OF CONCHOLOGY. 107 



B. eliceans is well represented in Reeve's figure, Mon. spe- 

 cies 16, which is misnamed Pyrida aruanum, and also in Chenu's 

 figure with the same name. Manual, vol. ii, p. 180. 



For good figures of B. carica, see Encyc. Method, pi. 433, fig. 

 8 ; Lister, t. 880, fig. 3 ; Gaulteri, pi. 47, fig. B. 



MODULUS, Gray. 

 M. Floridanus, Conrad.— PL 12, fig. 6. ' 



Description. — Suborbicular, whorls 5, channelled at the su- 

 ture; penultimate and last volutions with transverse nodular ribs; 

 a revolving rib at the base of the whorls of the spire, slightly 

 nodular and continued on the last volutions below the transverse 

 ribs ; shoulder rounded ; revolving ribs of last whorl 8, rounded, 

 slightly nodular ; white, with black spots ; columellar tooth ob- 

 lique, perfectly straight, tinged with purple ; umbilicus small ; 

 columella concave, purple ; operculum round, concave. 



Locality. — Florida. 



This pretty species is smaller than M. lenticular is, Chemn., 

 and differs most obviously in having a rounded shoulder, more 

 numerous and smaller transverse ribs, and a round operculum. 

 The last whorl has conspicuous transverse wrinkled lines between 

 the ribs. The transverse ribs are small and numerous, and be- 

 come obsolete towards the aperture on the last volution. It may 

 possibly be a variety oi M. imidens, Lister. 



CYRENA. 

 C. PROTEXTA, Conrad. — PI. 12. ficr. 3. 



Bescription. — Longitudinally cuneiform, very inequilateral, 

 thin in substance, elongated, anteriorly ventricose, posteriorly 

 folded or contracted from the umbonal margin, behind the apex, 

 obliquely to ventral margin, which is emarginate in that part ; 

 posterior extremity narrowed and obtusely rounded ; prominent 

 concentric lines on the umbo ; summit prominent, color white, 

 tinged with brown towards the posterior ventral margin and pos- 

 terior extremity ; within white, dark purple towards the posterior 

 end. 



Locality. — Tampa Bay. 



This species is longer than O. Floridana, and may be readily 

 distinguished by its whitish exterior and posterior dorsal line 

 straight to the extremity, as well as by its longer outline, more 

 prominent beaks, and less ventricose form. The palleal line has 

 a very short, sharply angular sinus. Several living specimens 

 were obtained by Mr. Stearns. 



