313 



stretching along the propodos. Pereiopoda and nro]ioda about as in Monocu- 

 lodes. Telson oblong, i-ounded at the tip. 



Hemarlcs. — This new genus is established to include the Monoculodes 

 lomjhnanuis of Sp Bate (= M. Grubei Boeck), which in some points differs 

 very markedly both from the genus Monoculodes and from the preceding 

 genus, though being more nearly allied to the latter. As peculiarities of its 

 own may be noted the deviating structure of the gnathopoda, and the very 

 remarkable appearance of the eyes. Also in the structure of the oral parts 

 we find well-marked diiferences from both the above-named genera. The 

 genus comprises as yet but a single species, to be described in the sequel. 



]«. Perioculodes longimanus (Sp. Bate). 

 (PI. no, fig. 2, ri. HI, tig. 1). 



Monocnhulcs lonqimamm, Sp. liafc & Westwood, Bi'it. sessile eyed Ornstacea, Vol. II, 



Appendix, p. 507. 

 Syn ; Monoculodes Giubei, Boeck. 

 ,, Monoculodes feqviraanus, Norman. 



Body glabrous, and somewhat tumid in its anterior part, with broadly 

 rounded back. Cephalon but little exceeding in length the first 2 segments 

 of mesosome combined, rostral projection short and broad, triangular, lateral 

 corners evenly rounded ofP. First pair off coxal plates slightly expanded distally, 

 and somewhat obliquely truncated at the tip; 2nd and 3rd pairs oblong 

 quadrangular, with a small dentiform projection at the infero-posteal corners ; 

 4th pair nearly as large as the 3 preceding pairs combined, distal edge evenly 

 curved, infero-posteal corners somewhat produced, though obtuse at the tip ; 

 5th pair still broader but less deep. Eyes broadest in their upper part and 

 occupying the whole height of the forepart of the cephalon, pigment bright 

 scarlet, with about 12 brillantly iridescent lenses on each side. Superior 

 antennae in female about the length of the cephalon and the first 4 segments 

 of mesosome combined, the 3 joints of the peduncle nearly of equal length, 

 flagellirm scarcely more than half as long as the peduncle, and composed of 

 about G articulations; those in male having the 1st joint of the peduncle nearly 

 as long as the other 2 combined, and the flagellum fully as long as the peduncle, 

 with the 1st joint very large and densely clothed with sensory hairs. Inferior 

 antennae in female a little shorter than the superior, the last 2 joints of the 

 peduncle nearly equal in length, flagellum about as long as those joints com- 

 bined; same antennae in male more than twice as long, and having tlie 



40 — Crustacea. 



