290 G. 0. SARS, 



The oral parts (ligs. 5 — 1 1) are of quite uornial structure, and need uot 

 therefore be described in detail. 



The anterior gnathopoda (lig. 12) likewise exhibit quite a normal ap- 

 pearance, being moderately strong and rather densely setiferous. The pro- 

 podos is somewhat tumid, and of an ovate, or rather obpyriform shape, with 

 the palm not defined below by any distinct angle, but carrying at the junction 

 with the hind margin the usual spines. 



The posterior gnathopoda (fig. 13), on the other hand, are quite unlike 

 the anterior, and of a rather peculiar structure, strongly reminding of 

 that characteristic of the genus (rammar acanthus. They are much larger 

 than the anterior ones and considerably elongated, being also much less 

 densely setiferous. The basal joint is large and dilated on the middle, ex- 

 hibiting a somewhat fusiform shape, and is filled with strong muscles moving 

 the outer part of the leg. The 3 succeeding joints are comparatively small 

 and narrow, the carpal one being produced below to a short and narrow 

 setiferous lobe. The propodos is exceedingly large, and gradually expands 

 distally, acquiring thereby a somewhat flattened sliape. The palm is longer 

 than the hind margin and obliquely curved, its edge being sharpened and 

 fringed with a regular row of small bristles. The defining angle is very 

 slight, and is (see fig. 14) armed with 3 comparatively short spines, behind 

 wliich there are 2 or 3 fascicles of comparatively short bristles. Inside the angle, 

 as in most other Gamraaridje, 2 juxtaposed spines occur, the outer of which is 

 exceedingly slender and elongated. Between these 2 spines and those of the 

 defining angle the tip of the slender, falciform claw is received when impinged. 



The anterior pairs of pereiopoda (figs. 15, 16) do not exhibit any es- 

 sential peculiarity in their structure. They are rather densely setous and 

 somewh;>t unequal in size, the 1st pair (fig. 15) being the larger. 



The 3 posterior pairs of pereiopoda (figs. 17 — 19) are comparatively 

 strongly built and not much elongated, being provided in their outer part 

 with fascicles of slender bristles. The antepenultimate pair (fig. 17) arc, as 

 usual, somewhat shorter than the other 2, and have the basal joint oval 

 quadrangular in foiiii, with the anterior edge slightly curved and throughout 

 provided with fascicles of slender bristles. The basal joint of the penultimate 

 pair (fig. 18) is more elongated and somewhat narrowed distally, with 4 

 fascicles of bristles on the outer part of the anterior edge. The last pair 

 (fig. 1 D) are distinguished by the large size of the basal joint, which forms 

 posteriorly a broad lamellar expansion terminating below in a rounded lobe. 

 The edges of the expansion are obscurely serrate, but without any trace of 

 bristles. On the other hand the anterior edge of this joint is very densely 

 setiferous in its outer part. 



^U3.-M:lT. CTp. 198. 1 6 



