SPIROSTEMMA. 293 



The aperture is very oblique, as in the tenella group. 



10. S. SIMILIS (C. B. Adams). PL 35, figs. 47, 48, 49. 



Shell pillar-shaped, the upper third or fourth of the length 

 tapering, pale brown, minutely and closely striate. Whorls 

 10-101/2, the earlier ones convex, later whorls less so, the last 

 whorl carinate below, quite shortly free in front. Aperture 

 oblique, subcircular, the lip well reflexed, wider above and 

 on the left side. Internal axis rather strongly spiral in the 

 last 4 whorls. Length 12, diam. 2.3 mm. ; whorls 10% . 



Jamaica. 



Cyl. similis C.B.AD., Contrib. no. 2, p. 23 (Oct. 1849). 

 PFR., Monogr., iii, p. 580 ; Conchyl. Cab., p. 68, pi. 7, f . 24-26. 

 GLOYNE, Journ. de Conchyl., 1875, p. 122. 



The description and figures 47-49 are from specimens re- 

 ceived from Adams. Pfeiffer has figured a similar shell. 

 The outline of the aperture is but slightly modified by the 

 basal keel, but often the peristome is somewhat produced in 

 the middle of the columellar margin, and perceptibly less 

 arcuate on each side of this slight lobe (fig. 49), giving the 

 mouth a characteristic contour, even though the departure 

 from the circular form is but slight. The last whorl is pro- 

 duced forward less than in U. elatior. 



Adams' original account follows: "Cylindrella similis is 

 perhaps another variety of C. dunkeri Pfr., but is much 

 smaller, has the aperture less angulated anteriorly, angulated 

 at the left end of the upper side, and the lip is much more 

 arched above; the striation is finer in proportion to the size; 

 9 or 10 whorls are lost by truncation, and 12 remain. Length 

 .475 inch., breadth .09 inch." 



Gloyne reports finding two specimens above Newcastle. 



11. S. INTERMEDIA (Sowerby). Vol. XVI, pi. 11, fig. 74. 



* ' Shell cylindrical, high, narrow, brown, contracted towards 

 the apex; permanent whorls 11, striated, rather straight. 

 Aperture a little disjoined, large, obliquely ovate; margin 

 thick/' (Sowb.). 



C. intermedia SOWB., C. Icon, xx, pi. 10, f. 91 (1875). 



Ha.bitat unknown; type in coll. Sowerby. I refer it to 



