TKRRESTRIAL ISOPODA OF NATAL. 475 



inwards, basal joint wider proximally than distally, endopodite 

 slightly curved and usually shorter than tlie exopodite and 

 with much longer terminal style ; both one and a-half times 

 longer than the basal joint, setaceous, Telson (fig. 18) faii-ly 

 long, anterior mai'gin prominent and rounded laterally, 

 posterior margin spinous. 



Length 16-17 mm. 



Colour (in alcohol) silver-grey, with darker gi-eyish 

 markings. 



Habitat.— Uinhlali, May, 1916. Winkle Spruit Beach, 

 vSouth Coast, Dec. 1916 (C. Akerman). 



Type. — In the Natal Museum. 



2. Ligia dilatata Brandt. PI. XXVIII, figs. 10-27. 



Ligia dilatuta Brandt, Bull. Soc. Imp. Nat. Moscou, 1833, vol. vi. 



? Ligia glabrata Brandt, ibid., p. 172. 



Lygia dilatata Krauss, Siidafrik. Crust., 1843, p. 62. 



Ligia dilatata White, JAst Crust. Brit. Mus., 1847, p. 98; Budde- 



Lund, Crust. Isop. Terr., 1885, p. 262. 

 ? Ligia gracilipes Bvdde-Lund, ibid., p. 270. 

 Ligia dilatata Stebbing. Ann. South Afr. Mus., 1910, vi, p. 437. 



Body (fig. 19) oval or oblong oval, slightly convex dorsally 

 and finely granulated ; metasome not abruptly conti-acted. 

 Cephalon (fig. 20) semi-oval from above, with posterior 

 transverse groove; epistome with three transverse ridges. 

 Eyes large and convex. Antennulge (fig. 21) small, o-jointed, 

 terminal joint rudimentary. Antennae (fig. 22) robust and 

 elong-ated; fiagellum with 15 joints. First maxilla (fig. 23), 

 outer lobe with five stout, pointed spines and five inner ones 

 varyingly denticulate ; inner lobe with three setose terminal 

 spines, the first of which has a prominent knob. Mesosome 

 with the pleural plates greatly expanded ; the 1st partly 

 flanks the cephalon, 2nd to 4th truncate terminally, 5th 

 to 7th with their posterior angles directed baclcAvard. 

 Pleural plates of metasome also expanded. First meso- 

 somatic appendage (fig. 24) with all the joints deeply 



