232 DR. G. S. BRADY ON 



of the caudal rami ; no inner branch ; distal joint ending in a 

 long falcate claw and bearing a hook-like spine on its external 

 margin ; foot of the left side reaching scarcely as far as the two 

 proximal joints of the right foot, imperfectly three-jointed (the 

 basal joint being imperfectly divided), second and third joints 

 small, tapering to a sharp point. 



This interesting little species was found abundantly in a 

 gathering made by my friend the Rev. Canon Norman, F.R.S., 

 many years ago (1885) and kindly given to me by him. It had 

 remained unnoticed, partly on account of its small size and partly 

 owing to its being mixed up with numberless other Oopepoda and 

 Cladocera, until discovered on a recent re-examination of the 

 collection. My attention was drawn to it chiefly by the very 

 conspicuous dark coloration of the spermatophores, which were 

 attached in unusually great numbei^s to the females — frequently 

 in bunches of three or four together ; the small spherical ovisacs, 

 also very deeply pigmented, formed another mark of recognition. 

 The gathering was from Loch Ness " off Drumnadrochit in the 

 open lake." In several other gatherings made by Dr. Norman 

 during the same tour I have found no trace of this species. 



Order Ostraooda, 



Arunella, gen. no v. 



Animal like Candona except that there are three pairs of 

 ambulatory legs in addition to the flexile fourth pair, which is 

 contained within the shell ; also a pair of setiferous appendages 

 arising from the ventral surface of the body — probably near the 

 base of the first pair of legs. 



Arunella subsalsa, sp. n. (Pis. XXXIX. & XL.) 



Male. — Antennules six-jointed, rather sparingly setiferous 

 (PL XXXIX. fig. 1) ; antennae stout, six-jointed, destitute of 

 natatory setae, no apical claw (fig. 2), but bearing a few stout setae, 

 antepenultimate joint with a pair of rod-like sensory appendages 

 (fig. 3) ; mandibles like those of typical Candonce, mandibular palp 

 four-jointed, with a small 7-setose branchial plate (fig. 4). First 

 pair of maxillae composed of a body with four digitate segments 

 to which is attached an elongated setiferovis branchial plate as in 

 the normal Oyprididfe (fig. 5) ; second pair strongly prehensile, 

 each bearing a small setiferous appendage (PI. XL. figs. 5, 6). 

 First and second pairs of feet four- jointed, rather densely hispid 

 with small adpressed hairs (figs. 1, 2), last joint with two 

 strong apical claws, penu.ltimate joint with a fascicle of about 

 six spine-like setse ; the third pair of feet (fig. 3) destitute of 

 hairs but armed at the extremity with a long falcate claw ; 

 fourth pair flexuous and similar to those of the normal Cyprids 

 (fig. 4). Arising from the ventral side of the abdomen, pro- 

 bably near the bases of the first pair of legs, is an appendage 



