1879.] ^"7 [Cooper. 



solitaria. The evidence from intermediate forms, is like that in the case 

 of the Ariontce, and yet the intermediate specimens are scarcely numerous 

 enough to determine them as mere varieties, while he finds the teeth differ 

 considerably. The fact that solitaria occurs as far west as near Vancou- 

 ver, W. T., and near the localities of strigosa, at the Dalles (which is 

 within the Central Province), without mixing, tends to prove distinctness 

 of species in some degree. Future investigation of climatic peculiarities 

 may determine the cause of some local variations. 



The Patula from Alaska referred by me to P. ruder ata with a (?), in 

 the Amer. Jour, of Conch., V, 202, was certainly not P. pauper Gould as I 

 at the time stated, and the diagnosis I gave then would distinguish them 

 perfectly, yet Mr. Binney assumes that the Asiatic species is the same ; 

 though differences exist between them nearly as great as between P. ida- 

 lioensis and P. altemata ! 



Macrocyclis Beck. 



It is not yet determined that the Chilian type of this genus {M. laxata) 

 is congeneric with our species, which may yet prove to require the name 

 MesompMx Raf (type concava according to Ferussac). 



On p. 90, Mr. Binney followed my former statement that M. ? vancou- 

 verensis did not extend S. of lat. 37°, though in Amer. Nat., Jan. 1873, I 

 stated that I found it common near San Diego, and I have seen specimens 

 from Central America, exactly similar (vellicata Forbes?). 



Zonites Gray, not Montfort. The original type of this genus, algira, 

 appears to be very distinct from the thin diaphanous species, belonging 

 to Hyalina Fer, though Omphalina Raf. (type cuprea-fuliginosus Griff., 

 MSS.), may possibly have precedence. 



Mr. Binney gives " Z. nitidus" as found at Astoria, Oregon (p. 114), 

 and " Z. cellarius" as from Astoria, N. Y. If no confusion of localities 

 has occurred, the former is just as likely to have been introduced on ships, 

 as the latter, and not to be really circumpolar. 



There appears to be an error, either in the dimensions given or the scale 

 showing size of " Z. stearnsii," p. 128. Other probable errors of this 

 kind occur in the book, among them a repetition on p. 360 of 31 millimetres 

 for 21, the actual breadth of the type fig. of A. redimita. The want of 

 a uniform scale of enlargement of minute species, is to be regretted. 



Ariolimax Morch. 



The figures given from alcoholic specimens have almost no value in 

 comparing the outlines of the species, as they vary much, according to the 

 degree of contraction of the animal, either when dropped in, or afterwards 

 on account of the variable strength of the spirits used to preserve them. 

 This variability also affects the form of internal organs, though in less 

 degree, but probably enough to account for some of the differences de- 

 scribed in viscera, though not those in jaws and Unguals. 



The figures given of A. liempJiilli and A. andersoni show only such 

 differences as can be found in a number of any one species put in alcohol 



