EASTERN PROVINCE SOUTHERN REGION SPECIES. 415 



roimded, with numerous oblique, prominent strife or ribs; suture 

 impressed, creuulated by the extension of tlie al eruate y^^, ^.g 

 ribs across it; aperture rounded, oblique ; ])eristome tliiu, 

 somewhat reflected ; axis impressed, not truly perforate; 

 on the last whorl a colored line revolves; this is some- 

 times raised a little from the surface, and sometimes is 

 sharp, like a delicate carina. Length, IS™""; diameter of 

 antepenultimate whorl, 6^""'. Of aperture: Length, 4J"""; 

 breadth, 4J'""\ pontificus. 



Pupa nnicarinata, Bixney, Terr. Moll., i. — Not Lamarck. 



BuUmus Kieniri, Pfeiffek, Proc. Zool. Soc, 1846, 40; Moii. Hel. Yiv., ii, 79 ; in Chem- 

 nitz, ed. 2, 131, pi. xlii, figs. 23, 24. — Reeve, Con. Icon., 463. 



CtjUndrella poniifica, Gould, Proc. Bust. Soc. Nat. Hist., iii, 40 (1848) ; Terr. Moll., ii, 

 306, pi. ixix, fig. 1.— Chenu, Mnn.de Concli., i, 446, figs. 3305, 3306 (1859). 



Macroceramus pontificus, W. G. Binney. Terr. Moll., iv, 137. 



Macroceramus Kieneri, Pfeiffek, Mon. Hel. Viv., iv, 689, not of vol. vi. — Tuyon. Am. 

 Journ. Couch., iii, 301 (1868).— W. G. BiNXEY, L. & Fr.-W. Sh., i, 221 (1869); 

 Terr. Moll., v, 383. 



In the Florida Subregion, both on tie mainland from the Miami 

 country to Tampa Bay and on the islands from Key West to Key Bis- 

 cay ne. 



Animal whitish, translucent, a little darker above the head; body very 

 short, terminating- in a blunt extremity ; eye-peduncles of moderate 

 length, of nearly equal diameter throughout, terminating in a rounded 

 bulb; tentacles very short, nearly rudimentary; ocular points large 

 and black. When in motion the axis of the shell is parallel with the 

 line of progress and lies almost horizontally. The rapidity with which 

 the animal moves is quite surprising. The advance seems to be effected 

 in this way : The posterior point of the disk of the foot, being detached 

 from the object on which it rests, is carried forward by muscular con- 

 traction and again fixed, leaving a curve between the attac^ied point 

 and the next anterior part of the disk, which is not yet detached. This 

 operation is continued throughout the whole disk, every part of which 

 becomes successively detached, curved upward, and again attached, 

 from the extremity to the snout, exhibiting in action a curved or wavy 

 motion or undulation, commencing at the extremity, proceeding rapidly 

 forward, and terminating at the h':>ad. But before one muscular wave 

 is exhausted at the head another has begun to flow, so that two series 

 of undulations are visible at one time. With this double alternation 

 of action tlie body is propelled with a rapidity greater than can be 



