458 G- f>- SAKS, 



appendage rather elongated and 7-articulate. Guatliopoda in female rather 

 feeble, and almost equal, propodos of the posterior ones somewhat more 

 elongated than that of the anterior, and having the palm more transverse. 

 Pereiopoda considerably elongated, basal joint of the 3 posterior pairs very 

 narrow, and of uniform appearance in all of them. Last pair of uropoda re- 

 markably elongated, being more than twice as long as the nrosome, outer 

 rannis linear and densely clothed witli spines, inner ramus rudimentary. 

 Telson small, with the lateral lobes obtusely truncated at the tip, and each 

 armed with a single apical, and a lateral spinule. Length of adult female 

 13 mm. 



Remarks. — This is a very distinct species, and easily recognizable by 

 the slender form of the body, the peculiar form of the eyes, tlie acutely 

 produced lateral lobes of the cephalon, the slender and densely setous 

 antennae, the narrow form of the basal joint of the 3 posterior pairs of pereio- 

 poda, and finally, the extraordinary length of the last pair of uropoda. In 

 some points it would seem to approach the above-described 6. tenellus. 



Description. — The length of an adult, ovigerous female, not including 

 the last pair of uropoda, measures about 13 mm., and this form accordingly 

 is more than twice as large as its nearest ally, 6. tenellus. 



The body (see fig. 1) is very slender, though less compressed than in the 

 last-named species, and has the mesosome and metasome perfectly smooth. 



The cephalon (fig. 2) does not quite attain the length of the first 2 seg- 

 ments of the mesosome combined, and has the lateral lobes produced in 

 front to a rather conspicuous acute point, which is sometimes slightly de- 

 flexed. 



The anterior pairs of coxal plates are not very large, though somewliat 

 deeper than the corresponding segments. The 1st pair (see fig. 4) are quad- 

 rangular in form, the 2 succeeding ones (see fig. 5) a little narrowed in 

 their outer part. The 4th pair are but little broader than the preceding 

 one, and have the posterior expansion rather short. 



The epimeral plates of the metasome are of moderate size, the 1st pair 

 being, as usual, lounded, the other 2 but very slightly produced at the 

 lateral corners. 



The nrosome is conspicuously spinulose above, the spinules being, as 

 in G. tenellus^ arranged in 3 fascicles on each segment. The lateral fas- 

 cicles each contain on tlie 1st segment 4, on the 2nd 3, and on the last 

 2 spinules. 



The eyes (see fig. 2) are highly remarkable by their unusual shape, be- 

 ing extremely narrow, almost band-shaped, and occupying nearly the whole 

 height of the frontal part of the head. Their lower part is slightly dilated 



•I'Mj.-.M.iT. crji. 288. 38 



