139 

 Gen. 3. EehmOZOne, G. 0. Sars, n. 



Syn: Ih/amclnia, G. 0. Sars (pnvt). 



Generic Characters. Body somewhat resembling in shape that in the genus 

 Ilyarachna, but comparatively shorter and thicker, with the anterior segments of 

 mesosome strongly spinous, the 3 posterior segments short and broad. Caudal 

 segment distinctly notched on each side, at some distance from the tip. Antennae 

 about as in Ilyarachna. Mandibles very large and without a trace of palps. 

 Ambulatory legs resembling those in the genus Ilyarachna; natatory legs, on the 

 other hand, far less fully developed, with the outer joints but slightly expanded. 

 Uropoda with 2 distinct rami issuing from the outer side of the large, lamellar 

 basal part. 



Remarks, This new genus is founded upon the form previously described 

 by the present author as Ilyarachna coronata. On a closer anatomical examin- 

 ation of this form, I have found it to differ in some particulars rather markedly 

 from the 3 above-described species, so that it ought more properly to be regarded 

 as the type of a nearly-allied genus. Among these differences may be named the 

 absolute absence of mandibular palps, and the biramous character of the uropoda. 

 The genus comprises as yet but a single species. 



Echinozone coronata, G. 0. Sars. 



(PI. LXI, fig. 2.) 



Ilyarachna coronata, G. O. Sars, Nye Dybvamlscrus l aceer fra Lofuten. Clir. Vid. Selsk. Forlidl. 



1869, p. 168. 



Specific Characters. Body very short and compact, scarcely more than 

 twice as long as it is broad. Cephalon with the dorsal face strongly vaulted and 

 perfectly smooth, lateral parts obliquely expanded. Anterior edge of the first 4 

 segments of mesosome considerably raised, and divided into 6 8 coarse spiniform 

 projections, between which are as many very small denticles, lateral parts of 1st 

 segment simple, those of the 3 succeeding segments each produced into 2 acute 

 lappets. The 3 posterior segments of mesosome comparatively short, and, com- 

 bined, not nearly attaining the length of the anterior division, dorsal face some- 

 what uneven, anterior edge of 1st segment slightly denticulated. Caudal segment 

 scarcely longer than it is broad at the base, lateral edges minutely setous, and 

 exhibiting, at some distance from the tip, a very distinct notch denned in front 

 by a dentiform projection, tip acutely produced. Superior antenna? not reaching 

 to the middle of the antepenultimate peduncular joint of the inferior ones, basal 

 joint of moderate size and without any denticles, nagellum 10-articulate. Inferior 



