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



ringed setae on the upper margin, one in the middle, the others near the extremity, 

 and to the extremity itself is attached a very small laminar appendage ending 

 in two small setse ; below, the proximal corner is produced backwards into a 

 triangular lobe tipped with four small plumed setae, beyond which are four organs 

 of remarkable character ; with a low power they look like ordinary spines, but 

 when highly magnified it is seen that they consist of an attenuated basal portion 

 and an expanded spear-shaped extremity (PI. l., fig. 6 «) ; the distal half of the 

 basal portion, moreover, is annulated and also ciliated, and the spear-shaped 

 extremity under a very high power is seen to be tridentate; second joint of palp 

 with a fascicle of three long, ringed, and ciliated setae on the middle of the inner 

 margin ; outer margin of the third joint covered with setae nine in number, the 

 first slender, the next two stouter, after which slender and stouter setae are 

 arranged alternately, lower margin with three setae at the extremity; last joint 

 with a strong unguis above, below which are five setae. 



None of the three following organs are furnished in any part with either 

 ungues or spines, but are invested everywhere with plumose setae. The first 

 maxillae (PL li., figs. 14, 15) are of remarkable form; they consist of an 

 un jointed, gradually acuminated main member, which is bent back upon itself, so 

 as to form a bow ; the outer margin is smooth, the inner densely covered almost 

 throughout with long plumose setae; just before the end of the reflexed extremity 

 the setae cease, but the extremity itself terminates in two simple setae ; within the 

 margin at the base is a group of setae of larger size : on the outer side of this 

 main member is a second in the form of a flattened, triangular, naked process, 

 which is not half the length of the main member. 



The second maxillae (PL li., fig. 16) consist of a single strap-shaped member, 

 narrowly rounded at the extremit}^, fringed on the inner side with plumose setae, 

 and twisted half round in the middle of its length in the female, but not twisted in 

 the male ; behind this is a very large semiovate, vibratory lamina, surrounded 

 with long plumose setee. 



The penultimate limb (fig. 17) consists solely of a subtriangular or shoe-shaped 

 plate, margined with short plumose setae. 



The vermiform limb (fig. 18) has about twelve spines of the usual character, 

 six of which are at the extremity; these spines (fig. 19) have four pairs of spiuules 

 towards the extremity. 



The caudal laminae (fig. 22) have ten ungues, the upper five small, the following 

 five larger, and successively increasing in size to the last. 



The hinder portion of the body is furnished dorsally with seven pairs of 

 overlapping, elongated membranaceous respiratory lamellae (PL L., fig. 1). 



In the male the antennules (PL l., fig. 2) are six-jointed, second joint longer 

 than the first, with one large, plumose, backward-curving seta on the middle 



