248 



ova in the marsupial poach reddish. Length of adult female 5 mm, of 

 male 6 mm. 



Bemnrli:. — Though nearly allied to P. gregan'ioii, and evidently 

 congeneric, the present species may readily be distinguished by the some- 

 wliat different form of the 2nd and 4th pairs of coxal plates, the very large 

 eyes, the structure of the posterior gnathopoda in the 2 sexes, and by the 

 very much produced meral joint of the 3 posterior pairs of pereiopoda, which 

 latter characteiistic has, indeed, given rise to the specific name. In the 

 living state the species is moreover at once recognized by its uniformly 

 whitish body, and by the light red ocular pigment. 



Occurrence. -- I have met with this form in a few places oif the 

 west coast of Norway, Lyngholmen, Bekkervig and Christiansund, • as also 

 in the Trondhjemsfjord, and northwards to Tjoto off the Nordland coast. 

 It is a true deep-water form, occurring only in depths varying from 80 to 

 150 fathoms, and especially in the region of the deep-sea corals. Out of 

 Norway, it has not yet been recorded. 



Gen. 3. Metopa, Boeck, 1870. 



Syn: Leueothe, Kroyer (not Leach). 

 > Moutasiia, Sp. Bate (part). 



Body more or less compact of form, with rather deep coxal plates, 

 the 4th pair of which are very large and broad. Antennae more or less 

 slender, their mutual length different in the different species. Anterior and 

 posterior lips about as in the preceding genus. Mandibles likewise of a 

 much similar structure, and provided with distinct though rather small 

 palps. First pair of maxillae with the palp only consisting of a single joint. 

 Maxillipeds with the basal lobes coalesced nearly to the tip. Gnathopoda 

 very unequal; the anterior ones rather small, and, as a rule, imperfectly 

 subcheliform, the posterior ones more or less powerful, distinctly subcheliform, 

 and generally larger and somewhat differently shaped in the adult male, 

 meral joint not acutely produced below. Anterior pairs of pereiopoda about 

 as in Probolinm, the 3 posterior pairs, as a rule, somewhat more elongated. 

 Uropoda and telson about as in the 2 preceding genera. 



Reniarl's. — This genus, established by Boeck, was distinguished by 

 that author from the genus Stenothoc chiefly by the mandibles having distinct 



