LYMISLEID^E OF NORTH AMERICA. 395 



RECORDS. 



MICHIGAN: Fish Point, Saginaw Bay, Tuscola Co. (Davis; Walker). 

 GEOLOGICAL DISTRIBUTION : Unknown. 

 ECOLOGY: Not recorded. 



f V ; 7\.- t * ' ; * / <f ly fc { I r [ r * . ; .- -, v ; r';-/ t "' ft ? ' ' ' * t >* ' ' ' ' ** 



REMARKS: Of this species Mr. Walker says: "This species is 

 well characterized by its large, ovate body whorl and its very acute 

 spire; the apical whorls are flattened and the straight line of spire is 

 prolonged over the upper part of the body, giving a 'pot-bellied' ap- 

 pearance to the shell." 



This is a peculiar little species, unlike any other. Its very acute 

 spire, large body whorl and elongate-ovate aperture appear to be the 

 chief features, which easily distinguish it from catasc opium, its near- 

 est relative. "Named in honor of Prof. Charles A. Davis, of Ann 

 Arbor, its discoverer, in recognition of the many valuable contribu- 

 tions he has made to our knowledge of the distribution of the Mollusca 

 in Michigan/' (Walker). 



Galba pseudopinguis Baker. Plate XLI, figures 6-7; plate 

 X LI I, figures 9-13. 



^.Lymncea pseudopinguis BAKER, Nautilus, XXI, p. 54, Sept., 1907. 



SHELL: Elongate-ovate to subglobose, rather thin; periostracum 

 very light corneous, inclining to yellowish or brownish; surface dull to 

 shining, but not polished ; growth lines very heavy and spiral lines deeply 

 incised ; whorls five to six, rounded, the body whorl globosely inflated ; 

 the whorls increase very rapidly in diameter ; spire about as long as 

 the aperture, broadly conic, the whorls very rapidly increasing in 

 size; sutures well marked or deeply indented, bordered below by a 

 wide, yellowish band ; aperture ovate or roundly ovate, sometimes a 

 trifle expanded and somewhat effuse anteriorly ; inner lip rather broad- 

 ly expanded, triangular, reflected over but not closing the umbilicus 

 which is a conspicuous chink; the inner lip is much compressed and 

 dented at its junction with the body whorl, forming a slight plait ; 

 the parietal callus is very thin or wholly lacking. The axis is but 

 slightly twisted. 



Length. Breadth. Aperture length. Breadth. 

 9.00 6.50 6.00 3.50 mill. Crystal Brook. 



9.50 6.75 6.50 3.50 " " " 



8.25 5.50 5.40 3.00 " " 



14.00 8.00 8.00 4.30 " 



12.50 7.50 7.30 4.00 " " 



11.00 7.00 7.00 3.50 " " " 



18.00 9.25 9.50 4.00 " Canarsie. 



12.00 6.00 6.50 3.00 " 



7.25 5.00 5.00 3.00 " Mt. Sinai. 



7.50 5.00 5.00 2.50 " 



