GAMMARIDEA. 



927 



Epimerals large, the fourth largest, fifth small. Maxillipeds broad, 

 the inner lamella large. Posterior caudal stylets two-branched, 

 branches oblong, similar, setigerous and not uncinate at apex. 

 Superior antennae usually the shorter. 



The species of Iphimediae are mostly found in the colder seas, and 

 among them, there is a tendency towards spinose or nodose forms. 

 They have generally the inferior antennae the longer, though not so 

 in all cases; moreover, these organs seem commonly to be nearly 

 naked. The epimerals are usually large, but unlike Amphithoe, the 

 fourth is the largest, and the fifth is abruptly very much shorter, 

 hardly exceeding the sixth in length, and anteriorly it occupies 

 usually a concavity in the posterior margin of the fourth epimeral. 

 These species are hence widely diverse from those of the following 

 group, and approximate to the Lysianassince. 



The outer maxillipeds have commonly broad joints, with a terminal 

 claw. The tarsi of the legs have often an inferior seta. 



Iphimedia simplex. 



Corpus compressum, nudum. Oculi orbiculares. Antennce fere nudce ; 

 2dce dimidii corporis lorigitudine, basi brevi, minus dimidio flagelli, 

 articidis flagelli transversis ; lmce paulo breviores, bad vix breviore 

 quam basis 2darum, articidis paucis inter se remotis processu infra 

 productis. Pedes toti breves. Manus prima sat parva, angusto-ovata, 

 apice subacuta. Manus secunda (an femince?) valde minor, sedformd 

 similis. Pedes 3tii Antique 2dis longiores, subcequi; 4 postici subosqui, 

 articulo primo latissimo, margine postico obsolete serrulato. 



Body compressed, naked. Eyes round. Antennae nearly naked; 

 inferior pair half as long as body, base short, less than half the 

 flagellum, joints of nagelluin transverse; superior pair a little 

 shorter than inferior, base scarcely shorter than base of superior, a 

 few joints at remote intervals produced below. Feet all short. 

 Hand of first pair moderately small, narrow ovate, apex subacute. 

 Hand of second pair (female ?) much smaller, but similar in form. 

 Third and fourth pairs longer than second, subequal. Last two 

 pairs subequal, first joint very broad, its posterior margin imper- 

 fectly serrulate. 



