90 TRANSACTIONS OF THE WAGNER FREE 



the spirals are finer and continue more distinctly over the whorls in the 

 adult; the adult shell has six whorls beside the nucleus, T. Wilsoni has eleven 

 or more in the same length. 



T. chipolmia varies, as all the species do to some extent, in its elongation 

 and in the presence or absence of an umbilical chink ; the aperture is more 

 than half the length of the shell and has a prominent sinus behind ; the aper- 

 tural callus is prominent, the lip simple, the canal narrow and moderately 

 differentiated. A rather short, thick specimen measures 120.0x55.0 mm., 

 without the nucleus; a more elongated specimen 1 38.0 x 55.0 mm., the aper- 

 ture being 85.0 mm. long. The nucleus is remarkable, consisting of more 

 than four (none are complete) spirally striate, or srnooth, regularly coiled 

 whorls, probably preceded by a tip like that of T. regina (PL 10, fig. 7). The 

 fourth of these whorls has exactly the same diameter as the first, so that the 

 coil is nearly subcylindrical, having a length of 9 and a diameter of 3.5 mm. 

 If to this we add the lost tip, we have a larval shell more elongated than that 

 of T. regina, though the latter is by far the most slender shell. 



Turbinella regina Heilprin. 

 Plate 3, figure 4. 

 T. regina Heilprin, op. cit. p. 74, pi. 3, fig. 5, 1887. 



Caloosahatchie beds, on the Caloosahatchie River and Shell Creek in South 

 Florida, in the Pliocene marls. 



This fine and well-marked species has as many as eleven whorls after the 

 nucleus, of which about five are transversely ribbed with five or six transverse 

 ribs. The nucleus is peculiar, being composed of four whorls, of which the 

 first is irregularly ovoid and more swollen than those which succeed it, being 

 the primitive protoconch ; the succeeding larval whorl, instead of being 

 evenly rounded, as in the larva of T. chipolana, is constricted in front of the 

 suture and has a peripheral keel, the next whorl or two are rounded and 

 smooth until the normal shell-structure of the spire begins. The final whorl 

 of the larva is of slightly less diameter than either of those which precede it. 

 The specimen figured is 42.0 mm. long, but the adult attains ten times that 

 length, with a maximum diameter of 105.0 mm. 



Turbinella scolymoides n. s. 

 Plate 3, figures 2, 5. 

 Pliocene of the Caloosahatchie beds. 



Shell much resembling the recent T. scolymus L., especially when young, 

 but having a more elongated and acute spire and canal, with two more whorls 

 to the same diameter in the young shell ; it is more globose, smooth and less 

 ribbed on the body-whorl and with a proportionally shorter canal in the 

 adult. Whorls ten or eleven without the nucleus, from which the protoconch 

 has in all the specimens been lost during the life of the animal. 



