75 

 Gen- : Cyproniscus^ Kossniaiin. 



1884. CyproiiisctiSj Kossmanii, Sitzungsbcrichte K- Akad. Wiss- 



Berlin, Hell 22, p. 4O0. 

 1887. Cyproniscus, Giard and Bonnier, Travaux de Wimereux, 



iiopyriens^ p. 220. 

 1893. Cyproniscus, Stebbing_, History of Crustacea^ p- 397- 

 1898. Cyproniscus, Sars, Crublacea of Norway, vol 2^ p- 232, 

 1900. Cyproniscus, Bonnier^ Travaux de \\ inicreux, vol. 8, p. 



.^91- 

 Sars gives the following dciinition of the genus: — 



" Body of the adult female forming an inert curved sac wholly 

 hlled with ova or enibryos_, and affixed lo the host by the aid of a 

 thin flexible cord; dorsal face convex and exhibiting distinct 

 traces of segmentation, ventral face liattened, lateral parts ex- 

 panded, anterior extremity broadly produced, posterior obtusely 

 rounded and incurved. Body of immalture female sub-pyriform, 

 bluntly truncated in front, hind extremity narrowly exserted, 

 lateral parts not distinctly defined- Body of }oung female, imme- 

 diately after the transformation subfusiform, very faintly seg- 

 mented, front part still enveloped by the larval skin, and deeply 

 immerged within the body of the host, being anchored by a pair 

 of long, fiexuous, root-like processes. Adult male exactly re- 

 sembling the female larva of last stage, being rather slender, and 

 without eyes ; hind expansion of basal joint of antennule divided 

 mto a restricted number of teeth, coxal plates coarsely pectinate ; 

 outer ramus of uropoda much smaller than the inner- Parasitic 

 on Ostracoda-," 



The single species for which the genus was founded, and on 

 which the above definition is leased, was originally described by 

 Sars in 1882 uaddr the nam ^ ot Cyyidotliiria cypridmac, the 

 specimens having been found infesting Cvpridtna norvegicay 

 Baird. So far as the material permits a decision, the new species 

 about to be described agrees accurately with the g-encric defini- 

 tion drawn up by Professor Sars, except in one particular. In 

 the new species the outer ramus of the uropoda is very little 

 smaller than the inner. 



In the male and last larval stage of female llie type species 

 shows the terminal segment with an undivided margin. In the 

 new species the margin is divided into teeth. This character is 

 found also in the larval parasite of .icga vcnirosa, M. Sars, de- 

 scribed by G- O. Sars as " Cryptoniscid No- 2 " in the Crustacea 

 of Norway, vol- 2, p. 246, pi. 100, fig. 3. Further, in Hansen's 

 Isopodcn, Cumaceen und Stcnuatopoden der Plankton Expedi- 

 tion, 1895, it appears clearly in the lar\'?e which he designates 

 Entonisiits «, BovN'us a, Jiof^ynis 7, Bopyrus c. That such a 

 peculiarity should be common to the parasites of Ostracoda, of 

 Isopoda, and of one or more higher r\Talacostracan groups, is 

 worthy of notice, as one more link connecting the numerous 



