BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 27. APD. IV. N:0 8. . 41 



some of the eggs nearly whole the yolk was consumed, and 

 the hind part of the body of the embryo had protruded from 

 the embryonic membrane. In others the embryo was in a 

 much less developed stage. The eggs are, comparatively 

 speaking, very large and few in number as must be expected, 

 considering the fact that the embryo does not leave the ple- 

 opods of the mother, before it has reached its complete state of 

 development. As among so many animals inhabiting either 

 the Arctic or Antarctic Oceans or the deep-sea, that rule 

 seems to prevail also in the class of crustaceans. It was G. 

 O. Särs, who, when examining Bythocaris simplicirosfris, the 

 type of the genns, first called attention to the great size of 

 the eggs as possibly indicating a peculiar and abbreviate 

 development. Other Arctic Decapoda exhibit the same con- 

 dition. DoFLETN^ points out among such decapods Hippolyte 

 polaris, H. spinus, H. Gaimardii, and Sclerocrangon horeas. 



The colour of Bythocaris leucopis is a bright red with a 

 lighter tint on the antennee and the sides of the abdomen. 

 The eyes are opaque white, as the specific name implies. 



Lengfh of my largest specimen from stat. 29, 1900, 77 mm., 

 or, whith the antennal scalet, 95 mm., exactly the same length 

 as Särs' greatest specimen attained. 



15. Bythocaris Payeri (Heller). 



1878. (1875). Hippolyte Payeri Heller, Crust., Pycnogon. and 



Tunicat. etc, 1. c. p. 26, taf. I, tig. 1—4. 

 1877. Bythocaris Payeri G. O. Särs, Prodr. descript. Crust. etc, 



1. c p. 240. 

 1882. » payeri Hoek, Crust. »Willeni Barents> etc, 1. c. 



p. 19, taf I, lig. 8—9. 

 1885. » Payeri G. O. Sars, Norw. Xorth Atlant. Exp., 1. 



p. 33, pl. III, fig. 27. 

 1897. t> payeri BiRULA, Essai d'une faune des crustacés 



décapodes etc, 1. c. p. 428. 



Localities: 



in 1898: 



stat. 40. lat. 79' 58' N., long. 9° 30' E., 19 — 20 miles N.W. of Danish 

 Island, depth 435 m., bottom temp. + 1,5' C, gray clay, 



1 1. c. p. 355. 



