18 G. 0. Sårs. 



dilated didactyl hand, dactyli slender, unequal, each having 

 at the base an obtuse projection. Branchial legs with a 

 single, smooth basal plate, terminal lobe of endopodite broad, 

 sub-angular, and, in the middle pairs, armed at the inner 

 angle with 4 curved spines. Body highly pellucid, with a 

 very slight greenish or yellowish tinge. Length of fully 

 grown female 20 mm., of male 21 mm. 



Remarks. — At first I thought that this form might be 

 the JBranchipus eaffer of Loven, w T hich likewise is from 

 South Africa, and which undoubtedly belongs to the genus 

 Streptoceplialus : but the very short diagnosis given by 

 Loven does not suffice for a reliable specific determination, 

 and indeed, the notes subsequently given by Brauer 1 ) on an 

 examination of some authentic specimens of this form 

 preserved in the Zoological Museum of Berlin, show that 

 Lovenes species is different from the one here described. 

 It would seem to be more nearly allied to the Branchipus 

 rubricaudatus of Klunzinger 2 ) from the northern part of 

 Africa, though differing also from this species in several 

 points. 



Description. — The length of fully grown female speci- 

 mens, measured from the front to the tip of the caudal 

 rami, amounts to about 20 mm., that of the male to 21 mm. 



In both sexes the body (see figs. 1 and 2) is very 

 slender and elongated, exhibiting, in the living state of the 

 animal, a slight sigmoid curve. The 2 chief divisions of 

 the body are well defined, the posterior one being consider- 

 ably longer than the anterior. The latter, as usual, is 

 composed of the head and trunk, the latter of the genital 

 region, and the tail. 



i) Sitzungsber. d. K. Akad. d. Wiss. in Wien. 1877. 

 2) Zeitschrift t', wiss. Zool., XVII, 1866. 



