26 



Occurrence. Some few specimens of this form, all of the female sex, have 

 been taken at different times, from depths of 50 60 fathoms. One of the spe- 

 cimens was found at Hanko, lower part of the Christiania Fjord, the others off 

 the west coast of Norway. 



Distribution. Scottish coast (Scott). 



Gen. 8. ZOSlme, Boeck, 1872. 



Generic Characters. Body of comparatively robust form, with the anterior 

 and posterior divisions, at any rate in female, well marked off from each other. 

 Cephalosome confluent with the 1st pedigerous segment, and produced in front to 

 a short and broad rostral plate. Epimeral plates of the 3 succeeding segments 

 well developed, sub-angular. Last segment of metasome abruptly narrower than 

 the preceding one. Urosome in female somewhat flattened, with the segments 

 more or less expanded laterally, in male more cylindrical in form. Genital seg- 

 ment in female with a very distinct transversal suture in the middle dorsally. 

 Caudal rami of moderate length, discontiguous, the 2 middle apical setae of a 

 soft consistency similar to those in Cervinia. Anterior antennae short and stout, 

 densely setiferous, 6-articulate. Posterior antennae with the outer 2 joints con- 

 fluent, outer ramus 3-articulate. Oral parts differing somewhat in structure from 

 those in the other Cerviniidce. Mandibles with the palp tri-lobate, inner lobe 

 confluent with the basal part, the other 2 constituting the 2 rami. Maxillae with 

 2 small knob-like projections outside the palp. Anterior maxillipeds short and 

 compact, with 4 digitiform lobes; posterior ones of comparatively simple structure, 

 3-articulate. First pair of natatory legs much smaller than the others, with the 

 inner ramus bi-articulate ; the 3 succeeding pairs with both rami slender, 3-arti- 

 culate. Last pair of legs somewhat resembling those in the Ectinosomidce, proxi- 

 mal joint exhibiting inside a well-marked setiferous expansion, distal joint im- 

 perfectly defined. 



Remarks. This genus, established by Boeck, was considered by that 

 author, as also by Prof. Brady, to be most nearly related to the genus Ectinosoma, 

 which in the present Account is regarded as the type of a distinct family, Ecti- 

 nosomidce. On a closer examination, however, I find that it should more properly 

 be referred to the family Cerviniidce. as here defined. True, the last pair of legs, 

 .as also the posterior maxillipeds, exhibit some resemblance to those in the genus 



