172 PHASIANELLA. 



ing impressed lines; spire conic, the upper whorls sometimes cariuate 

 or biangulate from the prominence of one or more of the revolving 

 stride; last whorl obscurely angular around the lower part, some- 

 times rather acutely carinate above the periphery; aperture less 

 than half the length of shell, rounded ovate, columella arched, 

 scarcely thickened ; umbilical region deeply grooved and narrowly 

 umbilicate ; color white, -sparsely punctate with red, more or less 

 flammulate longitudinally with red and white. Alt. 5 mill. 



Cuba; Florida. 



The revolving striae are entirely wanting on some individuals. 

 There is great variation in the degree of exsertion of spire, some 

 shells attaining a length nearly double that given above. 



The more stable characters of the shell are its narrow but decided 

 umbilicus, and the very convex whorls. 



D'Orbigny described the smooth form of this species, as will be 

 seen by his diagnosis translated below: 



"Shell elongate, thin, smooth, umbilicate, punctate with red, 

 maculate with red and white; spire elevated, apex acute, whorls ~>, 

 convex, separated, the last anteriorly subangulate ; aperture oval." 



P. PEKFORATA Phil., 1848. PI. 38, fig. 62; PL 39a, % 12. 



"Oblong-conoid, perforate, white, subtessellated with oblique pur- 

 ple lines; suture and periphery ornamented with large maculationa 

 of white and purple ; whorls deeply convex, last subangulate ; aper- 

 ture oblong ovate, equal to spire." 



Payta, Panama; Mazatlan. 



"This beautiful shell closely resembles the West Indian species- 

 Like many of its congeners, it has parallel diagonal lines of red and 

 brown. The first whorl of the five is discoidal. It is characterized 

 by extremely minute wrinkling over the whole surface, only dis- 

 cernable under the microscope when quite fresh. The umbilicus is 

 very large when young, and sharply keeled ; when adult it is often 

 nearly filled up by the callous labium. Operculum radiately 

 wrinkled over a large part of the outer surface; within spire pro- 

 duced, sharply keeled. The largest specimen measures: Alt. '!>, 

 diarn. '12 in." (Carpenter.*) 



My figure on plate 38 is a copy of that given by Reeve. On pi. 

 39o, Philippi's figure is reproduced. 



