INSTITUTE OF SCIENCE, PHILADELPHIA. I7 



In the soft parts the admedian teeth o{ Bucconia are shorter, the rhachidian 

 tooth proportionally larger, the lateral plates of the gizzard are rounded quad- 

 rate instead of rounded triangular, as in the typical species. Type Scaphander 

 nobilis Verrill, Trans. Conn. Acad. Sci., vi. p. 209, pi. xxxii. figs. 18-18 d, 1884. 

 The other features of the soft parts are presumably like those of typical Sca- 

 phander, to which Verrill referred it. The distinctions between these sections 

 of the genus are. obvious and are not fully bridged by any of the species, 

 though 5'. punctostriatus points the way. The two sections are by no means 

 modern, both being represented in the Eocene. Bucconia is a thin-shelled 

 Sabatia without a body-callus. 



Scaphander (Bucconia) grandis Aldrich. 

 Plate 10, figure 9. 

 Haminea £-rafidis Aldrich, Geol. Surv. Alabama Bull. No. i, p. 35, pi. 3, fig. i, 18S6. 



Jackson group of the Eocene at Bunker Hill, Louisiana, Aldrich. Ocala 

 beds, Central Florida, Willcox. 



I have refigured this magnificent species from a fine specimen obtained at 

 Ocala, measuring 66 x 40 mm. 



Section Scaphander s. s. 

 Scaphander primus Aldrich. 



Scaphander primus Aldrich, Journ. Cin. Soc. Nat. Hist. 1885, p. 14S, pi. 2, figs. 7 a, 7 b, July, 

 1885. 

 Vicksburg beds at Red Bluff, Miss., Aldrich. Orbitolite bed at Tampa 

 City and 6 miles northeast from Tampa, near Lapenotiere's Sulphur Spring; 

 Dall. These are casts, but agree very well with Aldrich's figure. The largest 

 measures 29 x 16 mm. The shell is rather thick for thegenu.s, and about one- 

 fourth of the way from the apex forward internally there was a thickened 

 ridge or line which leaves a perceptible trace on the internal cast. 



Genus ATYS Montfort. 

 Atys Sandersoni Dall. 



A. Sandersoni Dall, Bull. Mus. Comp. Zoology, ix. p. 99, 1881 ; xviii. p. 54, pi. xvii. fig. 7, 

 1889. 

 This species has been received from the Pliocene of the Caloosahatchie 

 and Shell Creek, collected by Willcox and Dall. It is found living from Cape 

 Hatteras southward through the Antilles, living in 8-40 fathoms, though 

 occurring dead in dredgings from deeper water. 



Family BULLID^. 



Genus BULLA Linn6. 



Bulla striata Bruguiere. 



This well-known species is found living as far north as Charlotte Harbor 



on the west, and as Jupiter Inlet on the east coast of Florida ; also on the 



coast of Texas ; but its presence on the western shores of Florida north of 



