128 



setous 011 the inferior edge, the 2 succeeding joints narrow linear, dactylus want- 

 ing; the 2 posterior pairs rather strong and subequal in length, basal joint of 

 the penultimate pair laminaiiy expanded, that of last pair ranch narrower, outer 

 joints in both pairs fringed with setae and tufts of short spines, dactylus 

 rudimentary. Last pair of uropoda with the outer ramus very elongate, 

 biarticulate, inner small, lamelliform. Telson bipartite, each half linear, with 

 a tuft of spines at the tip, and another in the middle of the outer edge. 



Remarks. The present genus established by Lindstrom, is promi- 

 nently distinguished by the peculiar development of the 1st peduncular joint 

 of the superior antennae, as also by the very anomalous structure of the 

 posterior gnathopoda, and of the antepenultimate pair of pereiopoda. As to 

 the form of the last pair of uropoda, it somewhat reminds of certain forms 

 of the family Grammaridce, such as the genus Niphargus, and for this cause 

 it was placed by Sp. Bate in the vicinity of that genus. Boeck was, however, 

 quite right in removing it from that family and referring it to the family 

 Pontoporeiidse, with which it shows a much nearer relationship both in the 

 structure of the oral parts and in other anatomical characters. The genus 

 seems to comprise several very nearly allied species, which however have 

 been generally confounded with each other. Excluding the typical species, 

 I have been able to distinguish no less than 4 different species occurring off 

 the coast of Norway. 



4. Bathyporeia norvegica, G-. 0. Sars, n. sp. 



(I'l. 43). 

 ?Syn: Bathyporeia pilosa, Boeck (not Lindstrom). 



Body as compared with the other species rather robust, with broadly 

 vaulted back. Cephalon scarcely as long as the 2 first segments of mesosome 

 combined, lateral corners slightly projecting and narrowly rounded. First 

 pair of coxal plates terminating with an acute point, the 2 succeeding ones 

 each with a small dentiform projection at the tip, posteriorly. Last pair of 

 epimeral plates of metasome produced at the infero-lateral corners to a 

 short, but distinct tooth. First segment of urosome deeply impressed at the 

 base dorsally, and having, beyond the depression, 2 small juxtaposed spines 

 and 2 anteriorly curved bristles. Eyes in female reniform, in male much 

 larger, widening upwards and nearly contiguous, pigment dark red. Superior 

 antennae with the 1st joint of the peduncle longer than the other 2 combined; 

 flagellum in female composed of 8, in male of 13 articulations ; accessory 

 appendage about as long as the 2 last joints of the peduncle combined, 1st 

 joint compressed, oblong, with several tufts of spines on both edges, terminal 



