MACROCERAMUS. 113 



a little convex, slowly enlarging, sculptured with close, very 

 oblique, raised striae ; the penult, whorl a little wider than the 

 last. Aperture nearly circular; peristome pale, moderately 

 thin, the margins converging, columellar margin reflexed. 

 Length 6, diam. 2.5 mm., aperture 1.5 mm. wide (Smith). 



Buen Ayre (Hartert). 



Pineria bonairensis E. A. S., Proc. Malac. Soc. Lond., iii, 

 p. 114, f. 1 (Dec., 1898). 



" The minute thread-like lines which cover the surface of 

 the shell are very oblique, and extend even to the apical 

 whorls. One specimen only was obtained. Allied to Pineria 

 beathiana Poey, from the Isle of Pines, but more finely sculp- 

 tured, with less convex whorls, a larger apex to the spire, a 

 narrower body-whorl, and differs in the reflexion of the colu- 

 mella." (Smith.) 



It is likely that this species will prove, when the dentition 

 is examined, to be a Microceramus. W. G. Binney has exam- 

 ined the teeth of a species from Curacao, finding them to be 

 of the M. gossei type; and his identification of the shell as 

 M. inermis Gundl., while doubtless erroneous, indicates a 

 species not unlike P. bonairensis. 



Genus MACROCERAMUS Guilding, 1828. 



Macroceramus GLDG., Zoological Journal, iv (Oct., 1828), 

 p. 168, type and sole species M. signatus. ALBERS, Die Hel., 

 1860, p. 269 (in part). FISCHER & CROSSE, Miss. Scient. 

 Mex., i, p. 416. PFR., Nomencl. Hel. Viv., p. 271. Lepto- 

 spira SWAINSON (in part), Malacology, 1840, p. 335, for striata 

 Sw. (=0beliscus calcarea Born), and signata (==M. sig- 

 natus Gldg.). Colobus ALBERS (in part), Die Heliceen, 

 1850, p. 177. Bulimus sp., PFR., Monographia Helic. Viv., 

 ii, iii, and of Reeve. CoModina, Ire groupe Pupoides, 

 Ferussac, Tabl. Syst, p. 61. 



Shell shortly rimate, conic-turrite or oblong, always strongly 

 tapering above, composed of 9 to 14 whorls, or fewer by the 

 loss of 1 to 3 apical ones. The nepionic shell is composed of 

 about 2,1/2 smooth whorls, often crenate below the suture (pi. 

 15, fig. 5, M. signatus). The succeeding whorls are usually 



