/ 



37 



body, or equalling about the first 5 segments of mesosome combined, slightly 

 widening behind, terminal segment large, oblong oval and very smooth, tip obtusely 

 rounded. Superior antenna? almost attaining the length of the cephalosome, 

 basal joint about the length of the other 3 combined, terminal joint comparatively 

 short and obtusely blunted at the tip. Chelipeds rather strong, hand oblong 

 oval and longer than the carpus, fingers shorter than the palm, the immovable one 

 minutely serrulate inside. The 3 posterior pairs of pereiopoda considerably more 

 strongly built than the 3 anterior ones, and having the outer joints armed -with 

 ciliated spines, basal joint remarkably constricted at the base. Uropoda very short, 

 inner ramus conical, Particulate, and tipped by long diverging seta3, outer ramus 

 extremely minute, tuberculiform, though well defined from the basal part. Length 

 2.85 mm. 



Remarks. — From 8. aretophylax of Norman & Stebbing, the Norwegian 

 species may be at once distinguished by its much more elongated body and the com- 

 paratively larger size of the metasome. A few specimens, however, are of con- 

 siderably shorter form, but as in all of .these there are distinct traces of plco- 

 poda, they are, I believe, of the male sex, though probably not yet sexually mature. 



Occurrence. — I have found this peculiar Tanaid in several places, both 

 on the south and west coasts of Norway, in depths ranging from 50 to 200 fa- 

 thoms. It extends northwards to Selsovig, situated just within the polar circle. 



Gen. 9. Anarthrura, G. o. Sars, isso. 



Generic Characters. — Body elongated, subdepressed, with rather thin, 

 semipellucid integuments. Cephalosome comparatively short and obtusely trun- 

 cated in front. Metasome in female very poorly developed, narrower than the 

 mesosome, and without a trace of segmentation; that in male, however, of quite 

 normal appearance, being divided into 6 well-defined segments. Eyes wanting. 

 Superior antennae in female 4-articulate, in male but slightly different, though 

 composed of 5 articulations. Mandibles extremely small and rudimentary, cutting 

 edge simple, molar expansion wanting. Chelipeds comparatively small, with the 

 basal part of a somewhat unusual structure, being oval, tumid, and divided into 

 2 distinct segments, hand rather small, with the palm unusually short. The 3 

 anterior pairs of pereiopoda rather slender and nearly equal, the 3 posterior 

 pairs rather different, and considerably more strongly built. Pleopoda in female 



