DECAPODA. CRUSTACEA. LITHODES. 327 



behind the head each side. The surface is warty and beset with 

 short, stiff, hooked hairs which entangle sand and portions of sea- 

 weed. 



GENUS LITHODES, LATH. 



L. A'RCTICA. Carapax heart-shaped, spiny, rostrum bifurcat- 

 ed ; hands small, unequal ; limbs hairy. 



Cancer raaja, LIN. ; Syst. Nat,, i. 1046. HERBST j Cancr., i. 219, tab. 15, f. 87. 



Cancer horridus, PENNANT ; Brit. ZooL, iv. 7, pi. 7, f. 14. 



Tnachus maja, FABR. ; Suppl. Entom. Syst., 358. 



Parthenope maia, FABR. ; ibid., 354. 



Lithodes raaja, LEACH ; Zool. Misc., i. 107. Malacol. Podoph. Brit., tab. 24. 



Lithodes arctica, LATR. ; Genera, i. 40. DESM. ; Consid., 160, pi. 25. GUERIN ; 



Iconog. du Rbgne Jlnim., pi. 12, f. 1. MILNE-EDW. ; Hist. Nat. des Crust., ii. 



186. LAM. ; Jin. sans Vert., v. 433. Griffith's Cuvier, Crustacea, pi. 1, f. 1. 



A specimen of this fine crab was obtained from the stomach of 

 a cod-fish by Dr. Prescott, of Lynn, during the autumn of 1839. 

 It is believed to be the only specimen which has come into the 

 hands of naturalists in North America. It is found rarely about 

 the shores of Great Britain, and more abundantly about the shores 

 of Norway, which seems to be its proper habitat. There it is 

 well known, and many superstitious notions have been connected 

 with its history. 



This thorny and rugged, but beautiful crab is easily distinguished 

 from our common Spider-crab by its more heart-shaped body, its 

 long beak, branching at tip, and by the hinder pair of legs being 

 imperfect. The tail also is very large and very peculiar. The 

 carapax is about four inches long, and the spread of the legs a 

 foot or more. 



GENUS LIBINIA, LEACH. 



L. CANALICULA'TA. " Thorax densely hairy, with about seven 

 lateral spines, and a few usually shorter ones on the back ; rostrum 

 emarginate at tip, channelled between the eyes ; anterior feet un- 

 armed, granulated; hands elongated ; fingers white at tip." Say. 



Libinia canaliculata, SAY ; Journ. Acad. Nat. Sc., i. 77/pl. 4, f. 1. MILNE-EDW. j 

 Hist. Nat. des Crust., i. 300. Mas du Rbgne An., pi. 33, f. 1. LAM. j An. sans 

 Vert., v. 423. 



