Additional Notes on South African Phyllopoda. 15 



Apiis trachyaspis,!) G. O. Sars, n. sp. 



(PI. II, figs. 1-2). 



Specific Character. — .9 Body less slender than in 

 the 2 preceding species, with the exposed part scarcely 

 exceeding the median length of the carapace. The latter 

 comparatively of large size, moderately vaulted, and regularly 

 oval in outline, with the greatest width not attaining the 

 median length, terminal lobes not appressed, and obtusely 

 acuminate at the tip; posterior sinus semilunar, with the 

 marginal denticles very distinct, and continued for a short 

 distance also on the lateral edges of the carapace. Eyes,. 

 post-ocular tubercle, cervical sulcus and dorsal keel about 

 as in the 2 preceding species. Shell-glands rather con- 

 spicuous, though scarcely causing any external bulgings. 

 Surface of carapace conspicuously scabrous, being covered 

 with numerous small brownish prickles somewhat irregularly 

 arranged. Exposed part of body comparatively short and 

 thick comprising about 24 segments, of which the 10 posterior 

 ones are caudal: all the segments very coarsely denticulate. 

 Caudal filaments very fully developed, almost equalling in 

 length the whole body. Length (not including the caudal 

 filaments) reaching 42 mm. 



Remarks. — This species is only founded upon a solitary 

 female specimen, which I at first regarded as a very large 

 form of A. numidicus. On a closer examination, however, 

 I have found that in reality the specimen exhibits some 

 apparently essential diiFerences, which seem to forbid its com- 

 bination with that species. Among these differences may be 



^) Derived from Tpa-/uç: scabrous and ac-i;: shield. 



