36 CAFRELLID.E. 



A MPHIPODA . CA PRELUDE. 



ABEREANTIA. 



Genus PROTO. 



Proto. LEACH, Linn. Trans, xi. p. 362, 1814. DESMAREST, Consid. 



sur Crust, p. 276, 1825. SPENCE BATE, Cat. Amph. Brit. 



Mas. p. 349. 

 Leptomera. LATREILLE, in CUVIER, Regne Animal, 1st ed. iii. p. 51, 1817. 



DESMAREST, Consid. sur Crust, p. 275. GTUERIN, Icono- 



graph, R. An. Crust, pi. xxviii. fig. 3. KROYER, Nat. 



Tidsk. iv. p. 496. MILNE EDWARDS, Hist, des Crust, iii. 



p. 109. GOSSE, Mar. Zool. i. p. 131. 

 Naupredia. LATREILLE, in CUVIER, Regne Animal, 2nd ed. iv. p. 128. 



Cours d'Entomol. p. 393. VAN BENEDEN, Faune litt. de 



Belgique. 



Generic character. Cephalon confluent with the first seg- 

 ment of the pereion. Pereion having the last joint shorter 

 than the preceding, cylindrical. Pleon rudimentary. Gnatho- 

 poda subchelate. Three anterior pairs of pereiopoda short and 

 feeble, last two long and powerful. 



IN this genus the head is small and globular, and so 

 closely attached to the first segment of the body that it 

 can only be distinguished from it by close observation. 

 The body is cylindrical, and the tail is rudimentary. The 

 eyes, antennae, and organs forming the mouth are similar 

 to those in the group NORMALIA, but the legs have the 

 first joint closely fused with the respective segments to 

 which they are attached. In this respect we perceive a 

 resemblance to the development of the same parts in the 

 highest organized decapods. Many genera of the Bra- 

 chyura have the coxae as closely anchylosed with the 

 pereion as we here see exhibited in animals at the oppo- 

 site extremity in the scale of development. The first 

 two pairs of legs are subchelate, the second being the 

 larger. The next four pairs are equidistant from each 



