at the upper part ; peritreme thin, continuous, separated, with 

 an obtuse edge ; suture distinct, having the appearance of a 

 groove ; umbilicus small. 



44. C. SEMiLABBUM. (pi. xxiv. f. 60.) Lom. 



T. oblonga, sub-cylindracea, subacuminata, apice decollate, 

 spira aperturam fere duplo superante ; anfractibus quatuor, 

 rotundatis, tenuissime decussatis, interruptim fusco-lineatis ; 

 apertura subovali, superne angulata ; peritremate tenui, extus 

 subpatente ; sutura indistincta ; umbilico minimo. 



Shell oblong, nearly cylindrical, slightly acuminated, the 

 apex decollated ; spire nearly twice the length of the aperture ; 

 volutions 4, somewhat rounded, very finely decussated all 

 over, with interrupted spiral brown lines; aperture nearly 

 oval, angular at the upper part ; peritreme thin, the outer 

 edge somewhat spreading; suture distinct; umbilicus very 

 small. Cuba. 



45. C. RUFiLABRUM. (pi. xxiv. f. 61.) Bcck. M.S. 



T. oblonga, cylindracea, fulvescente, apice decollate ; an- 

 fractibus 4 — 5, spiraliter sulcatis, sulcis decussato-crenulatis, 

 lateribus subrotundatis ; sutura inconspicua ; apertura ellip- 

 tica ; peritremate incrassato, subexpanso, nigricante. 



Shell oblong, nearly cylindrical, yellowish brown, apex 

 decollated ; volutions from four to five, spirally grooved, the 

 grooves crossed by decussating lines which give a crenulated 

 character to the intermediate threads, sides of the volutions 

 somewhat rounded ; suture not very conspicuous ; aperture 

 elliptical, with a thickened, somewhat expanded, blackish 

 peritreme. From St. Croix, Dr. Beck. 



46. C. TRANSLUCIDUM. (pi. xxiii. f. 4.) 



T. subglobosa, subpellucida, alba, epidermide corneo 

 induta; spira breviuscula, obtusa, anfractibus quatuor, 

 rotundatis, prope suturam elevatiusculis, striatis, superne 

 rugulosis ; apertura sub-circulari, superne subacuminata, 

 peritremate acuto ; umbilico mediocri ; operculo testaceo, 

 tenuiusculo, anfractibus septem, striatis. 



Shell nearly globose, rather pellucid, white, with a 

 thin, horny, fulvous epidermis ; spire short, obtuse, consist- 

 ino- of four rounded volutions, rather elevated near the sutures^ 

 striated and rugulose on the upper part ; aperture nearly 

 circular, acuminated posteriorly, with a sharp peritreme ; 

 umbilicus of middhng dimension : operculum testaceous, 

 thin, consisting of seven striated volutions. 



47. C. DisTiNCTUM. (pi. xxiv. f. 38.) nob. Bay of Mon- 

 tija, West Columbia; H. Cuming. 



