SPIRAXIS. 19 



slender but otherwise exactly similar. Chitty's 8. contorta 

 was 'based upon a specimen of 8. anomalus. It measured 7.5 

 x 1.75 mm., with 10 whorls. 



Pfeiffer changed the name of Adams' species on account 

 of his own earlier Achatina anomala, which he transferred to 

 Spiraxis in 1853 ; but that species is a Leptinaria and was not 

 referred to Bulimus or Spiraxis until after the publication by 

 Adams of his B. anomalus. 



4a. S. (?) PARVULUS (Chitty). 



"Shell sub-cylindrical, whitish with a yellowish epidermis, 

 with strong transverse striee on the last 5 whorls, becoming 

 obsolete on the lower extremity of the last whorl. The apex 

 quite free from striae. Spire with almost rectilinear outlines. 

 Apex very obtuse. Whorls 7, rather turretted; last whorl 

 much so. At one-half of the labrum the aperture is singu- 

 larly constricted, and there is a large opal white tooth, at the 

 point of constriction ; thence it is very abruptly truncated, 

 and the labrum thickened ; the columella is considerably thick- 

 ened; and is also of an opal white. Aperture very long, 

 much twisted and sub-angular above. Mean divergence about 

 12. Length .14, breadth .04, length of aperture .04, Habitat 

 -? From Dr. Hyde." (Chitty}. 



Acha-tina parvula CHITTY, Contrib. to Conch, no. 1, p. 14 

 (Oct., 1853). PFR., Monogr. iv, p. 618. 



A problematic Jamaican snail, known to me by the above 

 description only. 



Subgenus RAVENIA Crosse. 



Ravenia CROSSE, Journ. de Conchyl. xxi, 1873, p. 69 ; xxii, 

 1874, p. 67, for E. Uandi Crosse, t. c. p. 69, pi. 2, f. 4. 



This group has been included in Vol. I by Mr. Tryon, p. 52. 

 It seems to be very closely related to Euspiraxis, differing 

 only by the slightly thickened outer lip, which has a more 

 prominent angle in the middle, as seen in profile view, than 

 the Jamaican forms. The columellar lamella is not quite 

 so prominent. These differences) would not be thought of 

 much importance were it not for the remoteness of the local- 



