•390 



PROCEEDINGS OF THE ACADEMY OF 



[May, 



Micrarionta areolata ('Sowb.' Pfr.). PI. XVI, figs. 25 to 33. 



Helix areolata Sowb. ms., Pfr. Zeitschr. f. Malak., II, p. 154, 184.5; in Philippi, 

 Abbildungen, etc., II, p. 184, pi. 9, f. 4; Conchylien Cabinet, p. 248, pi. 36, 

 f. 10-13. Crosse and Fischer, Miss. Sci. Mex., Moll., p. 262, pi. 11, f. 4. 



Epiphragmophora areolata (Sowerby) Dall, Proc. A. N. S. Phila., 1900, p. 100. 



Helix areolata was described by Pfeiffer from specimens brought 

 liome by Hinds, with no more informing locaUty than ''California." 

 In a later publication he adds " on the Columbia River in California. " 

 Several places visited by Hinds on the Sulphur along the coast allow 

 a wide range of choice for the type locality: San Quintin Bay, 

 Cerros Island (where no shells seem to have been collected by Hinds) , 

 Turtle (Bartolome) Bay, and Magdalena Bay, where several days 

 were spent. 



Fig. 2. — a, b, c, type of Helix areolata; d, H. areolata, variety, 

 graphically from the Conchylien Cabinet. 



Copied photo- 



Pfeiffer described it as having the columella unidentate," diam. maj. 

 ^6, min. 23, alt. 18 mm.^ 



The specimen measured, presumably considered the type, was 

 figured by Philippi (Abbildungen, etc.) and again in the Conchylien 

 Cabinet, pi. XXXVl, figs. 10-12. These figures are copied photo- 

 graphically in text-figure 2 a, b, c. 



Reeve and Crosse have figured specimens of the tessellated Magda- 

 tena Bay form, and some in the Academy Museum, received from 

 Sowerby many years ago (pi. XVI, fig. 4) are of the same rather 

 •depressed race, and agree well with Pfeiffer's figures, though neither 



6 Pfeiffer later qualified this by the expression "pkrumque unidentato," and 

 in the Conchylien Cabinet he says the columella of the type is "iindeutlich ein- 

 zdhnig," and recognizes two varieties: "Variety 1. Smaller, more globose; 

 umbilical perforation almost closed; columellar tooth distinct and strong, fig. 13. 

 Variety 2. With the columellar tooth entirely wanting." 



' Pfeiffer measured the altitude of HeHces along a line parallel to the axis of 

 the shell, and not to the base of the lip, as is now done. By the modern system 

 it would be 22 mm. high. 



