GENUS OF TERKESTKIAL ISOPODA. 



441 



or slightly rugose, more especially on tlie anterior segments. Epimera 

 large, each with a faint ridge running backwards and outwards towards its 

 posterior angle. 



Surface o£ pleon smooth ; epimera of third, fourth, and fifth segments 

 largely developed, last segment triangular, nearly twice as broad as long, 

 apex rounded. 



Uropoda with basal joint broad, reaching slightly beyond the end of the 

 last segment^ upper surface raised in middle into a longitudinal keel, lateral 

 margin somewhat expanded ; outer ramus long, lanceolate, fully twice as 

 long as b;ise ; inner ramus only about as long as the base, not in contact 

 with its fellow on the other side. 



Female. — Differs from male in having the body more oval, the long 

 spines represented only by rounded tubercles, the oblique ridges on the 

 epimera rather better marked, and the antennas more slender. 

 Length of male (without uropods) 22 mm., breadth 10 mm. 

 Length of female 20 mm., breadth 9 mm. 

 Colour. Shity grey, with marbled markings of lighter colour. 

 Habitat. Table Bay, Cape Colony, collected on sea-shore with Ligia glahrata 

 by Krauss ; collected at " The Cape " by the ' Novara ' Expedition ; the 

 specimens from the South African Museum submitted to me are labelled : — 

 " Sea-shore at Hout Bay, Cape Peninsula, W. L. Sclater coll., April 1901," 

 and " Sea-shore at Scuilphoek, 2 to 3 miles south of Hermanuspetrusfontein, 

 Caledon District, Cape Colony, R. M. Lightfoot coll., February 1903." 



Of this species I have seen several males, but only one female ; the males 

 are all of about the same size^ and have the pair of long slender spines on 

 each segment of the pereeon well developed ; the spines are considerably 

 longer than those of i>. avmata as figured by Budde-Lund. In the single 

 female the dorsal surface is granular, more so than in the male, and the 

 spines are represented only by small, rounded, light-coloured tubercles 

 projecting only slightly above the general surface. 



The species appears to be considerably larger than D. acinosa, but closely 

 resembles that species in its appendages. 



Deto acinosa, Budde-Lund. (PI. 39. figs. 4-18.) 



Deto acinosa, Budde-Lund, 1885, p. 235. 

 „ „ Stebbing, 1893, p. 431. 



,, Budde-Lund, 1906, p. 85. 



Male. — Oblong-oval, fairly convex. Head with a rather large rounded 

 tubercle on each side near the posterior border and internal to the eyes, rest 

 of surface coarsely granular. Each segment of the person with a large 

 subacute tubercde on each side near the posterior margin, projecting upwards 

 and backwards to a distance equal to half the length of the segment from 



