OP CONCHOLOGY. 13 



Mr. Morse separates H. chersinn from H. fulva, H. minuta, 

 Say, from II. pulcJtella, Zua luhricoidea, Stimp., from Z. lubrica. 

 But we think his reasons, though suggestive, are not conclu- 

 sive. 



For S. minutissima, Lea, Mr. Morse makes the genus Punc- 

 tum and the sub-family Punctinie^ based on " the peculiar con- 

 formation of the buccal phite, divided by sixteen distinct pieces, 

 and the character of the lingual dentition, corresponding closely 

 with Garychium exiguum.'''' 



A full description and embryology of the much vexed Selix 

 harjM, Say, is given ; it is made a genus, Zoogenetes in the sub- 

 family Pupinse. 



Limnea decollata^ Mighels, Mr. Morse believes to be identical 

 with L. catascopium, an opinion which we cannot share with 

 him. L. ampla is shown to be very rare and probably local. 

 " Found a few dead specimens in Mud Lake, at the northern 

 part of the State, the original place of discovery." 



Pltysa heterostropha deprived of air by being placed in a 

 small vial filled with water, survived the deprivation seven- 

 teen hours. Limnea desidiosa, under like circumstances lived 

 about seven hours. 



Ancylus ovalis and A. lorealis^ two new species, are des- 

 cribed and figured. 



Mr. Morse enumerates in all, 49 land and 55 fresh water 

 shells, total 104 species, which is actually a larger number than 

 inhabits Ireland, a somewhat larger country, and much larger 

 proportionally than England. In the last two countries the 

 terrestrial forms predominate, so as to make three-fifths of the 

 species, while in Maine more than half are fluviatile. 



The remarks on the abundance or rarity of certain species 

 as compared with the data given by Dr. Mighels in his Cata- 

 logue published twenty years ago, does not appear to us to 

 serve any useful purpose, except to suggest that such remarks 

 applied to species as " very abundant," " rare," &c., ought to 

 be received with great distrust. 



The text to this volume is followed by 10 plates, principally 

 devoted to dentition. One of them exhibits magnified views 

 of the surfaces of several small Helices. 



This work may be obtained of the author for $1.50, we be- 

 lieve, a price that will never repay him for the laborious produc- 

 tion of the magnified figures which adorn it. 



Check List of the Invertebrate Fossils of North America, 

 Miocene : by. f. b. meek, CSmithsonian Miscellaneous Col- 

 lections, Nov. 1864.) 



An exceedingly useful index to our Miocene MoUusca. 



Prof. Meek has enumerated over 700 species. American 



Palseontologists may congratulate themselves upon the pos- 



