1 895- No. 8. SOUTH-AFRICAN ENTOMOSTRACA. 



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daws, the latter rather elongated and nearly straight, with a remarkably 

 strong secondary denticle at the base, anteanal denticles well marked, 

 about 22 on each side, and more crowded at the tip, postanal angle 

 inconspicuous. Male not ^'er}' different from the female in its general ap- 

 pearance, though exhibiting the usual sexual characters. Colour in female 

 dark yellowish or olivaceous, in male considerably paler. Length of adult 

 female 1,05 mm., of male 0,70 mm. 



Remarks. This is a very distinct species, which I have much pleasure 

 in dedicating to my friend and colleague, Prof. R. Collett, to whom I am 

 indebted for the material that }-ieldcd this, and the other species here 

 described. Its nearest ally is Alouopsis latissima Kurz, a species which 

 difüers considerably from the type of the genus, Alonopsis eiongata G. O. 

 Sars, though perhaps it is more strictl}^ related to Alonopsis than to 

 Alonella, with which latter genus I formerly have associated it. The 

 present new species would seem to be somewhat intermediate between 

 the two, though easily distinguishable from any of them by several 

 well-marked characters, among others by the want of any perceptible 

 striation of the shell. 



Description of the female. 



The length of the largest specimens somewhat exceeds i mm., and 

 this form accordingly grows to a considerabh' larger size than A. latissima. 



The body is very much compressed, its greatest width not nearly 

 attaining half the height (comp. fig. 5 and 6). 



The carapace is ,dorsally, confluent with the head, and exhibits, in a 

 lateral view of the animal (fig. 5), a rather broad oval quadrangular form, 

 with the greatest breadth in front of the middle, and the posterior extre- 

 mity nearly transversely truncated, llie dorsal margin is boldly curved, 

 and continuous with that of the head, joining the posterior edges at an 

 obtuse angle. The inferior edges of the valves appear somewhat irrcgu- 

 larh- flexuous in the middle, and join both the anterior and posterior edges 

 by a strong curve. The posterior edges are very slightly oblique, with 

 the lower corner more projecting and rounded off. Seen from abo^'e or 

 beneath (fig. 6), the carapace appears very narrow and gradual!}- tapering 

 posteriorly. 



The head is somewhat more erect than in A. latissima, and quite 

 immobile. It terminates in a rather short, and somewhat obtuse rostrum* 

 The fornix is rather prominent, from which cause the head appears, in a 

 dorsal or ventral view of the animal (fig. 6), almost as broad as the 

 carapace. 



