366 OAKL B0VALL1U8, AMFIIirOUA HYPEKIIDEA. I. 2. PHRONIMID^. 



Vhronima sedentaria. 



T h e f e m a 1 e. 



Pl. XVI, fig. 1-3. 



The body is slender; the head and peraion together are loriger than the pleon and 

 ur US together. The integumcnt is pellucid, bot tolerably thiclc. 



The head is bluntly conieal, with the u])per part the widest and roiinded; it is 

 uaore than twice as deep as long. The front side is flat, but Avithoiit antennal groove. 



The eyes have been miuutely described by Claus, to whose treatise 1 rcfer the 

 reader. 



The Jirst pair of antennw are tixed behjw the middle of the front side of the head, 

 and consist of a single-jointed peduncle, which is soinewhat longer than broad, and a 

 single fiagellar joint. The fiagellum is slender, cylindrical, with the apex rounded and 

 set with long olfactory hairs; it is about four tinies as long as the peduncle, and is coni- 

 paratively largcr in the young female than in the adult. 



The second pair of antennen are reduced to a tubercular proniinence near the lower 

 end of the front side of the head. 



The mouth-organs are exactly like those in Phronima Coletti, and will be described 

 under that species. 



The -perceon. The forepart is broad and scarcely compressed, gently narrowing to 

 the hind margin of the sixth segment. The seventh is very long and compressed, equall- 

 ing in length the three pi^eceding segments together. 



The epimerals are entirely fused with the peraäonal segments without the slightest 

 trace of a suture in the adult animal, in the young on the other hand tlie epimerals are 

 indicated as small tubercles above the base of the femora. 



The branchial vesicles are strongly developed at the fourth, fifth and sixth pairs of 

 perajopoda, and attain nearly the length of the corresponding femora. The are attached 

 to the peraäonal segments a little behind the insertion of the femora, and are elongate- 

 ovate in form. The vesicles of the second and third pairs are small and thin but distinct 

 in the adult as well as in the young animals. 



The ovitectrices are very thin, laminar, irregularly triangulär, and are, M'hen the 

 eggs are deposed in the dwelling of the female, closely pressed again st the underside of 

 the perteon. The are attached to the second, third, fourth and fifth pairs of perasopoda, 

 inserted close to the bases of the femora. 



The first pair of perceopoda (Pl. XVI, fig. 1) reach only a little beyond the lower 

 end of the head. The femur is narrow, feebly curved, and a little longer than the three 

 foUowing joints together. The genu is as long as broad. The tibia is broadly produced 

 at the lower hind corner, and has the under margin truncated and sharply serrated. The 

 carpus is tolerably dilated; the carpal process is gouge-shaped with the front margins 

 convex and sharply serrated; it is quite halfas long as the metacarpus. The metacarpus 

 is feebly curved, almost cylindrical, and only a little tapering towards the apex, where it 



