226 Annals of the South African Museum. 
Gren. PARORCHESTIA Stebbing. 
1899. Parorchestia Stebbing, Tr. Linn. Soc. Lond. ser. 2, vol. 7, pt. 8, 
p. 402. 
1906. 2 id. Das Tierreich, 21, pp. 557, 735. 
1909. . Chilton, Subant. Is. N.Z. p. 636. 
PARORCHESTIA TENUIS (Dana). 
1853 and 55. Orcheslia tenuis Dana, U.S. Expl. Exp. vol. 138, 2, p. 872, 
Olga) sale 
1862. x » Bate, Cat. Amphip. Brit. Mus. p. 29, 
pl. 4, fig. 10. 
1881. ,  sylvicola Thomson, Tr. N.Z. Inst. vol. 138, p. 212, 
pl. 7, fig. 4 (non Dana). 
1884. Allorchestes recens id. ibid. vol. 16, p. 235, pl. 18, figs. 2-5. 
1893. Orchestia gammarellus (part) Della Valle, F. ue Fl, Neapel, 
vol. 20, p. 501. 
1899. Parorchestia tenuis Stebbing, Tr. Linn. Soc. Lond. lc. p. 402. 
1906. i 7 id. esp. oad. 
1909. “i , Chilton, Subant. Isl. N.Z. p. 642. 
Body fairly compressed. Eyes rather large, equal to half the upper 
margin of head, circular, almost meeting on the top of the head. Side- 
plate 1 smaller than and partly concealed by 2, side-plates 2-4 of 
same depthas their segments, with a posterior point above which hind 
margin is excavate, inferior margins of 1-4 minutely spinulose, 5 nearly 
but not quite as deep as 4. Postero-inferior angle of Ist pleon 
segment quadrate with a very small point, of 2nd and 3rd quadrate, 
somewhat produced in an acute point, hind margin concave above the 
point, perfectly smooth. 
Telson rather short, triangular, avery faint apical notch, the only 
setae present are 3 on each apex set just within the margin. 
First antenna not quite reaching apex of peduncle of 2nd antenna, 
Ist, 2nd and 8rd joints subequal, flagellum equal to peduncle, ¢ 7-, 
Q 4-jointed. 
Second antenna 4 length of body, ultimate joint longer than penulti- 
mate, flagellum equal to peduncle, ¢ 14-, 2 7-jointed. 
First gnathopod @ exactly resembling Thomson’s figure of his 
Allorchestes recens (= Parorchestia tenuis (Dana) ). 
Second gnathopod ¢ also in close agreement with that of P. tenwis. 
The defining angle is a little more prominent than in Thomson’s 
figure, but is not at all tooth-like, and carries one fairly stout spine. 
First and second gnathopods 2 also resembling Thomson’s figures 
