32 



Observations on the Terrestrial 



not however give these 

 characters as distinguishing 

 features between the two 

 species, believing that a 

 faithful examination of the 

 Fig. 84. Fi(j. 83. soft parts will reveal cer- 



tain specific differences which may then be recognized in the 

 shells. 



bi 



PUPINJE. 



Zoogenetes. xov. gen. 



Based upon its ovoviviparous character, the crenulated disk, the 

 prominent labial palpi, and the turreted, costulated, nearly corn- 

 eous shell. The species harpa on which this genus is based, is 

 placed in the sub-genus Acanthinula of Beck by Albers. The two 

 European species H. lamellata and H. aculeata included in Acan- 

 thinula, are both much smaller than Z. harpa. A. latnellata bears 

 no resemblance to harjxi, and though aculeata is more like harpa^ 

 yet the enlarged outline of the head of aculeata^ as given by 

 Moquin Tandon, a fac-simile of which is here presented, is quite 

 dissimilar to the same portion in Z. harpa, Moqurn 

 Tandon does not even show the labial jialpi in his 

 drawing, though he thus speaks of the palj)i and 

 " Tentacula inferiora et palpi lahiales sat magnar 

 In Z. harpa the inferior tentacles are nearly obsolete, and as no 

 mention is made of the borders of the disk being crenulated, 

 and of the ovoviviparous character, I must regard Zoogenetes 

 as a distinct srenus from Acanthinula. 



tentacles. 



Zoogenites harpa, Say. {Plate 1, Fig. 1, 2, 3.) 



This singular species is very common in the vicinity of Port- 

 land. I have also found a few specimens at Bethel, on the An- 

 droscoggin River, at Waterville, on the Kennebec River, and at 

 Berlin Falls, N. H. It is a very hardy species, as will be seen by 

 the following data furnished me by John M. Gould, Esq. 



