SUPPLEMENT TO ISAAC LEA'S PAPER ON UNIONID^. 63 



differs in being larger, being cylindrical and having four bands, while fascinans 

 has but three. Neither of the two specimens before me is perfect in the upper 

 whorls, so that the character of the upper ones cannot be ascertained, nor can their 

 number. I presume there must be nearly ten. In the larger and more perfect 

 specimen there is a disposition to put on obtuse and indistinct folds. Aperture 

 more than one-fourth the length of the shell. 



Physa Carltonii. pi. 21, fig. 19. 



Testa Isevi, obtuse fusiformi, inflata, valde polita, tenui, subpurpurea ; spira excerta, acuminata; 

 suturis irapressis ; anfractibus senis, ultimo pergrandi ; apertura ovata, grandi ; labro expanso, 

 intus marginato ; columella impressa et contorta. 



Shell smooth, obtusely fusiform, inflated, very bright, thin, purplish; spire 

 raised, acuminate ; sutures impressed ; whorls six, the last very large ; aperture 

 ovate, large; outer lip expanded, margined within; columella impressed and twisted. 

 Proc. Acad. Nat. Sci., 1869, p. 125. 



Ha6.— Mount Diablo, California, W. G. W. Harford. 



My cabinet and cabinets of Mr. Harford and Academy of Natural Sciences. 

 Diam. -5, Length -9 inch. 



Remarks. — This is a remarkably fine large species, which I owe to Mr. Harford. 

 It differs from any I have seen from California in the color and size. The largest 

 specimen, which is slightly broken at the apex, is an inch long and more than half 

 an inch wide. A specimen two-thirds grown is entirely perfect and presents a very 

 graceful form. These specimens have generally two longitudinal bands of growth. 

 These bands are strongly marked with two colors, dark brown and light salmon. 

 The color of the shell is peculiar, approaching to a purplish mahogany color. 

 There is no species from the Pacific States which this can be confounded with 

 except Lordi, Baird, which is figured in the Smithsonian Miss. Col., Part II. p. 76, 

 by Mr. Binney. I have specimens of Lordi which difter in being less inflated as 

 well as in color. These shells were found in a creek in the vicinity of Mount 

 Diablo by Mr. H. P. Carlton, and were given to Mr. Harford, who kindly sent them 

 to me. I name the species after Mr. Carlton. 



Physa Wolfiana. PI. 21, fig. 20. 



Testa subrotunda, valde inflata, polita, tenui, tenebroso-cornea; spira valde obtusa; suturis impressis; 

 anfractibus quaternis, ultimo pergrandi; apertura ovata, grandi; labro expanso ; columella medio 

 parum impressa et parum contorta. 



Shell subrotund, very much inflated, bright, thin, dark horn color ; spire very 

 obtuse ; sutures impressed ; whorls four, the last one very large ; aperture ovate 



