t20 TRANSACTIONS OF THE WAGNER FREE 



another in which that part was entire. The total length of the figured speci- 

 men is about 60.0 mm., with a width of 32.0 mm. 



This form was found only in the silex-beds, though further search would 

 doubtless have revealed it at Chipola. I have seen specimens from the Mio- 

 cene of South Carolina. 



The form which succeeds M. sculpturata in the Pliocene has a smoother 

 surface, a shorter and wider form, more spines, and more ribs on the early 

 whorls. M. sculpturata, on the whole, would appear to stand about midway 

 between the Eocene and Pliocene forms, as regards its superficial characters. 



It may be noted that the typical sculpturata has spines almost identical in 

 form with those of Papillina duinosa Conrad, from which the young may be 

 distinguished by their small spiny apical whorls and their short and slightly 

 curved canal. 



Melongena subcoronata Heilprin. 

 Melongena subcoronata Heilprin, Trans. Wagner Inst. i. p. 70, pi. i, figs. 3, 3 a, 1887. 



Caloosahatchie beds, Willcox, Heilprin and Dall. 



Melongena subcoronata var. aspinosa Dall. 

 Plate 9, figure 6. 



Caloosahatchie beds, rare ; Dall and Willcox. 



In this variety, which is always of moderate size, while the young is ex- 

 actly like the young of the typical form, the older whorls do not develop 

 spines or tubercles, but have the whorls obscurely transversely ribbed, the 

 spiral sculpture not being altered. It is probable, since none of the specimens 

 I have seen are of the full size of completely adult specimens of the typical 

 subcoronata, that this variety does ultimately develop one or two spines on 

 the shoulder near the aperture on attaining maturity. The specimen figured 

 measures 65 x 31 mm. 



The variations of the species in this group have already been alluded to. 

 This subcoronata varies in exactly the same way as the typical M. corona, but 

 in a very large series I have found but one or two specimens of subcoronata 

 which could be exactly matched from the series of corona, and these excep- 

 tional specimens were all immature. The fully adult subcoronata is larger 

 than the largest corona I have ever seen, and has more solid spines. The 

 spire resembles that of corona, if looked at from behind the apex, but on a 

 side view the species would (when fully developed) be taken rather for M. 

 melongena L. The suture is less imbricated than in corona, and there are 

 fewer and less prominent spines on the anterior part of the shell, which is 

 more frequently free from spines than the same area in corona. On the whole, 

 I think the name might be retained conveniently, though doubtless the Post- 

 Pliocene and living Melongena corona is the direct descendant of this Pliocene 

 type. The adult M. subcoronata measures 100 by about 140 mm. I have 

 not seen any fossils which seemed referable to subcoronata except from the 

 Florida Pliocene. All the later ones are unmistakable M. corona. 



