668 Brady and Norman — Monograph of the Marine and Freshwater Ostracoda 



round cells. Seen from above the form is widely ovate, the greatest breadth, 

 which is central, being equal to more than half the length ; the margins are 

 boldly and evenly arched ; in front the rostrate process is seen slightly projected, 

 and furnished at the sides with four or five flattened nodulous processes ; the 

 posterior extremity is mucronate. Length, 2 mm.; height, l"3mm. 



The antennules (fig. 3) have the proportionate length of the joints as is usual. 

 Antennae (fig. 4), with basal joint subquadrate, its length and breadth subequal, 

 remarkably small and much shorter than the first joint of the swimming branch ; 

 first joint of the swimming branch slender, slightly arcuate and longer than 

 the rest of the limb ; setae ten, short, ringed, but not plumose ; a spine-formed 

 seta on the basal joint of the antenna close by the origin of the appendicular 

 branch, which consists of one short joint, and is naked and broad at the end, to 

 one corner of which is attached a long terminal seta. 



Mandible (fig. 5), with "masticating" process of basal joint long, and cleft 

 only for a short distance at its extremity; first joint of palp without cleft spines, 

 but furnished on the inner margin with six short, stout, ciliated setse, and a 

 longer seta on the central line between the more distant pairs of setae just 

 described, the upper margin having a seta towards the extremity, followed by a pair 

 of setae and a laminar appendage, which is about half the length of the follow- 

 ing joint, and ends in two setae ; second joint with a pair of ringed setae on the 

 lower margin, preceded by a minute seta, all of these ciliated only on their 

 central portion ; third joint only slightly narrowing from the base to the extremity, 

 bearing five ringed and ciliated setae on the central portion of the upper margin, 

 on the lower margin a single seta, and, then, near the extremity a pair of spines ; 

 last joint minute, with two short setse and two long, gently curved ungues, 

 which are crenated at the end. 



The second maxillae have the lobes very small and pressed close together, 

 with very few setae, apparently not more than four to any one lobe ; tooth 

 enormously developed (fig. 6), occupying by far the larger part of tlie end of the 

 member, sub-quadrate in form, broadly truncate at the end, and smooth edged ; no 

 setae beyond the tooth, except those belonging to the small palp, whicli consists 

 as usual of three divisions, the first furnished with two, the second with four (?), 

 the third with one (?) seta ; vibratory lamina large, edged with about thirty- six 

 setse. Penultimate limb consisting, as usual, of four lobes, the first with three, 

 the second with six, the third with five, the fourth with five setae. 



Vermiform limb with twelve spines, six of which are at the extremity ; the 

 spines are furnished with three or four pairs of spinules (fig. 7). Caudal laminae 

 (fig. 8), rather narrow, bearing nine not crowded ungues, all strongly spined on 

 the edge ; in the smaller ungues the spines are only seen near the base, but in 

 the larger throughout the greater part of their length. 



