414 PROCEEDINGS OF THE ACADEMY OF [1889. 



I received this species from Mr. John Ford, to whom it was 

 transmitted by Mr. Geo. J. Streator of Garrettsville, Ohio. It was 

 collected on Cayman Island (an islet lying about 200 miles south of 

 Central Cuba) by Mr. Clark P. Streator, whose name I have given 

 the species. 



H. streatori belongs evidently to the section Hemitrochus ; and 

 like the other species of that division the axis is perforated in young 

 shells. There is a general resemblance in form and color-pattern to 

 H. ampleeta but that shell and its allies are umbilicate. Its affinity 

 is greatest with Tryon's H. guassoini, 1 described from the tiny islet 

 of Navassa, but the streatori is more depressed, with more oblique 

 aperture, fewer more rapidly enlarging whorls, etc. These two 

 shells, guassoini and streatori, should be inserted in my monograph 

 of Hemitrochus in the Manual of Conchology immediately following 

 the group of ampleeta, rufoapicata and graminicola (p. 37). It may 

 be noted that with the exception of the last-named form, these 

 two are the only species of Hemitrochus ranging south of Cuba. 

 Helix (Mesodon) kiawaensis Simpson. PI. 12, f. 11, 12. 



The jaw (fig. 11) and dentition of this species are here figured 

 from one of the original specimens. A rhachidian tooth with three 

 adjacent laterals (l.) are figured, with a group of transition teeth 

 (tr.) and three marginal teeth (wi.). The affinities of the species 

 are with H sayi Binn., agreeing with that form in the long penis, 

 and other details of genitalia. 



Note: The following description and figures 6 and 7 of pi. 12 

 have been communicated to me by Dr. V. Sterki, of New Phila- 

 delphia, Ohio. Figures 4 and 5 of the same plate are camera- 

 lucida drawings of a specimen received from Dr. Sterki. 



Pupa holzingeri Sterki. PI. 12, figs. 4, 5, 6, 7. 



Shell narrowly perforated, turreted-cylindrieal, vitreous (or whit- 

 ish), very minutely striate, shining ; apex rather pointed, whorls 5, 

 regularly increasing, well rounded, especially the upper ones, the 

 last somewhat narrowed and a little ascending towards the aperture, 

 compressed at the base but not carinated, at some distance from the 

 outer margin provided with an oblique, rather prominent, acute 

 crest corresponding in direction to the lines of growth, extending 



1 See description and figures from types, Manual of Conchology (Pilsbry's 

 continuation), vol.'v, appendix, p. 197, pi. 63, figs. 14, 15. 



