19 



basal one. Inferior antenna? with the 2nd joint of the peduncle considerably 

 dilated. Chelipeds much attenuated, hand very narrow, and not nearly attaining 

 the length of the carpus, fingers shorter than the palm. 1st pair of pereiopoda 

 longer than the others; the 2 succeeding pairs comparatively robust, with the 

 nii'ial joint dilated distally, triangular in form, and carrying inside a strong spine; 

 the 3 posterior pairs likewise strongly built, with the basal joint much tumefied, 

 and the 2 outer joints minutely serrulate on the inner edge. Uropoda attaining 

 half the length of the metasome, both rami Inarticulate and rather narrow, 

 especially the. outer one, which scarcely exceeds in length the basal joint of the 

 inner, and has its terminal joint about twice the length of the basal one. Length 

 reaching to 4.20 mm. 



Remarks. — This is the largest and finest species of the genus, and may, 

 moreover, easily be recognized by the strongly attenuated chelipeds and the 

 structure of the uropoda. It may be regarded as the type of the genus. 



Occurrence. — I have met with this beautiful form in numerous places 

 on the Norwegian coast, from the Christiania Fjord up to the Lofoten Isles, in depths 

 ranging from 50 to 300 fathoms. In some places, for instance in the Christiania 

 Fjord south of Drobak, it occurs in considerable numbers on a bottom of loose 

 muddy clay, covered with decaying Zostera. The specimens examined by Prof. 

 Lilljeborg were procured at Molde. Out of Noi'way, it has not yet been recorded. 



2. Typhlotanais mieroeheles, ti. 0. Sars. 



(PI. VIII, fig. 2.) 

 lyplilotanais mieroeheles, G-. O. Sars, I. c. p. 38. 



Specific Characters. — 9- Body somewhat more slender than in the pre- 

 ceding species, being about 7 times as long as it is broad, and having the seg- 

 ments more sharply marked oft' from each other. Cephalosome gradually attenu- 

 ated anteriorly, frontal margin acutely produced in the middle. First free segment 

 of mesosome rather short and somewhat widening in front; the remaining seg- 

 ments subquadrate in outline. Metasome scarcely broader than the mesosome, and 

 having the terminal segment rather short. Superior antennas comparatively short, 

 but little exceeding half the length of the cephalosome, conical in form, basal 

 joint longer than the other 2 combined, terminal joint produced at the tip to a 

 somewhat inward-pointing denticle. Inferior antennas with the 2nd joint of the 

 peduncle less dilated than in the preceding species. Chelipeds rather poorly 

 developed, hand unusually ' small and narrow, with the fingers about the length of 

 the palm. 1st pair of pereiopoda not very different from the 2 succeeding 

 pairs, though with the dactylus more produced. The 3 posterior pairs less 



