678 CLASS x. 



Gelasimus LATR. Peduncles of eyes slender, cylindrical, with 

 eyes terminal. Shell broader than long, trapeziform. 



Sp. Gelasimus vocans, Cancer vocans L., DE GEEK Mem. p. s. a I'Hist. des 

 Ins. vn. PI. 26, fig. 12, from the coast of Brazil. Comp. LINN. Amcen. 

 Acad. vi. p. 414 ; Gelasim. Marionis DESM. Crust. PI. 13, fig. i, &c. 



Ocypode LATR. Peduncles of eyes acuminate, with a horn pro- 

 duced beyond the eyes. Shell subquadrate. 



Sp. Ocypode ceratophthalma FABR., Cancer cursor L., PALLAS Spicil. Zool. 

 ix. p. 83, Tab. v. figs. 7, 8, DESMAR. Crust. PI. 12, fig. i ; from the Red 

 Sea and the Indian Ocean. 



Add genera Uca LEACH, Cardisoma LATR., MacrophtkalmuslLA.'Tn., 

 Cleistostoma DE HAAN, Hymenosoma LEACH, Myctiris LATR., Doto 

 DE HAAN, &c. Comp. DE HAAN Faun. Japon., Crust, p. 5, 

 pp. 24 30. Here also belongs genus Halicarcinus WHITE. 



B. Fourth joint of maxilliform feet placed on the inner angle of 

 third joint. 



Shell mostly arcuate anteriorly , ivith margin convex, truncated 

 posteriorly. 



Telphusa LATR. Shell depressed, smooth, cordate, broad. Ex- 

 ternal antennae very short, inserted near the peduncles of eyes. 



Sp. Telphusa fluviatilis LATR., Crdbe de riviere OLIVIER, Voyage dans 

 V Empire Othoman, PI. 30, fig. 2, DESMAR. Crust. PI. 15, fig. 2 ; in fresh 

 water in the south of Italy, Greece, Egypt, &c. 



Here belong also the genera JBoscia EDW. and Trichodactylus LATR. 



Eriphia LATR. Shell cordate or trapeziform. External antennas 

 exsert, remote at their insertion from the petioles of eyes. 



Sp. Eriphia spinifrons LATR., Cancer spinifrons HERBST, FABR., DESMAR. 

 Crust. PI. 14, fig. i. 



Add genera Ruppellia EDW., (Eudora DE HAAN), Trapezia LATR. 



Cancer FABR. (species from Cancer L., div. Irachyur.). Shell 

 broad, anteriorly arcuate, gibbous. Chelae thick. Eight remaining 

 feet with last joint styliform, not natatory. Third joint of maxilli- 

 form feet of third pair quadrate. 



Sp. Cancer pagurus, Platycarcinus payurus LATR., EDW., DESMAR. Crust. 

 PI. 8, fig. i ; BELL Brit. Crust, p. 59 ; the common sea-crab ; 6 inches 

 broad or broader, the shell reddish brown, granularly uneven and on each 

 side with nine incisures or grooves ; the shears smooth and, as in other 

 species of this division, black at the point ; this species is edible and 

 very tasty. 



