258 TRANSACTIONS OF THE WAGNER FREE 



in the future devotes himself to the study of this minute, populous and per- 

 plexing group, and who can compare specimens with the types of Orbigny in 

 European museums, will doubtless find many rectifications of nomenclature to 

 make which at present are impracticable. 



Turbonilla speira Ravenel ? 



Chefnniizia speira Rav., Proc. Elliott Soc. Nat. Hist. i. p. 280, 1S59, 



Turbonilla speira Holme?, Post-Pl. Foss. S. Car., p. 82, pi. xiii. figs, i, i a, 1859. 



Pliocene of the Caloosahatchie beds ? Post-Pliocene of South Caro- 

 lina. 



I had for some time supposed that Ravenel's species was a somewhat 

 abnormal specimen of T. intemtpta. But among the fragments found in the 

 Caloosahatchie marl is a broken Turbonilla which presents characters 

 resembling those illustrated in Holmes's figure, and which is probably differ- 

 ent from any variety of interrvpta. The principal characters are the few but 

 rather strong, wave-like ribs not interrupted at the base, the sharp, well- 

 defined spiral sculpture covering the shell, and a prominent spiral a little in 

 front of the suture which gives an obscure shoulder to the whorl. As far as 

 I have been able to learn, no authentic specimens of Ravenel's species exist 

 anywhere, and our whole dependence must be placed on Holmes's figure of 

 it. The fragment referred to may perhaps be identified with it. The pillar 

 is distinctly twisted and the whole shell is more conical than most of the 

 species. 



Turbonilla chipolana n. s. 



Older Miocene of the Chipola beds. Burns. 



Shell small, slender, with a smooth nucleus and nine to sixteen subse- 

 quent sculptured whorls ; sculpture of fifteen to twenty smooth, nearly 

 straight, close-set ribs extending from the suture forward to and becoming 

 obsolete on the base ; spiral sculpture of six or more fine, incised lines nearly 

 equidistant between the suture and the periphery, visible only between the 

 ribs, a few others faintly visible on the base ; sides of the spire rectilinear, 

 suture distinct, applied a little in front of the periphery ; aperture 

 rounded in front, pointed behind, with a distinct though very small, thread- 

 like plait coiled on the middle of the pillar. Lon. (of a specimen of ten 

 whorls) 4.25 ; max. diam. i.o mm. 



This species grows longer than the dimensions given, but of the larger 

 ones I have only seen fragments. 



This species is very close to T. virga Dall, but has the spiral grooving 

 less conspicuous, while T. virga has not the raised thread on the pillar. In 

 T. virga the sides of the spire have a less rectilinear habit. 



I refer provisionally to this species a fragment of three whorls (4.25 

 long by 1.75 in diam.) with about twenty-eight fiexuous ribs and rather 



