646 



EemarJcs. The Rev. Mr. Stebbing has called attention to the fact, 

 that the type of this genus has already been described by Slabber in the 

 year 1749 as PMsica marina, and, according to the laws of priority, the 

 generally used generic name Proto, which was proposed by Leach in 1814, 

 must therefore cede to the much older generic name Phtisica of Slabber. Two 

 other generic names have been proposed by Latreille, viz., Leptom&ra and 

 Naupredia, both being merely synonyms. From all the other CapreHufa, this 

 genus is easily distinguished by having all the pereiopoda distinctly deve- 

 loped. Several species of this genus have been described, but some of them 

 are very unsatisfactorily characterized, and P. Mayer only admits 4 species. 

 ' the fauna of Norway belongs but a single species, to be described below. 



1. Phtisica marina, Slabber. 



(PI. 223). 

 Phtisica marina, Slabber, Natuurk. Verlust, p. 79. 



Syn.: Sqnilla ventricosa, Miiller 9. 

 Gammarus pedatus, Abildg. 

 Proto pedata. Leach. 

 Leptomera pedata, Latr. 

 Leptoniera ventricosa, Desrn. 

 > Naupredia tristis, v. Bened. 

 Proto Goodsiri, Sp. Bate, 

 ventricosa, Boeck. 



Body extremely slender and perfectly smooth, with the 4 anterior 

 free body-segments somewhat fusiform in shape; antepenultimate segment 

 fully as long as the preceding one; last segment very short. Cephalosome 

 (cephalon -|- 1st segment of mesosome) much shorter than the succeeding seg- 

 ment and nearly club-shaped, being obtusely rounded in front. Eyes of 

 moderate size, orbicular, with dark red pigment and well-developed visual 

 elements. Superior antennae exceeding half the length of the body, 2nd joint 

 of the peduncle the longest, 3rd joint longer than the 1st, flagellum not quite 

 as long as the peduncle, and composed of about 14 articulations. Inferior 

 antennae scarcely half the length of the superioi, and much narrower, with 

 only scattered bristles posteriorly, the last 2 joints- of the peduncle nearly 

 equal-sized, flagellum about the length of the last peduncular joint, and com- 

 posed of 5 articulations. Anterior gnathopoda with the carpus comparatively 

 narrow and but slightly widening distally, propodos about twice its length 

 :ind rather expanded, subtriangular in form, palm very oblique, and defined 



