MOLLUSCS, VERMES AND HYDROZOA 



Jersey, the Delaware, Schuylkill and the Susquehanna. Common through- 

 out New England. 



C. ponderosus. Fig. 147, is the largest Eastern and Middle States 

 species but not as common as the foregoing. The i^ inch long polished 

 shell is globosely-ovate, very thick and heavy, with a roughened surface 

 showing very heavy 

 striations of growth; 

 of a greenish horn- 

 color with irregular- 

 ly disposed brown 

 and black streaks. 

 It has five or six 

 whorls, of which the 

 body whorl is equal 



to about four-fifths ^^^- '*^- Campehma povderoim. 



of the length of the shell, a short spire and a perfect apex, usually eroded. 

 The aperture is oval, narrowed above, slightly oblique, and about half the 

 length of the shell. The operculum is elongate-ovate with a thin margin. 

 The body is a dull brown, the tentacles thick and the eyes prominent and 

 black in color. It is ovoviviparous and is found in New York, the Lake 

 regions, Ohio, Indiana, Illinois, Michigan, Tennessee and Alabama. No 

 experiments with it in the aquarium have been reported. 



LioPLAx. These snails are similar to the foregoing but have parallel 

 sides, the front truncated and the posterior extremely obtusely rounded. 

 The shells are concoidal, elongated and thin, the apex pointed, and the 

 operculum with concentric rings. 



L. subcarinata. Fig. 148, is found in Pennsylvania, New Jersey, Ohio, 

 Kentucky and some other of the Middle Western States. The elongated 

 shell is ^ inch long, of a bright brownish-green color with brown trans- 

 verse lines of growth. 

 Of the five whorls, the 

 body whorl takes up 

 three-fourths of the 

 shell; the suture is dis- 

 tinct, the apex pointed 

 but often eroded, and 

 the aperture pear- 

 no. 148- Liopiax .uhcarinata. shaped. The Hncs of 



the operculum are concentric, and the body a dark grey dotted with orange. 

 It is ovoviviparous. Fine specimens have been taken from the Delaware 

 and Schuylkill rivers and their tributaries. This is the only species of the 



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