1895- No, 8. SOrTlI-AFRlCAX ÉNTO.MOSTRACÂ. I9 



that of the heaci, a quite even curve, inferior edges somewhat arcuate, 

 posterior edges obliquely descending, and slightly bulging in the middle, 

 joining the inferior edges by a strong curve. Head remarkably erect, 

 rostrum obtusely ()ointed. Surface of shell distinctly striated longitudinally,- 

 inferior edges of valves fringed with long and delicate bristles. Ocellus 

 scarcelly larger than the eye. Tail large and expanded, with the poste- 

 rior edge evenh- curved throughout, without any notch at the tip, lateral 

 denticles ver\- slender, s_ iniform, and, as in the other species, arranged 

 on each side in a double row, terminal claws quite smooth. Adult male 

 much smaller than the female, with the carapace less broad, and the head 

 more erect. Antennulæ thicker, and having the olfactory papillae more 

 fully developed. First pair of legs each with an exceedingly strong, an- 

 teriorly curving claw. Tail much narrower than in female, with the 

 lateral denticles fewer in number and more crowded, terminal claws shorter; 

 efferent ducts of the testes produced to 2 cylindrical appendages project- 

 ing from the tip of the tail, in front of the terminal claws. Colour in 

 both sexes more or less vivid blood-red. Length of adult female 0,90 mm., 

 of male 0,50 mm. 



Remarks. This form is, I believe, that originally described by Fischer 

 as Lynceus acanthocercoides. But as that species does not occur in Nor- 

 way, I am, at present, not enabled b}' direct comparison, to ascertain 

 the identity of both. As far as I can judge from earlier descriptions, 

 there seems, however, to be nothing to forbid such an identification. From 

 the Australian species, described by the author as L. australis, it is at 

 once distinguished by the very distinct sculpturing of the shell, and, more- 

 over by the smaller size of the ocellus, as well as by the form of the tail. 

 In the latter respect it more resembles the L. quadrangularis Leydig, a 

 species also iound in Norway, but in that form the terminal claws have 

 each a distinct denticle at the base, which is wanting in the present species, 

 while the sculpture of the shell is also different. 



Description of the female. 



Adult specimens attain a length of nearly i mm., and this form 

 accordingly grows to a considerably larger size than the Australian 

 species. 



The carapace is rather compressed, and, seen laterally (fig. i), very 

 broad, of an irregularly quadrangular shape, being gradually expanded 

 towards the posterior extremity, which is rather obliquely truncated. The 

 dorsal margin is but slightly arcuate, and quite continuous with that of the 

 head, both forming together a perfectly even curve. The inferior edges 



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