360 G. 0. SAKS, 



number of these spines is generally on the 1st segment 8, on the 2nd 6. 

 In the last segment cccurs a dorsal fascicle of delicate hairs, and, in addition, 

 on either side of the dorsal face 2 spinules. 



The eyes are of an oval reniform shape, with well-developed visual ele- 

 ments and dark pigment. In some specimens, however, preserved from older 

 time in the Museum of St. Petersburg, and collected at Baku, no trace of 

 any ocular pigment was observable; but whether this was merely due to the 

 action of the spirit, or to some different nature of the pigment in those 

 specimens, I am unable to state. 



The autennse are comparatively short and but little different in length, 

 differing in this respect from what is the case in the typical Gammari. The 

 superior ones (fig. 2) but slightly exceed in length y^ of the body, and have 

 the 1st joint of the peduncle rather laige and longer than the other 2 com- 

 bined. The flagellum somewhat exceeds the peduncle in length, and is very 

 flexible, being composed of numerous short articulations, amounting to 

 20 — 24 in all. The accessory appendage is well developed, though scarcely 

 as long as the last 2 peduncular joints combined, and is composed of from 

 6 to 8 articulations. The inferior antennae are a little shorter than the 

 superior, and are more densely setiferous. The penultimate joint of the ped- 

 uncle is somewhat larger than the last one, and the flagellum about equals 

 in length those joints combined, being composed of 8 — 10 articulations. 



The gnathopoda (figs. 3,4) are moderately strong and somewhat unequal, 

 the posterior ones (fig. 4) being considerably more powerful than the an- 

 terior (fig. 3). In both pairs the carpus is quite short, triangular, and 

 expanded below to a narrow, setiferous lobe. The propodos is comparatively 

 large and tumid, especially in the posterior pair, and has the palm some- 

 what oblique, being defined below by an obtuse angle armed with several 

 strong spines. 



The 2 anterior pairs of pereiopoda (fig. 5) are unusually robust and densely 

 edged with slender bristles, especially along the posterior edges of the mo- 

 ral and carpal joints. The former joint is very large and expanded, and 

 also the carpal joint gradually expands somewhat distally, whereas the 

 propodal joint is of the usual narrow linear form. 



The posterior pairs of pereiopoda (figs. 6 — 8) are considerably more 

 slender, and have theii" outer part edged with numerous fascicles of delicate 

 bristles, and by a number of scattered spines. The antepenultimate pair 

 (fig. 6) are considerably shorter than the other 2, and have the basal joint 

 rounded quadrangular in form, with the anterior edge somewhat curved, 

 and edged with several fascicles of slender bristles, as also with a number 

 of small spines; the infero-posteal corner of this joint is somewhat project- 



$H3.-MaT. CTp. 340. ig 



