154 A.MrniPODA NORMALfA, 



Epimer'm, which, as far as it, together "wnth the following descrip- 

 tion of the s])ecies, enables mc to offer an opinion, differs in nothing 

 from Acanthonottis of Owen, of which probably it is a .sj-nonyra, as 

 E. tricristata appears closely to resemble A. Tcstudo of Montagu. 



1. Epimeria tricristata. 



Epimeria tricristata, A. Costa, Cat. dei Crost. Ital. per Fr. Gvgl. Hope, 

 p. 4(>. 



" Last segment of the thorax and first four of the plcon dorsally 

 earinated, and posteriorly produced into o tooth. The four ante- 

 rior segments of the pleon also have a lateral obsolete carina, and 

 are produced posteriorly into spiniform teeth, the third and fourth 

 being inferiorly and posteriorly angulated. Coxa of the first pair 

 of pereiopoda ^vith an infero-anterior angle, coxa of the second 

 with an infero- posterior angle oblicjuely produced, and together 

 forming an inferiorly emai'gino-semilunate shield. Antenna; 

 resembUng those of Atyhts carinatus. Gnathopoda of medium 

 size ; second pair rather the larger ; propoda compressed, oval. 



" Length 6 lines. 



" Hah. Coast of IS'aplcs."— ,1. Costa. 



45. EUSIRUS. 



Eusirus, Kroi/er, Tidsh\ (2) i. p. 501. 

 Cephalon not rostrated. Pereion and pleon compressed, much re- 

 sembling Atylus. Superior antenna; long and slender, having a 

 secondaiy appendage ; inferior antennae having the peduncle 

 longer than the peduncle of the superior. Mandibles having an 

 appendage. Maxillipeds unguiculate, having a small squamous 

 plate to the coxa, basos, and ischium. Gnathopoda uniform, each 

 having the propodos large, with the postero-iuferior margin poste- 

 riorly produced ; carpus attached to the propodos neai' the centre of 

 its superior margin; infero-anterior margin produced along the 

 inferior margin of the propodos. Pereiopoda slender, subequal. 

 Posterior pair of pleopoda biramous. Telson long, narrow, cleft at 

 the apex. 



1. Eusims cuspidatiis. 



(Plate XXYIII. fig. 6 ; fig. 7, young.) P.M. 



Eusirus cuspidatiis, Kroycr, Tidskr. (2) i. p. 501. pi. 7. f. 1 ; Voyage 

 en Scand. pi. 19. f. 2. 



Pereion having the posterior dorsal margin of the last two segments 

 produced into teeth. Pleon haring the first two segments similarly 

 produced ; fourth segment ha-\-ing a central dorsal sinus, Eyes 



