84 



Mean divergence about 19°; length .53 inch ; breadth .125 inch ; 

 length of aperture .17 inch. 



AcHATiNA PERPLEXA. Shell ovatc-fusiform, much elongated: 

 almost transparent, pale yellowish brown, with transverse moderately 

 curved lines of dark brown, of which the last colors the labrum, three 

 to four on each whorl, wanting on the upper whorls, and scarcely per- 

 ceptible at and above the middle of the spire : with fine not crowded 

 transverse strise ; lines, which indicate the varices that are coincident 

 with the brown stripes, scarcely distinguishable from the striae : apex 

 subacute, Avith nearly one and one-half smooth whorls : spire much elon- 

 gated, with the outlines moderately curvilinear : whorls about six and 

 one-half, moderately convex, with a well impressed suture : aperture 

 long, ovate, quite narrow and acute above : columella a little twisted 

 scarcely truncate. This species closely resembles A. propinqua, but 

 the striee are finer and more distant, and the outlines of the spire are 

 more curvilinear. It attains about one-half of the size of that shell. 



Mean divergence about 21° ; length .33 inch ; breadth .09 inch ; 

 length of aperture .12 inch. 



[To BE Continued.] 



Through the the kindness of my friend T. Bland, Esq., of Jamaica, 

 I have been able to verify Mr. Chitty's observations on the opercu- 

 lum of Geomelania. It has a lateral apex, with one and one-half in- 

 ner whorls (in G. expansa), and many fine inequidistant strice on the 

 last whorl, which is otherwise smooth and shining. 



Cyclostoma aculeo&nm. (p. 2 of this work) is probiibly a variety of 

 C. Hillianum, with a more elevated spire. It is difficult to fix a limit 

 in their gradual passage .into each other. 



The next No. will contain species of Cyclostoma in continuation of the above ; 

 also descriptions of new land shells of Jamaica, which have just been received 

 from T. Bland, Esq., to whose industry and generosity I have been much in- 

 debted on various occasions : also the sjTionyniy of Helix picturata ; and 



more new marine shells of Jamaica. 



Feb. 1850. 



