CRYPTOMYSIS. 203 
CRYPTOMYSIS, gen. nov. 
Description (based on the female).— Body somewhat slender.— Carapace 
produced into a moderately large, triangular frontal plate (Plate 3, fig. 2a) and 
posteriorly not covering the entire cephalothorax. 
Eyes very large, with short stalks. Antennal squama (fig. 2b) somewhat 
elongate, lanceolate, narrow, with a transverse suture and setose along both 
margins.— Labrum obtuse in front, without process.— Left mandible (figs. 
2c-2e) has the incisive part well developed, a moderately strong, movable lobe, 
a couple of thick, digitate setae and the molar process somewhat long and thick; 
the palp is proportionately slender, its second joint (fig. 2e) somewhat curved, 
with its inner margin adorned with a row of regularly arranged, spiniform 
processes, each of which has a seta at the middle of its front margin; third 
joint of the palp rather short.— Maxillulae (fig. 2f) with the outer joint somewhat 
slender and a little angular at the middle of its exterior margin.— Maxillae 
(fig. 2g) somewhat elongate and narrow, with the exopod small and very narrow 
and the terminal joint not expanded distally and more than twice as long as 
broad.— Maxillipeds (fig. 2h) with first and second joints very long and moder- 
ately slender, first joint terminating in a free, minute lobe and second joint 
with a small lobe; third, fourth, and fifth joints each not longer than broad 
and without appreciable lobes; terminal joint small, triangular; claw well 
developed. 
Gnathopods (fig. 21) with second joint long and thick, without any real 
lobe; third and fourth joints somewhat small, transverse; fifth and sixth joints 
rather long, very slender and the fifth nearly naked; the claw somewhat long 
and strong.— The thoracic legs wanting excepting some exopods and a single 
endopod; the latter (fig. 2k) is slender, with fourth joint a little shorter than 
the fifth and a little longer than the sixth, which is divided by a transverse articu- 
lation near its end; only a few rather long setae on the endopod. 
Uropods (fig. 21) slender, with both rami setose along both margins as in 
the subfamily Mysinae; the otocyst well developed.— Telson (figs. 21 and 2m) 
quite aberrant; it is somewhat short, tapering considerably from the broad 
base to a little beyond the proximal two thirds of its length and then widening 
again, the terminal part being much broader than long, with the terminal margin 
nearly straight at the middle and broadly rounded at the sides; the whole 
margin of the terminal transverse part of the telson and the distal part of the 
lateral margins in front of that terminal part furnished with thick spines. 
