149 



tending as far as the 3rd peduncular joint of the inferior antennae. Anterior 

 segments of mesosome short, and transversely excavated, with the lateral parts acutely 

 produced in front. Fifth and 6th segments confluent dorsally, and forming a 

 large vaulted plate deeply emarginated behind. Caudal segment semioval, edges 

 evenly curved and perfectly smooth. Inferior antennae not very elongated, scarcely 

 exceeding by more than 1 / i of their length that of the body, the 2 outer joints 

 of the peduncle edged with slender spines, flagellum much shorter than the peduncle. 

 Epignath of maxillepeds oblong lanceolate, coarsely striolate. 1st pair of legs 

 but little different from the 3 succeeding ones, which are rather short, scarcely 

 exceeding half the length of the body. Natatory legs with the propodal joint 

 rather broad, oval, constricted at the base, dactylus narrow lanceolate, and about 

 half the length of the former joint; last pair considerably smaller than the 2 pre- 

 ceding ones, and having the carpal joint lamellarly expanded outside. Uropoda 

 with the outer ramus much shorter and narrower than the inner. Colour whitish, 

 semipellucid. Length of adult female scarcely attaining 2 mm. 



Remarks. — In the coalesced 5th and 6th segments of the mesosome, this 

 species agrees with the 2 preceding ones, but otherwise it is rather different, and 

 easily recognisable by the conically produced, and minutely bifurcate frontal part, 

 the unusually short inferior antennas and ambulatory legs, and the whitish colour. 



Occurrence. — I first detected this form off the Lofoten islands, at Skraa- 

 ven, where it is not uncommon in 100 — 120 fathoms, on a bottom consisting of 

 sandy clay. Subsequently I have also met with it in a widely distant locality, 

 viz., in the inner part of the Stavanger Fjord, at Jelso. Out of Norway this form 

 has not yet been recorded. 



6. Euryeope mutica, G. 0. Sars. 



(PI. LXVIII, fig. 1.) 

 Euryeope mutica. G. 0. Sars, Om en anomal Gruppe af Isopoder. Chr. Vitl. Selsk. Fork. 18H3, p. 6. 



Specific Characters. — Body broadly oval, greatest width exceeding half the 

 length and occurring in the middle. Frontal part of cephalon rather broad and 

 obtusely rounded at the tip. Anterior segments of mesosome with the lateral 

 parts not acutely produced in front; 5th and 6th segments imperfectly defined 

 dorsally. Caudal segment not very large, slightly coarctated towards the tip, 

 which is narrowly rounded, lateral edges setiferous. Superior antennae compara- 

 tively small, flagellum composed of only 5 or 6 articulations. Inferior antennae 

 very slender, fully twice as long as the body, flagellum more than ^wice the 

 length of the peduncle. Epignath of maxillipeds short and broad, obtusely trun- 

 cated at the tip. 1st pair of legs with the propodal joint much shorter than 



