GAMM.VniT)-E. 125 



Coxic of tlie second i)air cxcaviitcd to irecive tlio coxto of tlio 

 third pair. Coxa? of the tliird, fourth, and fifth pairs prod\K-od 

 l)o.stcriorly to a point ; basa of the same pau'S produced posteriorly 

 into two points; mera of the same produced posteriorly and 

 distally. Three posterior pairs of pleopoda subequal. Telson 

 emarginate, angular. 

 Length ^^-^ths of an inch. 



Ilab. Dublin Eay. Several specimens were taken by my friend 

 Prof. Kinahan fi-om the branchial ca\dties of Rhizostoma Cuvieri ; 

 the one that I had the opportunity of examining is preserved in the 

 Dublin Museum. Western coast of England i^Craerin-MeneviUe). 



3. Iphimedia nodosa. (Plate XXIII. fig. 1.) 

 Iphimedia nodosa, Dana, TJ. S. Exphr. Exped. p. 928. pi. 63. f. 3. 



" Eyes round. Body rather stout ; integiiment subcalcareous ; front 

 w-ith a short slender beak. Pleon subcaxiaate. Four anterior seg- 

 ments of pereion entire at posterior margin, fifth sinuous behind, 

 .sixth and seventh sparingly dentate. First throe segments of 

 pleon dentate on the back and sparmgly acuto-nodose on the 

 sides ; the rest naked. Three anterior coxte entire, obtuse ; fourth 

 bidentate behind ; tlu'ee following narrow and posteriorly acute. 

 Bases of last three pairs of pereiopoda subquadrate, unidentate 

 behind;" posterior angle acute. Inferior antennas the longer, 

 shorter than half the body. Gnathopoda and pereiopoda naked ; 

 gnathopoda quite small ; propoda minute. First two pairs of 

 pereiopoda larger than the gnathopoda; three posterior pairs a 

 little longer, subequal ; meros triangular, its posterior apex pro- 

 longed and acute. 



'* Length 4 lines. 



'' Hah. Hermit Island, Tierra del Fuego. Collected l)y Lieutenant 

 Case." — Dana. 



The near resemblance of this species to /. Ehlanie induces me to 

 retain it in this genus for the present, until future examination shall 

 determine the character of the maxilliped and the fonn of the gna- 

 thopoda. 



3.J. OTUS, n. g. 



Cephalon produced anteriorly. Pereion distended. Pleon comi)ressed. 

 Antenna- simple, sube(|ual. Man(li])les having an appendage. 

 Maxillipeds unguiculate. Ischium ha\'ing a broad i)late nearly as 

 long as the four succeeding joints ; bases furnished with a long 

 narrow process. Fii-st pair of gnathoj)oda chelate ; second sul)- 

 chelate. Pereiopoda sliort, robust, strong. Posterior i)!iii' of pleo- 

 poda biramouH. Telson single, s(]uamous. 



