470 



Memoirs of the Indian Museum. 



[Vol. V, 



large, plumose setae which increase in length proximally. In one specimen examined, 

 a large male, there were 4 setae on the inner portion of the inner lobe of the left maxilla 

 (see fig. 8, p. 465), while the right maxilla bore only the usual three plumose setae. 



The presence of three plumose setae or bristles on the inner lobe of the first 

 maxilla is so constant in the Ugiidae and Trichoniscidae, and the presence of only two 

 is such a constant character of the Oniscidae and other families, that the presence of 

 four on the one side of this specimen deserves more than a passing notice. Mr. 

 Collinge's recent paper (1914) shows, however, that there is very considerable varia- 

 tion in the oral appendages of many of the terrestrial Isopoda. 



The second maxilla (fig. 9, p. 465) is soft and membranous, broad and somewhat 

 thick ; its outer margin is sinuous and fringed with simple setae ; there is a small outer 

 lobe, much narrower and shorter than the inner lobe ; the inner lobe is broadly rounded 

 at the extremity, and has the whole of the distal margin thickly covered with short, 

 curved setae, pointing inwards; on the surface of the inner lobe are many longer, 

 simple setae. In L. oceanica, on the inner side of the second maxilla, there are two 

 hairy bristles which are mentioned and figured by Sars (1898, p. 155), who includes 

 them in the characters of the family Iyigiidae. These bristles, which are also men- 

 tioned and figured by Hewitt (1907, p. 9), are certainly present in the specimens of 

 L. oceanica that I have examined, but I can find no trace of them in L. exotica, and, 

 as I pointed out in 1901 (p. 106), they are not present in L. novae-zealandiae. 



The maxillipeds (fig. 10, p. 466) close in the mouth cavity behind and have the 

 outer surface fairly smooth or even, while the inner margin is produced at right angles 

 inwards, so as to lie between the bases of the maxillae and come nearly in contact 

 with the median lobe of the lower lip. The epipod is of small size and is fairly well 

 marked off from the rest of the maxilliped and is almost circular, with its margin 

 fringed with fine setae ; the palp is about half as long as the basal portion and is not 

 clearly divided into separate joints; the inner lobe is stout and thick and closely 

 fringed at its extremity with numerous short . stout spines, the inner margin bearing 

 numerous fine setae. 



The legs show the usual characters, the anterior ones being somewhat shorter 

 than the posterior, the seventh being the longest In the male the first three pairs 

 are slightly modified and broadened, the propod and dactyl folding back upon the 

 carpus, so as to form an imperfect subchelate appendage. The general shape and 

 arrangement of the various joints can be readily seen from the figures. 



In the male, in the first pair (fig. 11, p. 467) the merus and carpus are both some- 

 what widened and are of about equal length ; the inner margin bears only a few rather 

 small setae ; the propod is not quite as long as the carpus, and is much more slender ; 

 at the extremity it is produced slightly beyond the base of the finger into the small 

 oval lobe characteristic of the species. The dactylar seta is small, short, shorter 

 than the terminal nail and is slightly thickened at the extremity, being on the whole 

 very similar to the corresponding seta of L. novae-zealandiae. The second leg (fig. 12, 

 p. 467) is slightly longer and stouter than the first and has the carpus longer and stouter 

 than the merus ; the propod is similar to that in the first, but is not produced into a 



