100 HOLOSPIRA, SUBG. COELOSTEMMA. 



Length 19, greatest diam. (above) 5.6, diam. of penult, 

 whorl 5 mm. ; whorls 19%. 



Length 18.6, greatest diam. (above) 5.3, diam. of penult, 

 whorl 5 mm. ; whorls 20%. 



Length 15.4, greatest diam. (above) 5.7, diam. of penult, 

 whorl 4.8 mm. ; whorls 17%. 



Length 15, greatest diam. (above) 5.3, diam. of penult, 

 whorl 5.3 mm. ; whorls 17. 



State of Guerrero, Mexico: Amula, between Chalapa and 

 Tixtla (H. H. Smith). 



Holospira elizabetha* PILS., Proc. Acad. Nat. Sci. Phila., 

 1889, p. 81, pi. 3, f. 1-5. CROSSE, Journ. de Conchyl., 1892, 

 p. 272, pi. 5, f. 6, 6 a. v. MARTENS, Biologia, Moll., p. 635. 

 Holospira claviformis v. MARTENS, Biologia Moll., p. 277, pi. 

 16, f. 10-16 (December, 1897). 



This species varies from a nearly cylindrical to a club-like 

 shape, and from short to lengthened. Occasionally the upper 

 part is swollen and bulbous, as in fig. 7 (above fig. 8). The 

 shape of the internal column varies with that of the shell, but 

 it seems always to be at least a little wider above. Thus in 

 two specimens the measurements of shell and axis are as 

 follows : 



Length 17%, diam. above, shell 6.3, axis 3.1; diam. in 

 penult, whorl, shell 5.5, axis 1.8 mm. 



Length 18, diam. above, shell 5.2, axis 2.5 ; diam. in penult, 

 whorl, shell 5, axis 1.8 mm. 



The terminal cone is short and well defined from the cylin- 

 drical portion. One of the original specimens has built out 

 a second peristome on the face of the last whorl, at a right 

 angle to the normal one, in consequence of a hole accidentally 

 broken there. 



H. elizabetha and H. claviformis were described from spec- 

 imens out of the same lot. Mr. Smith showed me a half pint 

 or more of them, on his return from Mexico in 1888. 



23. H. DALLI Pilsbry, n. sp. PI. 26, figs. 28, 29, 30, 31. 



Shell narrowly umbilicate, barrel-shaped, widest below the 

 middle, slowly tapering both downwards and upwards, then 



