Report on Organic Remains. 279 



EURYPTERUS REMIPES. 



No. 5. Is the impression of the head, and first abdominal 

 segment of this remarkable crustaceous animal, which I de- 

 scribed in the first volume of the Annals, and established on a 

 single specimen in the Cabinet of the Lyceum. This is the 

 second that has been discovered. It offers no appearance of feet 

 or branchial appendages. The reniform appearance of the eyes, 

 their situation, the outline of the head, and the shape of the 

 first segment of the abdomen in this specimen, corresponds en- 

 tirely with that already published. The animal is somewhat 

 larger, the length of the head being 1*5, and its breadth near the 

 abdominal segment 2*1. It is highly satisfactory, as con- 

 firming us in the propriety of having established a new genus 

 for its reception. We are indebted to Mr. S. Davies of this 

 city, for the specimen. He obtained it from the vicinity of 

 Lake Erie. The impression is in a gray limestone, and it is 

 highly probable, that our very extensive secondary region 

 will furnish us with many new fossil genera, more particularly 

 among the Crustacea. While upon this subject I would ob- 

 serve, that Professor Desmarest in his remarks on the Euryp- 

 terus, (in Ferussac's Bulletin, Feb. 1S27.) seems to consider 

 the specimen from which the description was first made as 

 being in very bad preservation. The idea was suggested 

 from the mistake made by a previous writer as to its nature. 

 This error is, doubtless, to be attributed to the fact, that a 

 thin coating of earth may have then concealed its distinctive 

 characters. The specimen was certainly far from being per- 

 fect, but the engraving gives an exact representation of it. 

 They have been carefully compared together by many 

 naturalists, (among whom I may refer to M. Jacquemont of 

 Paris,) and they all testify to the fidelity of the engraving. 



