell small, turbinate, solid, white; nuclear whorls 2, small, smooth; 

 postnuclear whorls 3, well rounded, sutures channeled; spiral sculpture 

 on the last whorl of 9 nearly equal and equally spaced cords, of which 

 the upper 3 appear on the spire and the last enters the umbilicus; axial 

 sculpture of raised riblets in the interspaces between the spiral cords; 

 on the spire these riblets are fine and closely spaced, while on the last 

 whorl they form wider spaced bars undulating the cords and pitting 

 the interspaces; periphery of the last whorl and base well rounded, the 

 interspaces between the sixth and seventh and eighth spiral cords very 

 deeply pitted; umbilicus rather small, with an entering groove bounded 

 by the last spiral cord, while the upper part is bounded by the next to 

 the last cord; aperture small, circular, outer lip thick, undulated by 

 the ends of the spiral cords ; inner lip thin where it bounds the umbilicus, 

 spreading above. Operculum unknown. The type measures: diameter, 

 2.0 mm; height, 1.4 mm. 



Holotype: No. 730 (Calif. Acad. Sci. Paleo. Type Coll.), from 

 Loc. 27,228 (C.A.S.), dredged in from 3 to 9 fms. off Taboga Island, 

 Panama. L. G. Hertlein collector. Three additional specimens were 

 dredged at the same locality and 4 specimens were dredged in Bahia 

 Honda, Panama. 



In common with many species in the genus there is some variation in 

 the character and strength of the axial sculpture while the spiral sculp- 

 ture remains very constant. The present species belongs in the group 

 with Liotia acuticostata Carpenter^ ^ and its varieties from southern and 

 Lower California. It differs in the greater number of spiral cords and 

 stronger axial riblets. 



This species is named for Dr. Arnold Heim, Swiss geologist, in 

 recognition of his contributions to the geology of Lower California. 



63 Margarita acuticostata Carpenter, Proc. Calif. Acad. Sci., vol. 3, July, 

 1864, p. 157. "Hab. Santa Barbara, in kelp-root"; "Catalina Island, 8-10 fms."; 

 "Monterey." 



Liotia acuticostata Carpenter, Strong, Trans. San Diego Soc. Nat. Hist., 

 vol. 7, no. 37, 1934, p. 437, pi. 29, figs. 7, 8, 9. Isthmus Cove, Santa Catalina 

 Island, California; Guadalupe Island; Magdalena Bay; Cape San Lucas; Tres 

 Marias Islands, Mexico. Also Carpenter's original records of Monterey and 

 Catalina Island cited. 



