352 BULLETIN 1)7, UNITED STATES NATIONAL MUSEUM. 



A'. Merus of maxilliped with nn inner distal emargination. 



B 1 . Emargination of nierus of maxilliped very shallow, rounded, not at nil 



V-shaped lateralis, p. 355. 



B*. Emargination of merus of maxilliped V-shaped, sometimes continued 



backward by a closed fissure. 

 C*. Antero-external angle of merus of raaxilliped strongly produced beyond 



(he emarginatiou and fissure on the inner margin lagostoma. p. 3d. 



C*. Antero-external angle of merus of maxilliped not produced much beyond 

 antero-internal angle.- planning, p. 359. 



ANALOGOUS SPECIES ON OPPOSITE SIDES OF THE CONTINENT. 



Atlantic. Pacific. 



ruricola 



. f quadratus (also on the Atlantic side of the Isthmus). 



SPECIES EBEONEODSLY BEFEUKED TO THE GENUS GECABC1XPS, 



Gccarcinus barbiger Poeppig IS&QParaxanthus barbiger (Poeppig). 

 Cccarcinus rcglus Poeppig lS3G=ffomafa*pt* plana (Milne Edwards, 1834 >. 



GECARCINUS RURICOLA (Linnaeus). 

 BLACK OR MOUNTAIN CRAB; BLUE LAND-CRAB; RED TOURLOUROO. 



Plates 117 and 118. 



Cancer terrestris cuniculos sub terra ayens SIXJANE, Voy. Jamaica, vol. 1. 

 1707, pi. 2 ; vol. 2, 1725, p. 269 ; Jamaica. 



Cancer sulcatus, terrestris, sivc montanus, Americanus SEBA, Thesaurus, 

 vol. 3, 1758, p. 51, pi. 20, fig. 5; Curassoa. 



Cancer ruricola LINNAEUS, Syst. Nat., ed, 10, vol. 1, 1758, p. 626 (type- 

 locality, America ; type not extant). HEKBST, Natur. Krabben u. Krebse, 

 vol. 1, 1783, p. 119, pi. 3, fig. 36, copied; pi. 4, fig. 37, copied; 1790, 

 p. 262, pi. 20. fig. 116 ; vol. 3, 1799, p. 37, pi. 49, fig. 1. BBOWNE, Hist 

 Jamaica, index 3, 1789 (reference to p. 423). 



Cangrejos Ajaes Tcrrcstres PAKBA, Descripcion de diferentes piezas de 

 Historia Natural, Havana, 1787, p. 164, pi. 58 (color varieties). 



Ocypodc tourlourou LATBEILLE, Hist. Nat. Crust., vol. 6, 1803, p. 36 (type- 

 locality, Santo Domingo; type in Paris Mus.). 



Cccarcinus ruricola LEACH, Trans. Linn. Soc. London, vol. 11, 1815, p. 322. 



Ocypoda rubra FCEMINVIIXE, Ann. Sci. Nat., ser. 2, Zool., vol. 3, 1835, p. 222 

 (type-locality Antilles; type in Paris Mus.). 



Cccarcinus agricola REJCHENBACH, Zoologie oder Naturgeschichte des 

 Thierreichs, vol. 2, 1836 (Zittau und Leipzig), p. 230; South America 

 and Antilles. 



Diagnosis. Large. Fronto-orbital width much more than one- 

 third width of carapace. Maxillipeds cover epistome and antennu- 

 lar cavities; merits suboval, subentire. Chelipeds equal. Dactyli 

 of legs with six rows of spines. 



Description. Branchial regions greatly swollen sideways. Cer- 

 vical suture very deep, ending anteriorly in a pit near the orbital 

 angle. Equally deep is the median suture which runs nearly a third 

 the length of the carapace; cardiac region less deeply outlined. 



