168 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



The animal is described by Morse as bluish- whi'e, with head, neck, and 

 eye-peduncles mottled by streaks and dots of bluish-black ; disk yellowish- 

 white. 



Jaw but slightly arcuate, of uniform width throughout, long, narrow, 

 ends blunt ; anterior surface with coarse striae, not modifying the con- 

 cave margin, which has an obtuse, wide, slight median projection (p. 154 

 Fig. 61). 



Lingual membrane (PL IV. Fig. C). Morse gives 77 rows of 13 1 13 

 teeth; 6 perfect laterals. I counted 11 1 11, with 5 perfect laterals. The 

 reflected portion of the central teeth is quite small. The marginal teeth are 

 like those of Pupa. 

 . Genitalia not examined. 



DOUBTFUL SPECIES OF PATULA. 



Palula Mazatlanica. I do not believe this species can really exist at Lone Moun- 

 tain, San Francisco County, California, as asserted. See L. & Fr.-W. Sh., 

 I. 82. 



Patula incrustata is a Microphysa (q. v.), as is also 



Patiila vortex (q. v.). 



Hdix tenuistriata, BINNET, is also a Patula. It is an unknown species. The 

 following description is copied from manuscript of Dr. Binney : 



Shell flattened, the upper surface acutely carinated ; epidermis light horn-color ; 

 whorls 7, narrow, increasing in width very gradually from the apex to the aper- 

 ture ; striated with fine, prominent, distinctly separated, curved lines ; aper- 

 ture angular, depressed, contracted ; peristome above the carina acute, below 

 a little reflected ; base subconvex, smooth ; umbilicus open, moderate in size, 

 exhibiting 2 or 3 volutions. Greatest transverse diameter about an inch. 



Found hitherto only in the eastern part of Tennessee, whence a single specimen 

 was brought by Mr. Haldeman. This pretty species is described with some 

 reluctance from a single specimen, as it may be considered doubtful, until 

 another be found, whether it may not be a foreign shell introduced by mis- 

 take among Tennessean shells. It is quite flat on the upper surface, rising 

 a little towards the apex ; the whorls, which are distinctly marked, are beauti- 

 fully striated with delicate prominent curved lines, which are crowded towards 

 the apex, and separated by a distinct interval on the outer whorl ; they termi- 

 nate on the edge of the carina, which is a little plaited by them, the base be- 

 low being smooth. The aperture is narrow, and marked by an angle at the 

 carina. The lip below the carina- has a distinct, though narrow reflection. 

 The umbilicus is moderate, conical, and rather deep, exhibiting about three 

 volutions. In Lamarck's arrangement it would be a Carocolla. 



Helix te.nuistria.ta, BINNEY, Bost. Journ. Nat. Hist. 1842, IV. Part I. cover, 

 p. 3. PFEIFFER, Mon. Hel. Viv., I. 432. W. G. BINNEY, Terr. Moll., IV. 

 118; L. & Fr.-W. Sh., I. 77 (1869). 

 Helix vortex, teste GOULD (non PFEIFFER), Terr. Moll., III. 34. 



Helix limitaris, G. M. DAWSON. Land and Fresh-Water Mollusca, collected 



