1818.5 ^^^^ SPECIES OF FISHES. 235 



ded at the extremity; anal subequal, narrow, somewhat 

 elon^ted; lateral line obsolete; back and head of a deep 

 blue, with yellowish tints; sides and abdomen of pale blue; 

 pectoral^ ventral, anal and caudal fins slightly blended 

 with a reddish green; opercula varied with yellow, red 

 and violet; iris reddish, pupil black. 



Scales of a middle size, readily falling off. 



B. 7.— D. 19.— P. 18.— V. 9.— A. 18.— C. 22| rays. 



We observed this in October, 1816, on the coast of 

 Marblehead and Sandy Bay, under the name of English 

 Herring, which the fishermen have given to it, doubtless 

 from a resemblance it bears to the Pilchard, from which it 

 differs in having a straight dorsal fin, without emargina- 

 tion, as in the Pilchard. Taken with the seine, and cured 

 ibr home consumption. 



(To be continued) 



An Account of the Crustacea of the United States* By 

 Thomas Say. Read November 11, 1817. 



(Continued.) 



£Slnce these papers were read to the Academy, we have found, in tlte 

 southern states, several interesting- and apparently new crustaceous animals, 

 descriptions of some of which will now be added, and those of the remaining 

 ones will form a supplementary addition to this essay; this notice is only given 

 to account for the anachronisms that may appear.] 



Genus PEN^US. 

 Three anterior pairs of feet didactyle, the anterior 

 pair shortest; interior antennce inserted above the line of 

 the exterior ones, which have a large scale attached to the 

 peduncle; tail with the middle process elongate- triangu- 

 lar, broader at base. 



