522 



palm nearly transverse and distinctly defined below. Posterior gnatbopoda 

 in female considerably stronger than the anterior, propodos rather large and 

 oblong oval in form, with the palm very oblique and imperfectly defined 

 below; those of male very powerfully developed, propodos exceedingly large, 

 nearly pyriform in shape, palm very oblique and armed with 2 distinct 

 dentiform projections, in front of which there is a rounded lobe edged with 

 small denticles, dactylus very strong and curved. The 2 anterior pairf. of 

 pereiopoda of moderate size, with the propodal joint longer than the carpal one, 

 and edged posteriorly with several strong spines. The 3 posterior pairs of 

 pereiopoda exceedingly robust, with the basal joint very large and laminar, 

 especially in the last pair, and the meral joint considerably expanded distally, 

 being produced on both sides of the insertion of the carpal joint; penultimate 

 pair the longest. Last pair of uropoda projecting somewhat beyond the others, 

 and rather stout, outer ramus somewhat larger than the inner, and provided 

 on the outer edge with 2 dense fascicles of spines, tip of both rami obliquely 

 truncated and densely spinous. Telson rather broad, laminar, scarcely 

 tapering distally, cleft very narrow, fissure-like, and extending nearly to the 

 base, terminal lobes obliquely truncated at the tip, each with from 3 to 4 

 strong apical spines. Colour in the living state of the animal, not yet stated. 

 Length of adult female 8 mm, of male about the same. 



MemarTis. — This form was first described by Costa from the gulf oi 

 Naples, and was subsequently recorded by Sp. Bate under another name, viz, 

 Megamcera hrevicaudafa. Boeck, who examined a Norwegian specimen, did 

 not recognize in it the typical form, but described it as a new specie.' 

 JE. latipes. It is easily distinguishable from any of the other norther 

 Gammaridse by the unusual robust posterior pairs of pereiopoda, as also b 

 the structure of the last pair of uropoda, and that of the telson. 



Occurrence. — I have never myself met with this form, but Boec 

 states its occurrence in the Christianiafjord. The figures here given ar 

 from French specimens kindly sent me by M. Chevreux. 



DistrihuHon. — British Isles (Sp. Bate), coast of France (Chevreux) 

 Mediterranean (Costa), Azores (Barrois). 



