68 



Remarks. The above diagnosis refers only to the immature animal. In 

 the adult state, this form was first described, but not figured, by 0. Harger in 

 the above-quoted paper from a solitary specimen taken north of Cape Cod, from 

 a depth of 130 fathoms. Subsequently several more specimens were procured, and 

 some additional remarks on the species, accompanied by a habitus-figure and some 

 detail-figures, were given by the same author in another paper published in 1883. 

 It may thereby easily be demonstrated, that the form described by Dr. Bovallius in 

 the year 1885 as Hocinela Lilljeborgii, is the very same species, and, as, moreover, 

 it must be regarded as beyond all doubt, that this form only represents a more 

 advanced stage of the Harponyx pranizoides described in 1882 by the present 

 author, all these 3 forms ought to be combined into one species, for which the 

 name proposed by Harger, being the older one, must be retained. According to the 

 latter author, the species grows to rather a large size, the largest specimen mea- 

 suring 44 mm. in length. The specimen described by Dr. Bovallius had a length 

 of 22 mm. 



Occurrence. Only 2 specimens of this form, both very young and exactly 

 alike both in size and structure, have been examined by me. They were taken 

 up by the dredge in 2 different localities of the west coast of Norway, viz., at 

 Hvitingso and at Bekkervig, the depth ranging from 80 to 150 fathoms. 



Distribution.- Atlantic coast of North America (Harger), coast of Bohus- 

 lan, on the operculum of a whiting (Bovallius). 



Fam. 4. Cirolanidae. 



Characters. General habitus not unlike that in the JEyidw, though the 

 back is much more strongly vaulted, giving the body a more or less semicylindric 

 form. Cephalon with the front not produced in the middle. Coxal plates well- 

 defined on all the segments of mesosome except the 1st. Metasome normally 

 developed, with the terminal segment large, clypeiform, constituting together with 

 the uropoda a well-developed caudal fan. Eyes not very large, lateral. Antennae 

 very unequal, the superior ones being very small, the inferior long and slender. 

 Oral parts formed for biting and masticating, and accordingly of more normal 

 structure than in the ^Egidce. All legs ambulatory in character, though the 3 anterior 

 pairs may also serve for prehension, and the posterior ones for swimming. 



