58 



sisting of seventeen joints, of which the first is the longest and 

 the last minute, all apically frinL;ed with inconsp'cuous sctules. 



Epistome strongly produced forward, its linguiform process 

 being just concealed by tlie nasiforni process of the head in a 

 dorsal view, the narrow arms Hanking the upper lip, which is 

 triangular above and has the slightly convex lower m(argin 

 covered with a thick moustache. Lower lip — The rotundo-quad- 

 rate lobes are rather strongly sctu'ose. In the stomach near the 

 entrance are two dark reniform masses very strongly setulose 

 round the adjacent inner and the hinder margins. These corre- 

 spond to Avhat in the Amphipoda I have called organs of tritura- 

 tion, but which Professor Delia Vallei names " cardiac folds" In 

 the Amphipoda they are often armed with numerous and power- 

 ful spines. The exterior of the stomach is covered like the rest 

 of the animal with little scale-like markings- 



Mandibles -The left mandible has the middle tooth of its 

 cutting plate simple, but the tooth on each side deeply bifid; in the 

 secondary plate there is one strong, horny-looking triangular 

 tooth, and three spine-like teeth, two of them short; there are 

 four or five crowded plumiose spines in th? spine-row, the molar 

 is strong, with setulcs at the base, the oval crown setulose, a little 

 serrate above, accompanied by a ])rojecting group of setae. The 

 right mandible has two simple teeth and a third feebly trifid in the 

 cutting plate, the secondary plate divided into feeble spine-like 

 teeth, the crown of the molar serrate along one edge- 



First maxillse — The outer plate is surmounted by eleven 

 crowded spines, the outermost but one being the strongest, the 

 innermost six slender, forming two sets, each consisting of three 

 graduated spines. Tlie inner ])late has th "ee p'um'os" setae on 

 the narrow apex- 

 Second maxillse — The outermost ])late has seven pectinate 

 spines: the middle plate carries six; the consilerably broader 

 inner plate is distall)^ fring^.d with several p'um~)se setae. 



Maxillipeds — The inner margin of the first joint forms a 

 rounded process beset with plumose setae; its external part forms 

 a broad base for the large distally narrowed epipod. The second 

 joint is elongate, its apical j^rocess, d s'ally fringed with setae, 

 reaches beyond the second joint of the i)alp. and somewhat above 

 its base has a strong spine-hook, nearly at the level reached by 

 the apex of the epipod. The first joint of the palp is small, the 

 second widened, cup-lilc.e, with the inner margin much longer 

 than the outer, the third joint similar but larger, and with less 

 difference between the two margins ; the fourth joinlt is nuich the 

 longest, oval, but with truncate apex, on which is placed the 

 small, but very distinct, oval fifth juint thi; like the three pre- 

 ceding joints having setce on the inner margin. 



First gnathopods — Though the seven ])airs f)f trunk limbs 

 are all very similar in character, the first pair have certain distinc- 

 tive features. Thev are the shortest, and have the sixth joint 



