250 DAVENPORT ACADEMY OF NATCRAL SCIENCES. 



272. MoDiOLA TULiPA, L. VAX. NIGRA, CalMns. From Key Vaccas. 

 Uniformlj' dark, while 31. iulipch from same locality is distinctly marked 

 with pinkish rays. May be compared with M. castanea. Say, but is larger 

 and longer. Both are varieties of M. tuUpa. 



27:^. Tritonidea TiNCTA. Co)!. Whether different itova. T. ringens I 

 cannot determine. 



274. Cerithium atratum, Bni.g. From the Gulf coast. 



275. Venus [Anomalocardia] flexuosa, L. Common. 



276. CoLUMBELLA OBESA, C. B. Ad. Loc, the Gulf coast. 



277. EiciNULA NODULOSA, C. B. Ad. A West Indian species. Loc, 

 the Keys. 



278. Pleurotoma VEXILLU3I, Dunker. According to Mr. Tryon, 

 this species is a variety of PL Zebra, Lam. Loc, Tampa, Fla. 



279. Clathl'rella badia, Beeve {?). Following the advice of Mr. 

 Tryon, who has compared the specimens with others in the Philadelphia 

 Academy, I give them the above name provisionally. If not this spe- 

 cies, it is new. Loc, the Gulf coast. 



280. Cerithiofsis terebralis, C. B. Ad. Loc, Cedar Keys and 

 Tampa. 



28'. Siphon ARi A BiFURC ATA, iiiss. More elevated than S. alternata. 

 Say. Loc. the west coast. 



282. Brittium gibberulum, C. B. Ad. As Mr. Tryon remarks, 

 Bissoa aberrans, C. B. Ad., appears to be the same species. Loc, the 

 Gulf coast. 



283. Littorina trochiformis. Dill. Appears to me quite the same 

 as L. nodulosa, Desh. Loc, the Keys. 



284. Terebra PR0TEXTIJ3I, Con. Dredged by me at Cedar Keys. 

 Found also further south. 



285. Ti VELA (Trigorja) TRIGONELL A, ia?7i. Loc, Gvilf coast. 



286. OBELiscrs, sjj. indet. Tampa. 



287. CANCELLARIA STIMPSONII, n. s., Plate viii, figs. 4^5. 

 Shell rather small, whitish, rough, nodulous ; whorls about four and a 



half, prominent, finely ribbed ; the last large, with a row of nodules 

 on its upper edge, and numerous others scattered irregularly over its 

 surface ; the other whorls covered with smaller nodules, the upper part 

 of each flat or shouldered; umbilicus large, flaring outwards; deep; 

 aperture triangular, slightly oval, the upper part square shouldered ; lip 

 thin, the outer one somewhat thickened by nodules on exterior edge ; two 

 plaits well within the aperture on the columella ; length, 17 mill., breadth, 

 12 mill. Loc, Cape Sable, Fla. My collection. 



Bemarks.—A single specimen of this new and interesting species was 

 found by Dr. J. W. Yelie on the beach at Cape Sable, and from its 

 appearance, had recently been alive. It is in good condition. Believing 

 it to be undescribed, I sent the shell to Mr. Tryon. I cannot do better 



