76 



16. Candona caudata, Kaufmann. 



(PI. XXXV). 

 Candona caudata, Kaufmann, Cypriden und Darwinuliden der Schweiz, p. 365, PI. 24, 



figs. 1620, PI. 26, figs. 17-23. 



Syn: Candona acuminata, Brady & Norm, (not Fischer). 

 , elongata, G. W. Miiller. 



Specific Characters. Female. Shell rather elongate, seen laterally, narrow 

 reniform in shape, with the greatest height not nearly attaining half the length, 

 dorsal margin gently arched, without forming any distinct angular bend either 

 in front or behind, ventral margin distinctly sinuated, anterior extremity evenly 

 rounded, posterior obliquely produced and exerted to a rather prominent 

 peculiarly deflexed corner more fully developed on the left valve, this corner 

 being however quite obsolete in immature specimens; seen dorsally, narrow 

 elliptical in outline, with the greatest width only slightly exceeding Va of the 

 length, both extremities obtusely pointed. Surface of valves smooth and po- 

 lished, though exhibiting a number of small scattered pittings and a few short 

 and delicate hairs at each extremity. Both pairs of antennae unusually robust, 

 the anterior ones with the terminal part scarcely longer than the basal one, and 

 having the setae very coarse, almost spiniform. Anterior legs likewise com- 

 paratively more strongly built than in most other species, with the apical claw 

 very coarse. Posterior legs with the penultimate joint distinctly subdivided. 

 Caudal rami comparatively large, gradually attenuated, and only slightly curved, 

 distal claw not attaining half the length of the ramus, dorsal seta of moderate 

 size. Posterior end of body produced, immediately above the insertion of the 

 caudal rami, to a slightly denticulated deflexed point, and carrying farther above 

 a short seta. Genital lobes forming behind a rather prominent conical lappet. 



Colour white, with a pearly lustre especially very conspicuous in young 

 specimens. 



Length of adult female amounting to 1.20 mm. 



Male unknown. 



Remarks. This form was formerly identified by Brady and also by myself 

 with C. acuminata (Fischer), which however, as shown by G. W. Miiller, is a 

 different species. It has been recorded by the latter author under the name 

 of C. elongata Herrick; but the description and figures given by Herrick are 

 much too imperfect as to allow of a certain identification, and I therefore agree 

 with Dr. Aim in retaining for this species the name proposed by Kaufmann. 

 who has given a good description and easily recognisable figures of it, the 

 specific name alluding to the peculiarly exerted posterior corner of the shell 





