CRl'STACKA MAUACOSTRACA. III. 



I6 7 



i- somewhat long, rather narrow, as in the other forms of the genus without coupling hooks, and 

 tci initiates in two extremely long, stiff, plumose setae. 



Epimera in the main similar to those in K. inermu\ the outer (lower) margin of the three post- 

 erior pairs is unusually convex, and their posterior angle is produced into a quite minute, acute tooth. 

 Thoracic legs (figs. 5 f, 5 g, 5 h) with very few setae and a smaller number of spines than in any 

 otlu-r Huropean species. Seventh pair (fig. sh) slender excepting second joint; fourth joint only a little 

 less than twice as long as broad and about as long as the fifth, while sixth joint is about half as long 

 again as the fifth. 



Last abdominal segment (fig. 5 i) without any distinct dorsal impression ; the lateral margins 

 are curved a little upwards with the result that the surface along them is a little excavated. Posterior 

 margin long and on the whole moderately convex, with a very obtuse and feeble angle at the middle, 

 \\hile each half of this margin has some irregular, somewhat to very small teeth and a few quite 

 short seta, but no articulated spines. 



The appendix masculina (fig. sk) attached nearer the base of the endopod than in any other 

 I. -nil of this genus; the appendix reaches somewhat beyond the ramus, and its distal part is peculiarly 

 shaped, as may be seen in the figure. 



Uropods (fig. 51) small; both rami considerably narrower than in any other European species 

 and shaped nearly as in some forms of Cirolana, slightly more than three times as long as broad and 

 tapering from the middle to the narrow end, which has a small incision; the endopod is considerably 

 longer than the exopod, with the distal half of its outer margin coarsely serrate and that of the inner 

 margin very finely serrate; the margins of the exopod with a couple of saw-teeth. 



Colour of the specimen while in formaline a few months after capture deeply high-red. 



Length 7-1 mm. 



Remarks. E. caeca is a most interesting species, differing from other forms of the genus in 

 having no eyes, in the size and shape of the frontal plate, in the antennulae, the proximal insertion 

 of the appendix masculina, the shape of the uropods, and finally in colour. But as it agrees with 

 other North-Atlantic forms in the peduncles of the antennae, the mouth-parts, the essential features of 

 the thoracic legs, etc., it was deemed incorrect to establish a new genus for its reception. 



Occurrence. Taken only by the Thor", July n, 1904, at the following place. 

 South of Iceland: LaL 6i3o' N., Long. ijoS W, young-fish trawl, 1800 in. wire out; i spec. 

 Judging from the absence of eyes, the colour and the length of wire out A, caeca belong* to 

 the pelagic deep-sea fauna. 



Sub-Family ^Egidae. 



The main paper on the forms is still that published by Schiodte & Meinert in Naturh. Tidsskr. 

 3. R.-ekkc. Vol. XII, 1879, The authors, who had studied a vast material from nearly all large museums 

 in the world, pronounced that females with marsupial lamella: had never been taken on fishes, but 

 had. if known, always been taken by the dredge. Of the North-Atlantic and arctic forms of the genus 



