INSTITUTE OF SCIENCE, PHILADELPHIA. 1 23 



our figure) seems somewhat blunt, but when perfect, though short, it is quite 

 acute; sculpture of 12-15 transverse rounded ribs, beginning at or near the 

 suture and continuing over the periphery, becoming obsolete on the base of 

 the whorl ; the incremental lines are also somewhat alternated in strength 

 and quite distinct ; the spiral sculpture consists of (on the last whorl ten or 

 twelve) sharp, even ridges, which override the ribs and descend into the inter- 

 spaces, and each of which is usually accompanied by a pair of very fine, sharp 

 threads parallel to it in the separating grooves ; the ridges are usually very 

 even in strength, but on the canal vary, being sometimes weaker or even 

 almost absent there; suture distinct, undulated by the ribs, not channelled; 

 whorls full and rounded, the last constricted at the base ; aperture rather 

 elongated, differentiated from the canal; the throat strongly lirate, with 8-10 

 elevated threads ending a little way within the edge of the outer lip, which is 

 crenulated by the sculpture; pillar simple, with a thin callus; canal narrow, 

 deep, somewhat recurved ; siphonal fasciole strong, enclosing with the re- 

 flected pillar a moderate, not very deep umbilical pit ; specimens vary in rela- 

 tive stoutness ; one, with the nucleus, measures 24X 16 mm.; another, which 

 has lost the nucleus, 25 x 18 mm. 



This elegant little shell is named in honor of Capt. Menge, in charge of the 

 dredging operations of the canal company, to whom Mr. Willcox in his col- 

 lecting tour is indebted for numerous courtesies. 



Solenosteira inornata n. s. 



Molds in the CeritJiitim limerock, stated by Heilprin to underlie the silex- 

 beds at Ballast Point (where I did not find any indication of it), and in the bed 

 of the Hillsboro River above Tampa. Gutta-percha casts from these molds 

 afford the material for the following description. 



Shell with a rather elevated spire and six or seven rapidly enlarging 

 whorls; nucleus small, apparently smooth, blunt, with about one turn ; subse- 

 quent whorls spirally sculptured with fine, low, even threads with equal or 

 wider interspaces, on the last whorl more or less alternated in strength ; trans- 

 verse sculpture of eight or nine rounded ribs, most prominent at the 

 periphery, feebler in front of the suture, and on the last whorl not unlike those 

 of Latirus floindanus ; whorls strongly appressed at the suture and somewhat 

 constricted in front of it and at the base ; suture distinct, sometimes with a 

 corded anterior margin ; canal short, wide, stout, the posterior edge of the 

 siphonal fasciole keeled ; aperture ovate, outer lip arched forward, posterior 

 commissure narrow ; pillar smooth, reflected in front so as to nearly cover 

 a moderate umbilical chink ; canal wide, rather deep, spirally sculptured like 

 the rest of the shell ; the casts indicate that on the periphery of the whorls 

 one of these threads may be a little more prominent than any of the rest. 

 Approximate measurements 36 x 20 mm. 



