STEBBING— ISOPODA 97 



Locality. At anchor off Salomon Atoll, in surface net (Q). Several cryptoniscian 

 larvae were obtained on the same occasion. 



PONTOGELOS, n. g. 



Only the male known. Flagellum of first antennae of extraordinary length ; mandibles 

 as in other Eurydicidae with the molar part elongate-triangular, laminar, serrate on the 

 front margin, but with second joint of palp unusually long; second maxillae with the 

 middle lobe much narrower than either of the others and carrying a single seta ; 

 maxillipeds with hooks on the plate of the second joint; uropods with peduncle very 

 moderately produced on the inner margin, the outer of the membranaceous rami much 

 the smaller. 



The generic name is formed from ttovtos, sea, and ye'Xws, laughter, a joke, or, 

 colloquially, a lark, in allusion to the name of the exploring vessel. 



10. Pontogdos aselgokeros, n. sp. (Plate 8 b.) 



To the generic characters above given might possibly be added the comparative size 

 of the pleon which equals in length the anterior part of the animal, but nearly the same 

 proportion is attained in Eurydice elegantula, Hansen. As will be seen from the figure 

 I have given of the lower lip, that part differs greatly from the form generally found 

 in this family. My dissection, however, did not afford an entirely satisfactory view of 

 it, so that I cannot lay much stress on the representation. 



The head is rather strongly produced, with the rostral point bent over towards 

 the frontal lamina which is spatulate with flattened distal margin. The peraeon and 

 pleon are nearly parallel-sided. The first peraeon segment has the produced front corners 

 rounded. The side-plates of the six following segments are neither deep nor acute. The 

 large telsonic segment has a length equal to its breadth at the base, from which it 

 presently widens, then curves to a subrotund ending. For rather more than its distal 

 third its finely serrulate margin is fringed with setae of moderate length, the central 

 point having a couple of setules, and about midway of the fringing a scarcely perceptible 

 angle is formed. The segment itself, except at the base, like the uropods, is pellucid. 



The eyes are large, roughly rounded, in spirit light orange-brown. 



The first antennae have a stout, almost round, first joint, followed by a much 

 smaller joint which is probably the true third, unless that is represented by what 

 looks like the first joint of the slender, monstrously elongated, flagellum. This with its 

 ninety joints extends considerably beyond the telsonic segment. It is true that Hansen 

 in his conspectus of this family speaks of some genera having numerous joints in the 

 first antennas, but what has hitherto been considered as long is a flagellum of fifteen 

 joints reaching the hind margin of the third peraeon segment, as in Cirolana chiltoni, 

 H. Richardson, 1905. 



The second antennae are here contrary to custom much shorter than the first, yet 

 absolutely they are of unusual length, having a flagellum of fifty joints. The fifth joint of 

 the peduncle is about once and a half as long as the fourth. 



SECOND SERIES— ZOOLOGY, VOL. XIV. I.i 



