of the North Atlantic and of North- Western Europe. 723 



" Testa feminse sat ventricosa, a latere visa oblongo-ovata, vix duplo longior 

 qnam altior, altitudine maxima paulo ante medium sita, extremitate antica rotun- 

 data, postice obtusa, margine dorsali sequaliter arcuato, angulmu tamen obscurum 

 supra oculum formante, ventrali medio perparum sinuato ; supra visa late fusi- 

 formis, latitudine maxima fere altitudinem sequante paulo pone medium sita, 

 extremitate utraque acuminata. Valvulse subequales, sat tenues, nitidse, pilis dense 

 obsitse. Color obscure fuscatus, supine macula magna viridi irregulari, utrinque 

 in fascias duas angustas diagonales retro vergentes exserta. Setae natatorise 

 antennarum superiorum sat elongatse, eeedem inferiorum vero brevissimse et 

 rudimentares. Ungues apicales antennarum inferiorum et pedum primi paris 

 subtiliter denticulati. Rami caudales mediocres apicem versus attenuati, unguibus 

 dimidiam rami longitudinem superantibus, seta marginis dorsalis tenui unguibus 

 approximata. Longit. testae, !• 60 mm." 



Distribution. — Vardo, in East Finmark, and in marshes at Advent Bay, Spitz- 

 bergen (G. 0. Sars). 



Our figures are taken from types received from Professor Gr. 0. Sars. 



Genus Ilyodeomus, G. 0, Sars. 



" Contrib. Knowledge of Freshwater Entomostraca of New Zealand " (Videns- 

 Selks. Skrifter, 1894), p. 38. Separate copy. 



" Shell highly compressed and, seen laterally, oblong in form, with the dorsal 

 edge straight in the middle, the ventral more or less sinuated. Valves generally 

 not very unequal, the left one being in every case the larger, inner duplication 

 very broad and shelf-like. Surface of shell in most of the species striated longi- 

 tudinally. Setae of the superior antennae shorter than in Candonoci/pris, those of 

 the inferior ones poorly developed, not reaching beyond the terminal claws. 

 First pair of maxillae of nearly the same structure as in the genus Candonoci/pris. 

 Caudal rami, on the other hand, much coarser, and armed with three strono- claws 

 increasing in length distally. Animal quite devoid of swimming power. Propa- 

 gation exclusively parthenogetical." 



In this genus the caudal rami have " three instead of only two claws the 

 dorsal seta being here replaced with a claw of the same ajDpearance as the 

 other two." 



To this description of Sars we may add that the chief teeth of the external 

 member of the first maxillae are strongly dentated on the edges, as in the genera 

 Cypris and Herpetocypris. 



One of the following species Sars has himself referred to this genus- but 

 to admit all the description of the dorsal margin of the shell will require 

 modification. 



