Stiulies in Laguna Amphipoda. 641 



In Mr. Stebbing's key to tlie Gammaridae given in Das Tier- 

 reich, this runs to Neoniphargus, but diifers very markedly from it, 

 especially in the characteristics of the gnatliopods, uropods, and telson. 



Caliniphargus sulctis n. si^, 



Ej'es of good size. black. Side-plates of moderate depth, 1 — 4 

 much deeper than the following, the fourth the deepest and widest, 

 the fifth shallow and bilobed. Pleon segments 4 and 5 toothed 

 dorsally. Antenna 1 the longer; accessory flagellum two-jointed, 

 pedimcle not as long as flagellum, second Joint of peduncle slightly 

 longer than the flrst, much longer than the third; flagellum, 25—30- 

 jointed. Antenna 2 with peduncle longer than the 10 — 15-jointed 

 flagellum, ultimate and penultimate joints nearly subequal. Mandible 

 with molar well developed, 5 spines in spine-row^, cutting plates 

 dentate, palp 3-jointed. Maxiila 1, inner plate with fringe of eight 

 long, plumose spinules; outer plate with seven toothed spines; palp 

 2-jointed, longer than either plate, second Joint expanded and api- 

 cally fringed with blunt spines and a few setae. Maxilla 2, outer 

 plate the longer and larger; inner fringed apically and on inner 

 margin. Maxillipeds, inner plates rather short, well fringed along 

 apex and inner margin with plumose setae and a few short spines; 

 outer plates large, thickly armed with blunt spines; palp 4-jointed, 

 the third Joint broad, the fourth slender, apparently with nail, 



Gnathopod 1 of the female, second Joint long, with slender setae; 

 fourth Joint with stiff, short, brush-like spines behind; fifth Joint 

 both wider and longer than the sixth; sixth Joint with convex, 

 setose palm, finger small, fitting closely over the palm. Gnathopod 1 

 of the male similar to the female, but with the second Joint more 

 expanded; fifth Joint much longer than sixth; the sixth much ex- 

 panded apicallj' in front, band much excavate about palm, palm 

 transverse, spinöse, very small; finger very minute. Gnathopod 2 

 of the female somewhat larger than 1; fifth Joint as wide but not 

 as long as sixth; fifth and sixth joints, especially, thickly armed 

 wath slender spines, some of them Compound; finger strong, fitting 

 into groove along the finely serrate, slightly convex, oblique palm. 

 Gnathopod 2 of the male much larger than in the female; second 

 Joint slightly produced; third Joint long; fourth Joint produced into 

 small tooth at distal bind end ; fifth Joint about half as long as sixth, 

 cup shaped ; sixth Joint large, closely covered with Compound spinules, 

 palm oblique, not clearly detined; finger strong, fitting tightly into 



