38 ORCULA. 



deeply, others when present being short and confined to the 

 columellar lip-expansion. Boettger and Retowski, who 

 handled more of the Caucasian forms than any other writers, 

 consider all to be forms of raymondi. As the material at hand 

 comprises only various forms of trifilaris and bifilaris, and 

 not the typical raymondi, I am unable to review the question 

 of specific identity of the Caucasian forms with raymondi. 

 All of the references are given under the latter. 



Small, length 2.5, diam. 1.5 mm. ; bristles well developed ; 

 three thread-like lamellae on columella ; Beyrout. 



0. raymondi. 

 Larger, diam. about 2 mm. or more. Caucasus, etc. 



4 lamellae on columella. 0. r. trifilaris f. quadrifilaris. 



3 lamellae on columella. 



Supracolumellar, columellar and infracolumellar. 



0. r. trifilaris. 

 A short lamella between columellar and supracolu- 

 mellar. 0. r. bifilaris f. intermedia. 

 2 lamellae on columella. 0. r. bifilaris. 



14. Orcula raymondi (Bgt.). PL 4, fig. 1. 



The shell is small, perforate, cylindric, of a tawny-corneous 

 tint, ornamented with small, oblique, whitish, symmetric raised 

 epidermal laminae which are prolonged in the upper part of 

 the whorls in stiff, acute, lengthened and ascending points. 

 The epidermal laminae, very closely placed on the earlier 

 whorls, become more and more spaced as they approach the 

 aperture. Spire extremely obtuse, the summit smooth and 

 paler. Seven quite convex whorls, slowly, regularly increas- 

 ing, and separated by a strongly impressed suture. The first 

 whorls are subangular as though keeled, where the epidermal 

 laminae are produced in form of acute darts; the carina dis- 

 appears on the fourth whorl. The last whorl is rounded, a 

 little oblong, and markedly ascending towards the aperture. 

 Aperture slightly oblique, oblong, whitish within and pro- 

 vided with 4 lamellae : the first [parietal lamella] strong, com- 

 pressed and elevated on the convexity of the penult whorl, 



