1134 



CRUSTACEA. 



branch, and the posterior setae of the first joint of the same branch, 

 characterizing the Calani. The right male antenna has four joints 

 following the geniculating articulation, of which the first corresponds 

 to two in the left antenna. Preceding this geniculating articulation 

 there is a long joint, which appears to be subdivided at middle, and 

 evidently corresponds also to two joints. The next two joints towards 

 the base bear the dentations described ; they are nearly cylindrical 

 and the thickest of the antenna. The next preceding is a little 

 smaller, and beyond this there are several joints much shorter; the 

 second is oblong, and has a small prominence on the anterior margin. 

 The inferior eyes are quite small, the pigment deep carmine, nearly 

 black. The posterior feet are very dissimilar. One branch of the 

 right terminates in a large hand, and the basal joint of this branch is 

 small and has a prolonged spiniform apex. The next joint is stout 

 and short, but is laterally prolonged at right angles to the line of the 

 leg, and then this long process is again bent at right angles ; there is 

 a spine on the inner side of this process. The next joint is articu- 

 lated with the basal portion of the preceding, and is elongated into a 

 spine, which is nearly straight or but slightly curved. It has a small 

 spine at base on the inner side. The other branch of this leg is 

 simply three-jointed and furnished with setae. The other leg of the 

 pair resembles the natatories ; the branches are three-jointed, and the 

 inner bears a few setae. Abdomen four-jointed. 



Plate 19, ^g. 8 a, represents a female probably of the above species; 

 it was taken at the same place and time. The head, however, is more 

 rounded in front; the posterior angles are divaricate and have an 

 angle within in addition to the acute extremity; the abdomen is 

 three-jointed, the first two quite large, the last very short, the first 

 bearing a curved spinous process on the right side ; the oblong stylets 

 are divaricate, and the setae spreading. The antennae have the same 

 position, but are more slender ; the setae are similar in relative length, 

 except that the posterior apical are shorter, and the anterior apical a 

 little longer. The last five joints are subequal; the setae towards 

 base are one to two diameters of the joints in length. 



Plate 79, figs. 9 a, b, c, d, e, /, g, represent parts of a specimen sup- 

 posed to be the same species with the brachiata, and to which our 

 description above given applies. The right male antenna is similar, 



