THE PANDALIDtE 237 



in the arctic fiords of Norway. Lastly, Bell's Hippolyte 

 Thompsoni belongs to a difierent family, having been 

 identified with Eathke's Pandalus brevirostris. 



Naiiticaris, Merhippolyte, and Amphipledus, are said by 

 Spence Bate to differ from most of the other genera in the 

 family by having a series of arthrobranchise which are 

 elsewhere wanting, Chorismus, however, having a single 

 pair. 



Cryptocheles pygmcea, Sars, is only half an inch long, 

 and owes its specific name to its small size, but the generic 

 name, meaning ' with concealed chel^,' refers to the un- 

 usual circumstance that in the first trunk-legs the chelae 

 are so small as to escape notice altogether without close 

 inspection. This little species, found between 120 and 

 300 fathoms off the coast of Norway, brings forth its 

 young in a condition to require no special metamorphosis. 



Bythocaris resembles Cryptocheles in hatching the 

 young with their full number of appendages, and in in- 

 habiting very considerable depths. To this genus are now 

 referred Hippolyte Payeri, Heller, and Hippolyte Panschii, 

 Buchholz, besides the type species Bythocaris simplid- 

 rostris, Sars, Bythocaris nana, S. I. Smith, and a new one 

 obtained by the Norwegian North Atlantic Expedition 

 from 1,110 fathoms between Jan Mayen and Finmarken. 

 All the species are northern or distinctively arctic, and 

 the last, Bythocaris leucopis, Sars, is large and beautiful, 

 being nearly four inches long, and in colour a magnificent 

 rosy red. 



Family 4. — Pandalidce. 



The rostrum is long and slender, more or less abund- 

 antly armed with teeth or spines. The eyes are well 

 developed. The mandibles have a two- or three-jointed 

 pnlp. The first pair of trunk-legs are not chelate, the 

 second pair are chelate. The pleopods are biramous, the 

 tail-fan is well developed and strong. 



In this family Spence Bate discriminates seven genera. 

 In two of these, Ghlorotocus, A.Milne-Edwards, 1882, and 

 Boroddfe.i, Spence Bate, 1888, he states that the second 



