RULIMULUS. 397 



and has its base enclosed in a short prepncc ; the vas deferens terminates in, 

 and the retractor muscle is inserted into, its summit ; the genital bladder is 

 oval, its duct is not more than one third the length of the oviduct, and dilates 

 as it passes downwards. 



Bulimulus Dormani, W. G. Binney. 



Shell perforated, thin, transparent, shining, elongated-conic, of a very light 

 waxen color, with several regular revolving series of interrupted, 

 perpendicular, reddish-brown patches ; suture distinctly marked ; ^'g- 280. 

 apex punctured ; whorls 6, rather convex, marked with numer- 

 ous very fine revolving lines ; upper whorls striate, last whorl 

 full, with a hardly perceptible obtuse carina at the upper ex- 

 tremity of the peristome. Length, 29 mill.; diameter, 12 mill. 



Bulimus Donnani, W. G. Binney, Proc. Acad. Nat. Sci. Philad., 

 1857, 188 ; Terr. Moll., IV. 132, PI. LXXX. Fig. 10 ; L. & 

 Fr.-W. Sh., I. — Pfeiffer, Mai. Bliitt., 1859, 45. 



Liostracus Donnani, Tryon, Am. Journ. Conch., III. 169 (1867). ^' ^'"■'"''"'• 



Florida Subregion. Found at several points, among them Hanson's, near 

 St. Augustine, Florida, by O. M. Dorman ; also at General Hernandez's plan- 

 tation on the Matanzas River ; Port Orange, Halifax River ; from between 

 Cedar Keys and Suwanee. 



Judging from the description and figure given by Reeve, Bulimus macxdatus, 

 Lea, of Carthagena, New Grenada, must be nearly related to this species. 



Tlie original specimen from which my former description was drawn was 

 thickened and of a chalky white, probably having been burned. I have re- 

 cently received from Mr. Dorman fresh specimens which are very thin and of 

 a waxen hue. 



Animal of a dirty white ; mantle banded as the shell. Usually found adher- 

 ing to the under side of the leaves of palmetto, high above the ground. 



Jaw as usual in the subgenus, thin, transparent, slightly arcuate, wide, ends 

 attenuated, blunt; anterior surface with about 54 distant, plait-like ribs, those 

 of the upper median portion decidedly converging. 



Lingual membrane (PI. X. Fig. F) with about 79 — 1 — 79 teeth, of the form 

 already noticed in Bui. lalicincius, Bahamensis, aurisleporis, papyraceus, Jonasi, 

 Tiiembranaceus, etc., etc., but hitherto unnoticed in any North American species. 

 The centrals have a base of attachment longer than wide, a stout, short, tri- 

 cuspid reflection, each cusp bearing a distinct cutting point. Laterals with 

 equilateral base of attachment, large irregularly tricuspid reflection ; the cut- 

 ting point is extremely wide, oblique, tricuspid, the central division the largest. 

 The marginals differ only in smaller size, more elongated reflection, and instead 

 of the single outer cutting point there are three or four, giving a serrated ap- 

 pearance. The lingual membrane is broad. 



