Atry. 



54 



Vi^n. 



Atrypa chemungensis. Vanuxem, page 182, fig. 49, 4, 



yiU ^I. „,. ^ , VIII g, 



Chemung 

 formation. 

 (See Con- 

 rad, 1842, 

 Jour. A. N. H. Phila., Vol. 8.— This 

 is the largest Atrypa in middle New 

 mw«m^ York ; but the casts of it are more nu- 



Vamvu^"^'""'*'™"' 49 '"^ merous than the shells themselves. 



Atrypa concentrica. See Athyris spiriferoides. VIII g- 

 Atrypa concinna. See Nucleospira concinna. VIII c. 

 Atrypa congesta. See Camarella congesta. Y a. 

 Atrypa consimilaris. See Atrypa reticularis. VIII a, 

 Atrypa contr acta. SeeStenoschismacontractum. VIII g. 

 Atrypa Giiloides. See Rhynchonella venustula. VIII d 

 Atrypa Guneata, See Rhynchonella cuneata. F5. 

 Atrypa diihia. See Rhynchonella dubia. II h. 



Antrypa dumosa. Hall, page 271, figs. 124, 1, la; lb 



(a cast). Chemung 

 formation. VIII g, 

 Dumosa means hushy^ 

 in reference to its nu- 

 merous spines ; but 

 [JM^aH, ±a. the shells of this spe- 



cies found abundantly along the Chemung 

 river, on Cayuta creek, at Elmira, &c., 

 have usually lost their spines and look 

 scaley, so that Prof. Hall at first named 

 the species Atrypa squamosa. The cast 

 of the interior of the flat valve is punc- 

 tured all over, except on the scar, which 

 is finely striated lengthwise, as shown in 

 the figure, 1 b. 

 Hall. !2A.it 



Atrypa duplioata. See Stenoschisma duplicatum. VIII g. 

 Atrypa elongata. See Renssellseria ovoides. VIII. 



