44G APPENDIX TO CRUSTACEA. [^eceraber, 



obsolete ones on the outer tip; hands with a strong spine 

 at base and five elevated, granulated lines, one of which 

 terminates in a short spine at the base of the thumb; 

 fingers with impressed lines and incurved at tip; pectus 

 white; c/^e<?/t^ pubescent; a6flro;;2CM, second segment mu- 

 cronate each side, third, fourth, fifth and sixth segments 

 in the female, reddish yellow at base. 



Length two and a half, breaddi four inches, nearly, 

 exclasive of the elongated spines. 



Resembles L. kastata, but is at once distinguished 

 from it by colour, by having four small teeth to the cly- 

 peus, a spine each side of the second abdominal segment, 

 armed carpus and many other differences; from L. pela- 

 gica, to which it also approaches, it differs in colour, in 

 having only three spines on the third joint and the ante- 

 rior feet, he. But it seems to be more closely allied to 

 L, reticuiatusi it however differs much from the figure 

 given of tliat species. 



The above description was taken from the dead sub* 

 ject. I have not seen a living specimen. 



Genus CANCER. 

 For generic characters see p. 57. 



SPECIES. 



1. C. limosa.^ Thorax equal, convex, with about 

 three serrate teeth each side; clypeus with a fissure; fin- 

 gers white. 



Cabinet of the Academy. 



Inhabits shores of the northeKn states. 

 Thorax transversely somewhat semicylindrical, gra- 

 nulated each side, three lateral serrate teeth granulated 



