414 



these the present form may be easily distinguished by the comparatively 

 small size of the cephalon, and by the 2 superposed dorsal projections of the 

 urosome. 



Occurrence. Though nowhere in any abundance, this form would 



seem to occur along the whole coast of Norway, from the Christianiafjord 

 to Vadse. It is a true deep-water form, only occurring in depths ranging 

 from 100 to 400 fathoms. 



Distribution. Stat. 18 & 295 of the Norwegian North Atlantic 



Expedition, both lying outside the great fishing banks of the west coast 

 of Norway. 



Fam. 17. Eusiridae. 



Body generally rather slender, now compressed, now more cylindric 

 in form, with the metasome powerfully developed. Cephalon not very large, 

 more or less produced in front, and having the inferior edges incised to 

 receive the large basal joint of the inferior antennae. Coxal plates now of 

 moderate size, now very small, 1st pair always expanded distally. Antennae 

 comparatively slender, with elongated peduncles, the superior ones provided 

 with a very small accessory appendage; those of male more or less distinctly 

 modified. Oral parts of normal structure. Mandibles having the molar 

 expansion well developed, and the terminal joint of the palp much elongated. 

 Maxillipeds rather large, with strong palps. Gnathopoda subequal, and rather 

 strongly built, with the propodos large and subcheliform. The 2 anterior 

 pairs of pereiopoda generally very slender and shorter than the 3 posterior 

 ones, which successively increase in length and have the basal joint moderately 

 expanded. Last pair of uropoda somewhat differing from the preceding pairs, 

 having the rami more or less foliaceous. Telson very large, and with the 

 outer part cleft. 



Eemarks. This family was established in the year 1888 by the Rev. 

 Mr. Stebbing, to include the genera formerly referred by Boeck, to his sub- 

 family Leucothoina, with the exception of the genus Leucothoe, which was 

 considered as the type of a separate family. He refers, besides, to the same 

 family 2 new genera, viz , Cleonardo and Eusiroides. The family is here taken 

 in a somewhat more restricted sense than is done by Mr. Stebbing, the genus 

 Lilljeloryia being excluded, on account of its very striking difference from the 

 other types, especially as regards the very fully developed accessory appendage 

 of the superior antennae, and the well-pronounced sexual difference in the 



