18 



SPIRAXIS. 



show. It is related to S. anomalus rather than to inusitatus, 

 but is distinct by its small size and closely placed riblets. The 

 axial lamella is strong in the last whorl but does not pene- 

 trate much deeper. It is more oblique than in S. inusitatus, 

 and (there is no parietal lamella (fig. 5). Length 4, diam. 

 1 mm., whorls 7. Adams' type specimen is a trifle larger but 

 otherwise exactly similar to that figured. 



4. S. ANOMALUS (C. B. Adams). PL 1, figs. 6, 9. 



Shell imperforate, narrowly turrite, rather solid though 

 thin; the dead specimens known are of a gray- whitish tint 

 and without luster. Sculpture of rather close, very delicate 

 longitudinal riblets, nearly straight on the spire, somewhat 

 sinuous on the last whorl. Spire straightly tapering, the apex 

 obtuse. Whorl 9y 2 to 10, decidedly convex, the last one or 

 two flattened peripherally. Aperture subvertical. Outer lip 

 thin, bearing a tubercular tooth in the middle and often 

 others back of it in the throat. Columella concave below, 

 very strongly twisted above, into an entering lamella which 

 projects strongly into the aperture. 



Length 8, diam. 2, aperture 1.7 mm., whorls 9% (Ad. coll.). 



Length 8.8, diam. 2, aperture 2 mm., whorls 10 (Hender- 

 son coll.). 



Length 6.9, diam 1.7 mm., whorls 9 (Henderson coll.). 



Jamaica: Manchester Back Mountains (Chitty, type loc. 

 of 8. contorta) ; Ipswich (Jarvis). 



Bulimus anomalus C. B. ADAMS, Oontrib. to Conch, no. 2, 

 p. 28 (Oct., 1849) ; not Bulimus anomalus Pfr. of Albers, 

 1850, Achatina anomala Pfr. Spiraxis anomalus C. B. AD., 

 Oonitrib. no. 9, p. 168, 184. Spiraxis adamsiana PFR., Zeitschr. 

 f. Malak. 1852, p. 178; Monogr. Hel. Viv. iii, 473. Spiraxis 

 contorta CHITTY, Contrib. ,to Conch, no. 1, p. 16 (Oct., 1853). 

 Ravenia hollandi HENDERSON, Nautilus xii, p. 25, fig., July, 

 1898. 



In the C. B. Adams collection there is one broken shell, the 

 original type, and a perfect but "dead" one evidently added 

 later, and shown in my fig. 6. A broken shell in coll. A. N. S. 

 is like these. The type of R. hollandi (fig. 9) is a trifle more 



