SESAEA. 243 



tractor muscle is attached to the penis some distance (the lenp;th 

 of the epiphallus) beyond the junction of the vas deferens, which 

 enters at the base of an appendage corresponding with the kale- 

 sac (1-) ; this sac is about equal in length to the distance between the 

 junction of the vas deferens and the retractor muscle. No caecum of 

 the penis. A very long spermatheca, in which three spermato- 

 phores of the type usually seen in Macroclilamys and its allies were 

 found. No dart-sac. 



The jaw (D 1) is narrowed, smooth, with an obtuse projection 

 in the middle of the concave side. The radula (D 2) is composed 

 of about 60 transverse series, with the approximate formula : 

 50 . 10 , 1 . 10 . 50. Median tootli small, without lateral cusps, the 

 ten laterals on each side larger than the median tooth, those near 

 the median tooth bicuspid, having a large outer cusp, those towards 

 the exterior tricuspid ; outer laterals bicuspid, with an outer denticle 

 near the base, which disappears in the narrow marginal teeth. 



All the species referred to this generic group are of small size. 

 It is an open question whether S. diphdon and its allies should be 

 included ; they are arranged here provisionally until their animals 

 are known. The shells of the typical form closely resemble those 

 of North-American Helicida? of the genus Triodopsis. 



A. Conoidly depressed or subturbinate, costulate or siibcostidate 

 above, imperforate or narrowly 'perforate. 



a. Teeth in aperture. 



a'. Three palatal teeth. 



366. Sesara infrendens, Gould (Helix), Bost. Jour. N. H. iv, 1844, 

 p. 453, pi. i'4, tiir. 6 ; Pfr. Man. Hel. \, 1848, p. 152 ; id. vii, 1876, 

 p. 27G; Stoliczha, J.' A. S. B. 1871, p. 242, pi. 16, figs. 4-10 

 ( aiiatomv) ; Pfeffhr, JB. mah Ges. v, 1878, p. 272 ; id. Arch. d. 

 Natun/esch. xliv, 1878, p. 425. pi. 13, fig. 10. 



Helix ca'pessens, Bs. A. M. N. H. (2) xviii, 1856, p. 250 ; Pfr. Mon. 

 Hel. iv, 1859, p. 194 ; id. vii, 1876, p. 306 ; H. Sf T. C. I. 1876, 

 pi. 60, fig. 5. 



Helix tickelli, Theobald, J. A. S. B. xxviii, 1859, p. 306 ; H. S,- T. 

 C. I. 1876, pi. 15, fig. 3. 



[Fig. 81, D-D 2.] 



Shell imperforate, depressedly conoid, tawny, arcuately costulate 

 above, the ribbing passing over the periphery and gradually dis- 

 appearing below\ Spire conoid with convex sides, suture im- 

 pressed ; w'horls 7, convex, slowing increasing, the last more or less 

 angulated or carinate at the periphery, or sometimes rounded, 

 moderately convex beneath, slightly hollow in the middle ; aperture 

 slightly oblique, narrow, with three teeth on the basal margin ; 

 peristome slightly thickened, basal margin arcuate. 



Major diam. 10, min. 9, axis 5 mm. 



Hah. Moulmein and Tavoy. 



This shell varies in height of spire, in the roundness or carina- 

 tion of the periphery, and in the teeth. Usually the latter are 

 subequal and nearly equidistant, the middle one being often nearer 



s2 



