128 



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

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

 the pennltimate pair laminarl}' expanded, that of last ])air much narrower, outer 

 joints in both pairs fringed with setsB and tufts of shoi't 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. 



Ecniarls. — The present genus estal)lished hy 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 Gamniaridcp, such as the genus Nipltargus, and for this cause 

 it was placed b}' Sji. Bate in the vicinity of that genus. Boeck was, however, 

 (juite right in renun'ing 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, 

 1 have Ijeen aide to distiiiguisli im less than 4 different species occiirring off 

 the coast of Norway. 



4 Bathyporeia norvegica, <!. 0. Sars, n. sp. 



(PI. 43). 

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



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

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

 combined, lateral corners slightly projecting and narrowly rounded. First 

 ])air of coxal plates terminating with an acute point, the 2 succeeding ones 

 each with a small dentiform projection at the tip, ])osteriorly. Last pair of 

 ej)imeral 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 s])ines 

 and 2 anteri(>rl\' curved bristles. E^'cs in female reniform, in male much 

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

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

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

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

 joint compressed, oblong, with several tufts of spines on l>oth edges, terminal 



