866 THE VOYAGE OF H.M.S. CHALLENGER. 



processes on the anterior perseon-segments, by the different shape of the gnathopods, and 

 other particulars. 



Heller places the genus between Amathilla and Gammaracanthus, apparently there- 

 fore, as already observed, including it in the subfamily Gammarinse as defined by Boeck, 

 but with Boeck's definition it does not well agree either in regard to the first maxillee, the 

 spines of which are neither furcate nor serrate, while both the palps are similarly not 

 difi"erently armed, or in regard to the maxillipeds, in which the inner plates are small, not 

 elongate, or in regard to the pergeopods, of which the three last pairs, according to 

 Heller, successively decrease in length, instead of increasing in accordance with the defini- 

 tion. The objections are of less importance which may be urged against affiliating this 

 genus to Boeck's subfamily Epimerinse. 



Genus Zaramilla, n. gen. 



Antennas short. 



The Upper Lip) distally rounded. 



Mandibles with strongly dentate cutting plates ; a secondary plate on each 

 mandible ; several denticulate spines in the spine-row ; the molar tubercle prominent ; 

 the palp three-jointed, the second and third joints large. 



Tlie Lower Lip broad. 



First Maxillse. — The inner plate with many plumose setae. 



Second Maxilla;. — The inner plate with many plumose sette on or near the inner 

 margin ; the outer plate rather longer and broader than the inner. 



Maxillipeds. — The outer plates with spine-teeth on the inner margin ; the second 

 joint of the palp long, the fourth slender and acute. 



The First and Second Gnathopods similar, subchelate, the wrist subequal in length 

 to the hand. 



The third joint large in all the Perseopods, in the last three pairs remarkably 

 developed; the fingers of the perseopods having a little cap over the point of the nail. 



The Uropods biramous, the rami equal in the first and third pairs, the outer branch 

 the smaller in the second pair. 



The Telson not very elongate, deeply cleft. 



The generic name is taken from an imaginary personage in Don Quixote. 



The genus, in regard to the head, antenna, gnathopods, and pleon, would reasonably 

 be arranged among the Atylidse, while the perseopods, except the last pair, and in some 

 respects the mouth-organs, would bring it near to the CEdiceridse. From the Ponto- 

 poreiidffi it is separated by the absence of the secondary flagellum from the upper 

 antennae. 



