706 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [6] 



First maxilliped stout and short, about four times as loug as wide. 

 Three distiuct joiuts or segments, with a number of small iudefiuite 

 articles compacted at the tip, this last bearing four long, stout, curved, 

 parallel bi-peunate setad, and two smaller ones not in the same series. 

 Proximal joint the longest, the second shortest, about half as long as 

 the third, the latter two thirds the first. The second joint bears two 

 plumose setre and the third joint three, the two basal of these upon a 

 separate lobe. The latter joint bears also a fourth short stout seta in- 

 serted near the lower one. 



The second maxilliped has three lobes on the anterior margin of the 

 basal joint, each bearing two long, stout, coarsely plumose bristles, with 

 their barbs extending forwards. The second joint bears one very loug 

 and one short plumose bristle at the anterior inferior angle. The re- 

 maining joints, together about as long as the second joint, bear five long 

 and two shorter plumose bristles. 



The first four pairs of legs (PI. I, fig. 5) are similar, the outer ramus 

 three-jointed, and the inner one-jointed. The last joint of the outer 

 ramus of the first pair is about as long as the two preceding, and the 

 tip of the inner ramus reaches about to the middle of the second joint 

 of the outer. The outer ramus of the fourth pair of legs (PI. I, fig. 5) 

 has two teeth at the outer tip of each of the two basal joints. The ter- 

 minal joint of this ramus is armed as follows: A short, simple spine at 

 middle of outer margin, and another at the distal outer angle ; a single 

 large and long terminal seta, strongly and sharply toothed externally 

 and plumose within ; and four long plumose setse attached to the inner 

 margin. The inner ramus bears two terminal and three internal plumose 

 setse. The left leg of the fifth pair in the male (PI, I, fig. 3), viewed 

 from behind, has the basal joint very large, broader than long, with the 

 inner inferior angle produced downwards as a long, stout, curved pro- 

 cess or arm, as long as the two remaining joints. The second joint is 

 trapezoidal, shortest within. The third joint is about half as wide at 

 base as the first, is straight without, with a sharp small tooth at its 

 distal third, and bifid at tip. On the inner margin this joint is at first 

 dilated a little and then deeply excavated to the narrow tip, to receive 

 the lower end of the left leg, the lower two thirds of this margin form- 

 ing the segment of a circle. 



The marked distinction of this genus points to a separation from the 

 stock common to it and Heterocope earlier than that of our other char- 

 acteristic species of Oalanidse, and a much earlier appearance in its 

 present habitat than that, for example, of the following species, which, 

 like Epischura, is without egg sac. 



Limnocalanus macrurus Sars, var. auctus, new var. 

 Amer. Nat., xvi (1882) p. C48. 

 This large calanid, very abundant at times in the southern end of 

 Lake Michigan, and occurring also in Geneva Lake, Wis., I found 

 twice in Lake Superior, at Marquette, Our specimens differ constantly 



