34 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. PARAPHRONIMID^E. 



The first pair of antenna? (PL II, fig. 23 and 24) of the male are shorter and more 

 obtuse than in the other species; they are scarcely half as long as the head, in the male, 

 and about a third of the length of head, in the female. The first joint of the peduncle 

 is four times longer than the two following joints, in the male, in the female it is three 

 times longer; the second joint is a little longer than the third. The first joint of the 

 flagellum is scarcely twice as long as the whole peduncle. In the female the third and 

 second flagellar joints are distinct; they are very minute, the last provided Avith three or 

 four short hairs; in the male the terminal joints are obsolete. The olfactory bristles 

 are stout, long, cylindrical, with a narrow neck, fixed at a small, round desk. 



The second pair of antenna? (PI. II, fig. 25, 26 and 27) are similar to those in 

 Paraphronima gracilis. 



The mouth-organs form an obtuse cone at the lower hinder corner of the head, just 

 behind the bases of the second pair of antennas. 



The labrum (PI. II, fig. 28) is very broad, emarginate at the lower hinder margin, 

 and covered with minute hairs. 



The mandibles (PL II, fig. 29 and 30) are large and strong, without palp and molar 

 tubercle, terminating with an incisive process crenulated with seven rounded teeth; at the 

 base of the process there are some short hairs. At the inside of the process is an outlet 

 for a strongly developed gland, which occupies the interior of the stem of the mandible. 

 The left mandible has an accessory process, thin, feebly hollowed, provided with a finely 

 denticulated edge. 



The first pair of maxilla? (PL II, fig. 31) consist of two lamina?, the inner, or prin- 

 cipal lamina, is broad at the base, terminating into a tongue-shaped process armed at apex 

 with two very stout spines and about a dozen bristles; the outer, or secondrary lamina, ar- 

 ticulates with the outer side of the principal lamina, it is feebly curved, with a bristle at 

 apex, and a minute one on the outer margin. 



The second pair of maxilla? (PL II, fig. 32) consist of two laminae, both broadly 

 rounded at apex, and fringed with short bristles, the secondary lamina is a little narrower 

 than the principal one. 



The ma.rillipeds (PL II, fig. 33 and 34). The basal portion is narrow, the usually 

 free two lobes or palps are here coalesced into a broad, scoop-like covercle which conceals 

 almost the whole of the mouth-organs. 



The perceon. The first segment is a little longer than the second, the seventh the 

 longest, but much shorter than the first pleonal segment. 



The first pair of perceopoda (PL II, fig. 16 and 32) have a dilated, elongate-ovate 

 femur only three times longer than broad, and scarcely longer than all the following joints 

 together. The carpus is comparatively longer and narrower than in the two preceding 

 species; the under margin is not straight, more or less convex; at the lower hinder corner 

 it carries one or two stout, short spines; the posterior margin is almost straight. The 

 metacarpus is considerably shorter than the carpus, with two short spines at the apex. 

 The dactylus is pedunculated, robust, of the same shape as in Paraphromina gracilis, 

 equalling a fourth of the length of the metacarpus. 



