128 THE NAUTILUS. 



This is the best known form. Typically it is white above, 

 with two dark blotches behind the lip, but as often there is also 

 a narrow dark band a short distance below the suture, and 

 sometimes an interrupted one above the carina. The base has 

 a band, often split, near the periphery. Upper lip not expanded. 

 Lower lip reflected, white or faintly pinkish. Outlines of spire 

 concave. Length 17.4, diam. 19.5, or somewhat smaller. 



This form was collected by Blanchet in the environs of 

 Bahia. It appears to differ from typical bosciana only in color, 

 and its status as a subspecies is very dubious. It is probably 

 a mere color- form of bosciana. 



Hidalgo has figured another variety of bosciana, collected by 

 the Spanish Expedition around Rio Janeiro, which seems rather 

 out of the range of the species (Viaje al Pacifico, Moluscos, pi. 

 1). It is evident that the species has various local color-races, 

 about which we know very little at present. 



OXYCHONA PYRAMIDELLA (Wagner, 1827). 



This is a form having the general shape of bosciana, with two 

 bands above, one below the periphery of the last whorl. The 

 aperture seems to be produced outward in a narrower spout than 

 in bosciana, upper lip apparently not expanding, and the whole 

 lip rose-colored. The habitat given is the province of Bahia, 

 "in sylvis mediterraneis inter montem sanctum et flumen S. 

 Francisci." The figures are rather poor, and series of speci- 

 mens are needed to determine whether it is to be ranked as a 

 subspecies of bosciana or as a distinct species. 



OXYCHONA PYRAMIDELLA CURRANI Bartsch. PI. IV, fig. 1. 



See NAUTILUS for September, 1916, p. 53. Rio Grungugy, 

 Province of Bahia. Figures of the type of this handsome race 

 are now given. It differs conspicuously from blancheliana by 

 the more pinched keel, the longer external spout of the aperture, 

 more sinuous, broadly rose-bordered lip, and other features fully 

 described by Dr. Bartsch. The microscopic sculpture is the 

 same. It appears to be more elevated than 0. pyramiddla, with 

 somewhat diverse color-pattern. 



