BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 27. AFD. IV. N:0 8. 39 



Fam. Alpheidae. 



Bythocaris G. O. Särs. 



13. Bythocaris simplicirostris G. O. Sars. 

 Fig. 1. 



1870. Bythocaris simplicirostris G. O. Sars, Nye Dybvaudscrust. fra 



Lofoten, 1. c. p. 149. 

 1886. v » G. O. Sars, Norw. North Atl. Exp., 



II, p. 7. 

 1897. » » BlRULA,Essaid'une faunedescrustacés 



décapodes etc, 1. c. p. 427, tab. XX, 



fig. 3. 



Locality: 

 in 1900: 

 stat. 21. East Greenland, off Kaiser Franz Joseph Fiord, between 



Kontekoe Island and Mackenzie Bay, depth 250 m., mud, 



8, VIII, one spec. 



Of this species, upou which G. O. Sars based his genus 

 Bythocaris, mainly distinguislied from Hi])polyte by the struc- 

 ture of the mandibles, I found a single female amongst a 

 number of Bythocaris Fayeri. In all essential details it 

 closely agrees with Sars' description. Thus the dorsal carina 

 is provided with two small spines, the hindmost of which is, 

 however, very minnte and almost blnnt. The third segment 

 of pleon has a median dorsal hook. Telson, as in Bythocaris 

 leucojns, with fonr minute spinules on either side. The basal 

 joint of the peduncle of antennse has a spine on the inner 

 margin. The scales of the antenna rather remind us of that 

 in Bythocaris Payeri than of that in Bythocaris leucopis. 

 Mandibles, maxilla, and maxillipeds, as in last species. Last 

 joint of third pair of maxillipeds with 8—9 spinules. Fifth 

 joint of second pair of pereiopods divided into 10 articu- 

 lations. 



The specimen was an egg-carrying female; the eggs, as 

 is usual in the genus, being of large size and few in 

 number. 



This species, which is easily recognizable from its nearest 

 allied species, by the form of the rostrum was observed for 



