INSTITUTE OF SCIENCE, PHILADELPHIA. 89 



Scaphella floridana Heilprin. 

 Plate 7, figure 8. 

 Vo/uta floridana Heilprin, Trans. Wagner Inst. i. p. 77, fig. 8, 18S7. 



Pliocene of the Caloosahatchie beds, Messrs. Willcox, Heilprin, Dall, etc. 



This fine species differs from Scapliella jiinonia by its greater size and more 

 acute spire, and from the 5. Trenholniii of the South Carolina Miocene by 

 more fusiform shape and prominently cancellated early whorls. The num- 

 ber of plaits and the pattern of coloration, which is occasionally preserved, 

 are the same. These differences were pointed out in his original description 

 by Prof Heilprin. 



It is to be remembered, however, that S. junonia is still very rare, and 

 usually has been polished or mutilated by the dealers, and that no sufficient 

 series of 5. Trenliolviii has ever been brought together ; a larger series might 

 efiTace the discriminating characters referred to and lead us to regard the three 

 forms as varieties of the same stock in process of development in geological 

 time. The differences, though intensified, are those which I have found exist- 

 ing to a certain extent in the seven or eight specimens of 5. junonia which I 

 have been able to bring together for study. 



Bucymba ocalana Dall. 

 Plate 7, figure i. 



Adult shell short and broad, subglobose, with a short and rather wide 

 canal ; nucleus low and wide, with an obscure eminence at the summit, the 

 external surface slightly amorphous, and the whole nucleus inclined to one 

 side ; early whorls finely, evenly, spirally striate, as in Caricella ; later ones 

 with occasional faint spiral markings, otherwise smooth except for lines of 

 growth ; suture closely appressed at first, later the outer margin slightly 

 rounded ; spire obtuse, with a short and gentle slope, rounded at the shoulder 

 and gradually diminishing toward the base; in the young (see figure i.) the 

 canal is long, narrow and shallow ; in the adult it is proportionately much 

 shorter and wider ; shell thin, except the pillar, which is straight and strong, 

 bearing four subequal oblique plaits, the posterior of which lags a little behind 

 the others ; there are no internal lirae, nor any indications that the lip was 

 otherwise than simple; it recedes a little from the shoulder to the suture, but 

 does not form a notch, in front of the shoulder it falls away to the canal 

 almost as in Caricella. There is but a slight wash of glaze on the body inside 

 the aperture and none outside ; the callus on the pillar is also rather thin for 

 so large a shell ; there is no siphonal fasciole. 



An internal cast of an adult measures loo.o mm. in length, though the 

 canal is not entirely complete. The max. diam. of the same is 83.0 mm. The 

 specimen had four whorls beside the nucleus, which contains i^ to 2 whorls. 

 The young specimen figured measured 48.5 x 21 mm. The max. diam. of 

 the nucleus, in a crushed specimen which retains the shell, is li.O mm. 



