74 NEW- YORK FAUNA — MOLLUSCA. 



LlMNEA JUGULARIS. 



PLATE V. FIG. 81. 



(STATE COLLECTION.) 



L. jugularis. Say, Nich. Enc. Ed. Am. 



L. stagnalis. Kirtland, Am. Jour, of Sci. Vol. 31, p. 35. 



L. jugularis. Haldeman, Monog. Limniades, p. 16, pi. 4, figs. 1, 2. 



Description. Shell large, thin, ventricose, smooth and diaphanous. Whorls six, slightly 

 convex : incremental lines distinct. Spire regularly attenuated to an acute tip, rather shorter 

 than the aperture. Aperture large ; inner side subrectilinear ; outer margin slightly expanded. 

 Columella with a deep fold. No umbilicus, the last whorl being in close contact with the 

 pillar-lip. Color, light ferruginous. 



Length, 10 -2-0. 



This and the following (if they are not identical) are the largest species of the genus. I 

 have received them from Lake Champlain and Canandaguia lake. They occur in Michigan, 

 Northwest territory, and Lewis river, Oregon. 



LlMNEA APPRESSA. 



L. appressut. Say, Jour. Acad. Not. Sci. Vol 2, p. 168. 

 L. id. Adams, Am. Jour, of Sci. Vol. 40, p. 267. 



L. id. Haldeman, Monog. Limniadse, p. 18, pi. 5, figs. 1, 4. 



Description. Shell elongated, ventricose. Whorls six. Spire regularly attenuated to an 

 acute tip, which, as in the preceding, is rather shorter than the aperture. Body-whorl pro- 

 portionally large. Aperture ample. Columella with the sinus of the fold profound. Callus 

 perfectly appressed upon the shell to the base. 



Color. Pale ferruginous, frequently stained with a black foreign matter. 



Length, 1-0-1.5. 



This species agrees so well in all its characters with the preceding, that it would be 

 difficult to point out their specific comparative differences. The body-whorl of the present 

 species appears to be more ventricose than in the preceding, the outer lip more expanded 

 and dilated, and the apicial whorls are occasionally darker. None of these are confessedly 

 sufficient to create specific differences. In Dr. Budd's collection, I have observed a speci- 

 men which might be referred to this species, 2'1 long, and its aperture 1*1. Specimens 

 have been obtained by me from Cayuga and Champlain lakes. 



