138 BULIMULUS-ORTHOTOMIUM. 



Bulimulus (Globulw) recognitus MAB., Bull. Soc. Philom. (8), 

 viii, p. 69. 



B. PILULA (W. G. Binney). PI. 25, fig. 57. 



Shell globose, inflated, umbilicated ; thin ; with longitudinal 

 wrinkles; chalk-colored; apex obtuse; whorls 4, convex, the last 

 very inflated, equalling ten-elevenths the length of the whole shell ; 

 columella simple, arched ; aperture oblique, rounded ; peristome 

 simple, acute, its columellar end expanded so as to partially cover 

 the umbilicus. Length 22, breadth 7 mill. ; aperture 9 mill, long, 

 6 wide. (Binney). 



Lower California : Todos Santos Mission and Margarita Island 

 (Xantus), the type from the former locality. 



Bulimulus pilula "W. G. B., Proc. Acad. Nat. Sci. Phila., 1861, p. 

 332, fig. PFR., Monogr., vi, p. 126. Bulimulus (Mormus) pilula 

 BINN. & BLD., Land and Freshwater Shells of N. A., i, p. 206, f. 

 357. Bulimulus ( Orthotomium /) pilula DALL, Proc. U. S. Nat. 

 Mus., xvi, 1893, p. 646, pi. 72, f. 10. Not Mormus pilula Tryon, or 

 Bulimulus pilula Crosse & Fischer and Cooper. 



While stating that the original types of B. pilula are distinct from 

 the form so-called by Cro&se and Fischer, Dall has unfortunately 

 neglected to point out what the differences are. 



Xantus collected both the types and the form now called cooperi. 

 One of the original lot collected by him, received through Binney, 

 is shown in fig. 35 of pi. 18. Another specimen bleached perfectly 

 white, also received from Biuney, labelled Margarita Island, is shown 

 in fig. 34 of the same plate. Binney made no distinction between 

 the two forms, and as Tryon, Crosse and Fischer and Cooper all 

 selected the "cooperi' form, which agrees well when bleached with 

 Binney's description and first figure, it would have been better to 

 restrict the species pilula to that form. Binney's measurements are 

 of course wrong ; perhaps the "Long. 22 " was meant for 12 ; but 

 even then the assigned diameter seems too small. 



The figure is copied from Binney's engraving of 1869. 



Dall writes : The types of this species in the National Museum 

 have a distinct and mature appearance. The specimens connecting 

 them with sufflatus are usually young sufflatus. The two types have 

 4 and 4? whorls, respectively, as many as specimens of sufflatus four 

 times their size. The nuclear whorls are smaller than in sufflatus 

 and more delicately sculptured, while the incremental wrinkling on 



