374 Miscellanies^ 



whorls of the spire. The entire want of granulations distinguishes 

 it from the common type of the species. It is distinguished from the 

 Murex tubercularis, Mont., by the same character. 



2. Planorbis virens. P. testa parva, viridi, striis transversis 

 crebris revolventibus tenuissimis ; anfractibus quatuor; spira baud 

 prominente; vix concava ; anfractu ultimo superne sub-planulato ; 

 inferne sub-carinato ; labro superne prominente ; umbilico subulate 

 profundo. Habitat New Bedford. 



Remarks. — This species differs from P. parvus, Say, in being much 

 less broadly and more deeply umbilicate beneath ; it is also higher. 

 P. parvus instead of being subcarinate on the lower side is much flat- 

 tened. P. concavus, Anthony MSS., resembles this species, but is 

 more convex above and concave beneath. 



• 3. LiMNEA ACUMINATA. L. testa fragili, semitransparente, ovata, 

 striis transversis irregularibus revolventibus creberrimis parallelis ; 

 anfractibus quatuor ; spira perbrevi, subacuta; anfractu ultimo max- 

 imo ; apertura amplissima, spirae interiorem ostendente ; columella 

 tenui subreflexa ; labio baud appresso. Habitat New Bedford. 



Remarks. — This differs from the L. columella, Say, in the much 

 greater proportional size of the last whorl, the breadth of the shell 

 and the presence of very distinct revolving lines. It resembles the 

 Succinea obliqua. Say, but the spire is rather less, and no revolving 

 lines are mentioned in the description of that species. The L. acumi- 

 nata has also been found at Horn pond, in Woburn, Mass., by T. J. 

 Whittemore, Esq. 



4. LiMNEA uMBiLicATA. L. testa fusca, ovata, striis transversis 

 revolventibus tenuibus ; anfractibus quinque convexis ; sutura perim- 

 pressa ; spira subacuta; anfractu ultimo subgloboso ; apertura ovata 

 dimidio longiore qnam spira; labro intus fusco marginato, punicea 

 albo submarginato ; columella late reflecta, obsolete plicata; umbili- 

 co subamplo baud profundo. Habitat New Bedford. 



Remarks. — For this and the second species described above. Prof. 

 Adams is indebted to Mr. Shiverick. The L. umbilicata resembles 

 L. caperatus of Say, but in the latter the aperture is about one half 

 the length ; revolving lines are raised, more distinct and numerous ; 

 umbilicus is rather less, and there is one more whorl. 



5. LiMNEA PALLIDA. L. testa ovata fusiform! pallida ; anfracti- 

 bus quinque ; sutura irapressa, spira conica subacuta ; anfractu pos- 

 tremo producto ; apertura superne acuta, baud magna ; umbilico par- 

 vo. Habitat Shoreham, Vt., on shores of Lake Champlain, clinging 

 to rocks and stones. 



Remarks. — This species most resembles L. acuta, Lea ; it differs 

 from it in being long, striate, and of a pale brown color, like the 



