TEERESTKIAL ISOPODA OF NEA\^ ZEALA]!^©, 121 



quadrangular; surface convex and a little uneven, Avith depressed line parallel to hinder 

 margin ; posterior margin slightly convex and fitting evenly into the space between the 

 rather small side-plates of the fifth segment. 



Eyes rather large, convex, with about 40 ocelli. .Vntennula? apparently 1-jointed 

 and immobile. Antennte reaching to jjosterior border of the first segment of mesosome, 

 last joint of peduncle jibout twice as long as the fourth and as long as the fiagellum ; 

 fir,st joint of flagellum strongly geniculate with the peduncle, of the same length as the 

 second, thii-d rather longer, fom-th very small, almost rudimentary ; the whole antennae 

 covered with numerous short, bluntish sette. 



First pair of legs with anterior margin of the basos produced near the distal end into 

 a triangular process, and with a shallow groove posterior to this for the reception of the 

 distal portion of the limb when bent back ; second pair with similar but less marked 

 structure; legs scarcely increasing in length posteriorly, all very setose, the setae on the 

 posterior pairs larger and stouter than on the anterior pairs. 



Eifth pleopoda with the exopodites .strongly chitinised, large, trapezoidal, articulated 

 at the postero-lateral angles, and projecting inwards and forwards so as to meet in the 

 median line and cover a large portion of the anterior pleopoda. Uropoda triangular, 

 outer side convex and with a few setae, inner margin straight, fringed with fine setae, 

 terminal joint small, bearing a few fine setae. 



Colour. — Whitish or light yellow, with scattered black spots and usually with opaque 

 white or silvery spots arranged more or less closely in patches; some of the specimens 

 darker, especially along median line. 



Length. — Al)0ut 14 mm. 



Ha'ntat. — Lyall's Bay, ATellington [11. M. Luiiuj), "Wellington, under tussocks near 

 the beach" {(}. 31. Thomson). 



Remarks. — I have some hesitation in describing this as a new species, for all the 

 species of the genus appear to be very similar in general appearance and to be distin- 

 guished chiefly by diS'erences in the front of the cephalon and the pleopoda, which are 

 somewhat difficult to describe accurately. It is probably not very different from 

 Tylos spiiiulosus, Dana, from Tierra del Fuego, but appears to be less spiny and to differ 

 in the antenme, for Dana describes and draws the flagellum as " 3-jointed, the first joint 

 but little shorter than the preceding, and the second as long as the following." 



Family IV. SCYPHACID^. 



Scyphacince, Dana (iu part), U. S. Explor. Exped., Crust, ii. p. "16 (1853). 



Mandibles without molar tubercle, its place being taken l)y a tuft of long stiff setae or 

 bristles ; inner lobe of first maxilla with two plumose bristles ; maxillipedes with the 

 terminal joints fairly well developed, lamellar, longer than the masticatory lobe; 

 external male organ single. 



The fiimily, for which I propose the definition just given, corresponds in part with 

 Dana's subfamily Scyphacina?, for he rightly oliserved that in the maxilKpedes, Scyphu.r 

 differs considerably from the Oniscidce, though his description that they arc 2-jointed is, 



