the TronfJhjpm Fiord. 271 



genus luivc been described — B. Paujic/tii, Bucholz*, li. Pay- 

 eri, Heller f, B. leucopis^ G. O. Sars |, and B. nana, 8. I. 

 Smith § ; and the present species, which is the type of the 

 genus. 



Jiythocaris simpUcirostris appears to be extremely rare. 

 I dredged two specimens in 250-300 fathoms, Rcidbcrg. 

 Sars described the species from a single female dredged in 

 250 fathoms, Lofoten Islands. Two mutilated examples 

 were taken by the Norwegian North-Atlantic Expedition, 

 one between Finmark and Bear Island in 191 fathoms, the 

 other west of Spitzbergen in 416 fathoms. 



B, simph'cirostris is distinguished from the more recently 

 described species by the following characters : — 



Carapace with only a very slight central carina, suddenly 

 terminated anteriorly in a notch and armed with a spine. 

 Frontal area considerably projecting ; middle spine-process 

 (rostrum) subulate, round, smooth, acute, extending forwards 

 to beyond the middle of the basal joint of the antcnnules, and 

 longer than the long eyes ; the flanking lateral spine-processes 

 acute and well-developed, about one third the length of the 

 central. Eyes well developed, on long peduncles, when 

 laterally projected extending beyond the sides of the carapace. 

 Scale of antennae of great size, as long as the entire carapace 

 and three times as long as its own greatest breadth ; apically 

 well rounded and greatly overtopping the spine-process of the 

 outer margin. Telson slightly emarginate at the extremity. 



12. Cryptocheles pygmaa, G. O. Sars. (PI. XII. figs. 2-5.) 



1869. Cryptocheles pygmcea, G. 0. Sars, " Nye Dybvandscrustaceer fra 

 Lofoten" (Videns'k.-Selsk. Forhand.), p. 6 (separate copy). 



Rodberg, on the precipices, in 150-250 fathoms. I have 

 also dredged it in 200 fathoms near Lervig, on the Hardanger 

 Fiord. Sars's types were from the Lofoten Islands in 120- 

 300 fathoms ; he has also procured it at Ilesthammer, in the 

 Hardanger Fiord, in 100-150 fathoms, and it was dredged 

 by the Norwegian North-Atlantic Expedition at the mouth 

 of the Sogne Fiord, in 200 fathoms. It has as yet only been 

 found on the Norwegian coast. 



* Hippolyte Panschii, Bucholz, Die zweite Deutsche Nordpolarfahrt, 

 1869 und 1870, toI. ii. 1874, p. 277, pi. i. fig. 1. 



t Hippolyte Payeri, Heller, Crustaceen, Pycnogonideo, uud Tunicaten 

 (Esterr.-Ungar. Nordpol-Exped. p. 2, pi. i. fi{?s. 1-4. 



X Bythocaris leucopis, G. O. Sars, Den Norske Nordhavs-Exped. 1876- 

 78, Crustacea, I., 1885, p. 27, pi. iii. figs. 1-26. 



§ Bythocan's nana, S. I. Smith, " Report Decapod Orustacea ' Alba- 

 tross,' 1884," Annual Kep. Oomm. Fish and Fisheries, 1885, p. 56 (sepa- 

 rate copy), pi. xii. fig. 2. 



