12 THE SPECIES OF 



and connected with a callus on the parietal wall ; throat 

 violet. 



Greater diameter, 26 ; lesser, 21 ; height, 14 millimetres. 



Geographical Distribution. Found by Mr. J. H. Thom- 

 son widely distributed in California. 



Remarks. It was with some hesitation that I proposed 

 a name for this shell. I at first considered it as a bandless 

 variety of Nickliniana Lea. But on expressing this opin- 

 ion to Mr. Thomson, he gave me the above description of 

 the animal and its habits, which are quite distinct from 

 those of Mr. Lea's shell. Its characteristics were found 

 constant at various remote points of the State, and in a 

 considerable number of specimens. They seem too great 

 for a simple variety. The animal is also different in its 

 habits from Nickliniana^ being found only solitary, while 

 the latter is gregarious. 



The shell is one of the very few bandless species of Cal- 

 ifornia. 



HELIX RETICULATA PFEIFFEK. 



T. umbilicata, globoso-depressa, solidula, oblique striata, striis subregu- 

 lariter antrorsum descendentibus oblongo-granulata, fulvida, fascia 1 rufa 

 peripheria cincta ; spira breviter conoidea ; anfr. 5 convexiusculi, ultimus 

 latus, rotundatus, antice non descendens ; umbilicus angustus, non per- 

 vius ; apertura diagonalis, rotundato-lunaris ; perist. crasse albo-labiatum, 

 marginibus distantibus, dextro vix expansiusculo, columellari declivi su- 

 perne dilatato, reflexo. 



Diam. maj. 22, min. 18, alt. Hi m ill. Hab. in California. 

 (Pfeiffer, Malak. Blatt. 1857, p. 87.) 



I have not seen this species. The above is Pfeiffer's 

 description. 



HELIX EXARATA PFEIFFER. 



T. umbilicata, conoideo-depressa, solidula, undique malleato-rugulosa, 

 lutescens, fascia 1 castanea cincta ; spira breviter conoidea, acutiuscula ; 

 anfr. 7 parum convexi, lente accrescentes, ultimus latior, rotundatus, 



