128 DR. C. CHILTOX ON THE 



sette on its inner margin near the apex, end witlv a dense row of simple hair-like setiie ; 

 inner lobe small, delicate, with tAvo hairy bristles. Second maxillae distinctly bilobed at 

 the extremity, outer edge not angularly produced near the base. Maxillipedes with the 

 basos rather narrow; masticatory lobe well developed, rounded at end, terminal portion 

 of fair size with the last four joints coalesced into a single triangular plate. Legs short, 

 not increasing much in length posteriorly. Pleopoda simple, opercular plates delicate, 

 and none of them with air-cavities. UropD'Ja rather jiroduced, base only i^artially 

 covered by terminal segment, rami not flattened. 



Jiemarka. — In general appearance this genus at first recalls Trichoniscus. The most 

 important character by which it is separated from other genera appears to be the structure 

 of the first maxillse, the outer lobe of which is very peculiar, and quite different from 

 that of any other Terrestrial Isopod that I am acquainted Avith.* In the mandibles with 

 the den'?e tuft of stiff setae apparently representing the molar tubercle and in the 

 maxillipedes this genus seems to resemble somewhat closely Sci/pJuu- ornalus, and the 

 two species of Actcecia described in this paper. Tiie type species, which is the only one 

 at present known, was found on the sea-beach within reach of high tides, and I at first 

 thought that the Philougria marina described by me in 1SS5 f would belong to the same 

 genus, but I find that it has the first maxillae normal, though, as Stebbing has recently 

 j)ointed out, the species cannot for other reasons come under Trichoniscus:^, and probably 

 will be found to belong to the ScyphacidEe. 



ScYPHOXiscrs AVAiTATEXSis, sp. nov. (Plate 14. fig. 1.) 



Specific description. — Body narrow oval, rather more than twice as long as broad ; 

 surface of cephalon and mesosome Avith small rounded tubercles and other irregulaiities, 

 generally forming a somev\hat irregular transverse row near the hinder edge of each 

 segment. Cephalon with the broad lateral lobes not very clearly defined at their bases, 

 front triangularly produced. Posterior margins of the first four segments of mesosome 

 straight, those of last three with tlie posterior angles more and more recurved posteriorly. 

 Metasome with the first segment short, second longer, third to fifth with moderate 

 appressed epimera ; last segment short, about twice as broad as long, triangular, ending 

 in a slightly rounded angle, sides concave. 



Antennae with the fifth joint of paduncle much longer than tlie fourth, flagellum as long 

 as the fourth joint, of three joints, the first short, second twice as long, third narrow, 

 about as long as the first, Avhole antennae covered with short stout setie. Legs short, 

 dactyla stout, with the secondary nail small or obsolete ; dactylar seta arising near the base 

 of dactylus, longer tlian dactylus, 2-branched, the outer the stouter and plumose, 

 inner one apparently simple. 



Colour brown. 



* Dollfus }ias flrawii attention to some abnormalities in the mouth-parts of McsaniHiiliUo Alluandi, Dollfus, 

 the most striking being that the inner lobe of the fir.st maxilke bears nine hairy bristles, instead of the two usually 

 ])rescnt in Armnill/Udi,um (Annales de la Socic'te Entom. de France (1892), l.Ki. p. 38C). 



t I'roe. Linn. Soe. N.S.W., ix. part ,S, p. 463. 



+ Troc. /ool. .Sof. London, ] 900, j). 5G5. 



