184 STROMBINA. 



chestnut lines, external lip-margin chestnut, interior of aperture 



pale violaceous. Length, 12-15 mill. 



Panama, Galapagos Is. 



C. GIBBERULA, Sowb. PI. 60, fig. 90 ; PL 63, fig. 71. 



Body-whorl with callous humps on the back and side ; these 

 are white, the rest of the surface having a reticulation of chestnut 

 lines on a yellowish white surface ; lip varicosely thickened exter- 

 nally, smooth or slightly crenulated within. Length, 12-16 mill. 

 W. Coast of Central America; Payta, Peru (d'Orb.). 



C. CALLOSIUSCULA, Tapparone-Canefri. 



Shell fusiform, solid, shining, luteo-corneous, marked with 

 chestnut, subpellucid ; whorls irregularly longitudinally strigate 

 or subcostulate, the last gibbous and callous on the back, sulcate 

 at the base; lip thickened and white externally, slightly dentate 



in the middle internally. L. 9, cliam. 3'66 mill. 



Papuan Islands. 



Unfigured. Closely allied to the preceding, but smaller, nar- 

 rower, without side callus, etc. 



C. ALBERTISII, Tapparone-Canefri. 



Resembling the preceding species, but larger ; luteo-corneous, 

 with an articulated zone of chestnut and white at the suture, and 

 two narrower chestnut zones below, marked longitudinally with 

 irregular, interrupted chestnut lines. L. 11, diam. 4 mill. 



Papuan Islands. 



Unfigured. Somewhat larger and differently colored from C. 

 callosiuscula. 



C. CLAVULUS, Sowb. PL 60, fig. 89. 



Shell yellowish white, with zigzag or reticulated markings of 

 chestnut or chocolate ; outer lip externally greatly thickened, 

 the posterior canal sometimes in advance of the posterior end, 

 this displacement apparently caused by a callous thickening of 

 the hind part of the parietal wall. Length, 23 mill. 



Bay of Montija, W. Coast Centr. Am. 17 fms. (Guming). 



Described as a Pleurotoma, but the position of the sinus 

 appears to be merely accidentally displaced by the development 

 of the callus. I am somewhat doubtful whether this is really 

 distinct from the next species. 



