164 

 Family Eryoniflce, Dana. 



Dana. U. S. Expl. Exp. Crust., pt. I. p. 515 : Spence Bute, Challenger Crnst. Macrara, p. 100: Stebbing, Higt. 

 Crnst., p. 199: Ortmann in Bronn's Thier Reicli, Malacostrnca, p. 1136. 



See also Norman, Ann. Mag. Nat. Hist. (6) II. J878, p. 382, and (5) IV. 1879, p. 173. . 



Carapace either depressed with very sharply defined lateral borders, or (less 

 commonly) truly globose ; without rostrum : anteriorly it is soldered to the 

 epistome on either side, posteriorly its angles are nipped and firmly bolted between 

 two peg-like processes of the 1st abdominal somite, the underlying peg standing 

 on the anterior border of the somite, the overlapping peg falling from the angle 

 of the rudimentary pleuron. The abdomen is of good breadth and the telson 

 is acute : the terga overlap one another and the pleura behind the 1st are well 

 developed. 



The eyes are rudimentary and the eyestalks are immovably fixed, in all the 

 recent forms. 



The antero-internal angle of the basal joint of the antennular peduncle is 

 produced to form a stiff scale. Of the two antennular flagella the inner 

 resembles that of the antenna? while the outer is very short. 



The antennal scale is narrow and does not overlap the antennal peduncle, 

 which is five-jointed : the renal tubercle of the basal joint of the peduncle is 

 remarkably prominent : the antennal flagellum is lash-like. 



The mandible consists of a convex serrated incisor plate and a three-jointed 

 palp. 



The 1st and 2nd maxilla? and the 1st maxillipeds are somewhat remote from 

 the middle line, and appear to take little part in manducation. The 1st maxillae 

 consist of slender curved coxopodite and basipodite, without palp. The .2nd 

 maxilla? consist of a small coxopodite and basipodite, neither of which is. sub- 

 divided, a slender endopodite, and a very large scaphognathite. The 1st 

 maxillipeds have a rudimentary coxopodite, an insignificant basipodite, and a 

 slender endopodite ; but their exopodite is a huge somewhat convoluted leaf, to 

 the distal end of the inner border of which a reflexed lobe is articulated, the 

 whole organ forming a sort of valve-like tongue to the efferent branchial canal, 

 beyond which it projects; its epipodite also, which is a prolongation of the 

 exopodite, is very large. 



The 2nd maxillipeds have neither exopodite nor epipodite : they are pediform 

 and six-jointed the basis and ischium being fused and their dactylus is spini- 

 form. 



The external maxillipeps have no exopodite, but they may have an 

 epipodite: they are pediform and 7-jointed, though there is no independent 

 motion between the basis and ischium. 



The thoracic legs are all seven-jointed: the first four pairs are always 

 chelate and the fifth pair also are often so : the first pair is very much longer 



