657 



male specimens, and cannot therefore, as yet, be regarded as satisfactorily 

 defined. On a closer examination of the material at my disposal, I have, 

 up to the present felt justified in adopting 9 Norwegian species, one of which 

 is now for the first time established. 



6. Caprella linearis, (Lin.). 



(PI. 2.36). 

 Cancer linearis, Linn6, Syst. Nat. p. 1066. 



Syn. : Squilla lobata, O. Fr. Miiller. 



> — quadrilobata, O. Fr. Miiller. 



» Gammarus quadrilobatus, 0. Fr. Miiller. 



- Caprella lobata, Gueriii, 



» — Isevis, Goodslr. 



» — pliasuia, Katlike. 



» — acuminifera, Rathke. 



> — scolopendroides, Rathke. 

 » — laticornis, Boeck. 



Body in female rather narrow, though having the 3rd and 4th seg- 

 ments of mesosome, which carry the marsupial pouch, very broad and expanded. 

 Anterior part of the body generally smooth, or with very slight traces of 

 dorsal tubercles, the 3 posterior segments more distinctly tubercular. Body 

 in the adult male much more slender, its anterior part, comprising the cepha- 

 losome and the 1st free body segment, being greatly elongated, and about equal- 

 ling in length the 3 succeeding segments combined. Eyes small, orbicular, 

 with red pigment. Supez'ior antennae in female about half the length of the 

 body, 2nd joint of the peduncle the longest, 3rd joint about the length of 

 the 1st, flagellura nearly as long as the peduncle, and composed of about 13 

 articulations; those in male having the joints of the peduncle more or less 

 expanded and finely ciliated on the edges, flagellum scarcely attaining half 

 its length. Inferior antennae in female much longer than the peduncle of 

 the superior ones, in male but little exceeding half its length, flagellum about 

 the length of the last peduncular joint. Anterior gnathopoda with the carpus 

 comparatively short and forming below a rounded, setiferous lobe, propodos 

 twice as long as the carpus, and oval triangular in form, palm occupying 

 nearly the whole inferior edge, and defined behind by a distinctly projecting 

 angle armed with a spine. Posterior gnathopoda in female moderately strong 

 and attached in front of the middle of the corresponding segment, propodos 

 oval in form, palm terminating in front with a very slight rounded lobe 



