162 CRUSTACEA. DECAPODA. 



esteemed as food before and during the period of depositing the ova. It is very com- 

 mon in the Mediterranean. 



P. ornatus, Fab. Shell spinous, greenish,, and the front with six 

 horns ; feet ringed with blue and white. Inhabits Isle of France. 

 Desm. Crust. 185. 



FAMILY IV. SCYLLARIDES. 



Lateral antennae, or rather their peduncle, in the form of a flat- 

 tened and horizontal crest. 



Gen. 47. SCYLLARUS, Fab. Lat. Cancer, Lin. 

 Lateral antennae with four flattened joints, the intermediate fi- 

 liform, with the last joint bifid ; eyes distant ; body oblong ; 

 shell large, broad, slightly convex ; tail extended, semicylin- 

 drical, terminated by a lamellar fan-shaped fin ; ten ungui- 

 culated almost similar feet, without forceps. 



S. arctus, Fab. An elevated carina in the middle of the shell, with 

 a triple series of dentations ; external antennae much dentated. 

 Inhabits European seas Herbst, pi. 30, fig. 3. 

 These animals are popularly known by the name of Sea-Grasshoppers. They bur- 

 row in the sandy shores. In swimming they make a noise like the Palinuri. 



Gen. 48. TRENDS, Leach. 



Hinder legs with simple tarsi; thorax subdepressed, broader 

 anteriorly ; eyes inserted at the anterior angles of the thorax. 



T. IndicuSj Leach. External antennae serrated ; thorax granulat- 

 ed, carinated, trispinous ; abdomen granulated, the granules ar- 

 ranged transversely. Indian ocean Sup. Ency. Brit. i. 419. 



FAMILY V. GALATHIN.E. 



All the feet, with the exception of the two anterior, which are 

 didactyle, similar in form and proportions. 



Gen. 49. ERYON, Desm. 



Exterior antennae short, setaceous, with a large scale at the base, 

 ovoid and notched on the internal side ; intermediate ones bi- 

 fid and shorter ; first pair of feet nearly as long as the body, 

 slender, linear, with long and narrow forceps; feet of the 

 other pairs slender, the second and third with forceps ; shell 

 much depressed, broad, almost square, deeply notched on its 

 anterior sides ; caudal fin of five pieces, the two lateral ones 

 entire. (Fossil.) 



E. Cuvieri. Found at Pappenheim and Aichstedt Desm. Crust. 20*7 . 

 Geri. 50. MEGALOPA, Leach. Cancer, Mont. 



Exterior antennae setaceous, formed of long joints, the interme- 

 diate terminated by two bristles, of which the upper is long- 

 est ; exterior feet-jaws with the first two joints compressed, 

 tlie second notched ; anterior feet equal, with didactyle claws ; 



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