553 



Inferior antennae much shorter than the superior and more strongly built, 

 with the flagellum scarcely longer than the last peduncular joint. Anterior 

 gnathopoda in female with the basal joint simple, not expanded distally, 

 propodos about the length of the carpus, and oblong oval in form, scarcely 

 widening distally, palm rather short, dactylus slender; those in male some- 

 what larger than in female, and having the basal joint expanded at the 

 infero-posteal corner to a rounded lobe, carpus exceeding the propodos in 

 length. Posterior gnathopoda in female somewhat more elongated than the 

 anterior, basal joint fringed on both edges with ciliated setae, those of the anterior 

 edge being very much elongated, propodos somewhat longer than the carpus, 

 and slightly tapering distally, with the palm very short, and the dactylus 

 small; those in male very powerfully developed, with the carpus much 

 tumefied, and having the upper face boldly curved, propodos somewhat 

 shorter than the carpus and oval in form, with the lower edge divided into 

 several strong serrations having between them fascicles of slender bristles, 

 dactylus rather strong. The 2 anterior pairs of pereiopoda with the meral 

 joint rather large, equalling in length the 2 outer joints combined, and, 

 especially in the 1st pair, densely setous, basal joint in the latter pair 

 fringed with long ciliated setae in a similar manner to that of the posterior 

 gnathopoda. Last pair of pereiopoda not nearly attaining half the length 

 of the body, basal joint oblong oval, with the posterior edge setiferous. 

 Last pair of uropoda with the inner ramus considerably shorter than the 

 outer, both armed with several strong spines, the outer one, in addition, being 

 tipped with a slender bristle. Telson broader than it is long, and armed on either 

 side of the obtusely truncated tip with 3 slender spines. Body whitish, 

 with very distinct dark brown bands across the segments and coxal plates. 

 Length of adult female 8 mm. of male about the same. 



Remarks. The present form was first described by Kr0yer, under 

 the above name, from Greenlandic specimens. It was subsequently recorded 

 by Prof. Lilljeborg from the Swedish coast under another name, viz, 

 Gammarus macronyx, and by Bruzelius as Autonoe macronyx. Boeck 

 erroneously identified Microdentopus Websteri of Sp. Bate with this form. 

 It is easily recognized from the other Photidce both in the female and male 

 sexes, in the former, by the dense supply of ciliated setae on the basal joint 

 of both the posterior gnathopoda and the 1st pair of pereiopoda, in the latter, 

 by the peculiar structure of the posterior gnathopoda. 



Occurrence. - - Along the coast of Finmark this form is very frequently 

 met with in moderate depths, from 6 to 30 fms. It is also found at the 

 Lofoten Isles, and in several places on the Nordland coast Even in the 

 Trondhjemsfjord, it is in some places very abundant, and, according to Boeck, 



