CERION, GROUP XI. 263 



parietal ridge, even reaching it in some individuals. Length 22-29 

 mill. This form is Maynard's S. pilsbryi evolva (pi. 43, fig. 65). 

 Intergrades with the blue-white shells of the other end of the key 

 occur. Very small specimens, length 15^ to 23 mm., were found by 

 Mr. Maynard on a small tree and the immediately adjacent bushes, 

 standing in a sandy tract about midway of the western portion of 

 Goat Key, midway of the range of S. p. evolva. These dwarfed 

 specimens, of which 75 were found, he has named S. restricta (pi. 43, 

 figs. 66, 67). They vary from the blue-white tint of pilsbryi, to 

 copiously mottled. Mouth dark inside. It is merely a colony of 

 stunted Individuals, with no other difference from the larger shells of 

 the islet. 



This series from Goat Key intergrades completely with one form 

 or another of S. glans Maynard (not Kiister), and S. bimarginata 

 Maynard. 



Form from Gun Gay. 



Specimens collected by Dr. Wm. H. Rush (pi. 43, figs. 68, 69) 

 are cylindric, moderately solid, sculptured with rather narrow riblets, 

 21 to 26 on the penultimate whorl. The parietal callus is thick and 

 somewhat elevated, or moderate and appressed. The lip is reflexed, 

 recurved, thickened and beveled ; parietal lamella slender, rather 

 small. They vary from white to copiously mottled, and are almost 

 exactly like some specimens from the cemetery between Nassau and 

 Waterloo pond. This is the most remote colony of 01 glans yet 

 known. 



C. BLA.NDI Pilsbry & Vanatta. PI. 44, fig. 81. 



Shell solid and strong, cylindric-tapering, the latter 3 whorls ap 

 preaching equality in diameter, those above slowly tapering to form 

 a long cone, gradually passing into the cylindrical portion. Light 

 grayish, with inconspicuous white flecking. Whorls 10, the nepionic 

 1\ corneous, smooth, the following 2^ weakly, distinctly ribbed, later 

 4^ to 5 whorls very sharply and roughly, strongly ribbed, ribs narrow 

 and high, 19 to 22 on each of the two or three later whorls. Um- 

 bilicus compressed, rimate, the area behind columellar lip excavated, 

 smooth, Aperture ovate, white within; peristome reflexed and re- 

 curved, its face not thickened ; parietal callus heavy, forming a 

 strong bar across the space between lip ends. Parietal tooth median, 

 moderately strong. 



