158 Illinois State Laboratory of Natwral History. 



which M. Eiballier des Isles, French consul at Newfound- 

 land, was kind enough to make according to our directions 

 at Kinney's Pond near St. John's. This Calanid [centropa- 

 gid] was found in great numbers by M. Ch. Eabot in 1888 

 in the following localities in Greenland : Lake Egedesminde 

 (Bay of Disko) ; Godhavn ; near the glacier of Jakobshavn, 

 and in the Tasersuak of Julianehaab."* 



"Marsh finds this form in Green Lake [Wisconsin], and 

 in the Great Lakes ; it may, therefore, be expected in Lake 

 Superior in Minnesota. "t 



Marsh ('95) places sicilis var. imperfectus as a synonym 

 under minutus, but does it, as he says, "with considerable 

 hesitation." In looking over the drawings in the possession 

 of the State Laboratory I found some which had been repro- 

 duced but not published, and from these it was evident at a 

 glance that the var. imperfectus was not minutus but ashlandi, 

 although this was not evident from the description. A single 

 specimen of minutus was found among the collections from 

 Yellowstone Park, but it was so badly mutilated that no 

 drawings could be made from it. 



Specimens from Greenland, kindly sent me by Professor 

 Lilljeborg, conform to his description but are somewhat 

 smaller than those figured by Marsh. 



Diaptomus tryborni Lilljeborg. (PL XXXI., Fig. 1-5.) 



lHaptomus trybomi, de Guerne et Richard, 'S9b, p. 58, PL I., Fig. 35; 



PL II., Fig. 6; PL III., Fig. 14; PL IV., Fig. 28. 

 Diaptomus trybomi, Herrick and Turner, '95, p. 57, PL VIII., Fig. 17; 



PI. IX., Fig. 4: PL X., Fig. 13. 



" Of medium size. Cephalothorax widest about the middle. 

 Last two segments distinctly separated, and the last, seen 

 from above (PL XXXI., Fig. 3), slightly produced laterally, 

 provided with two spines (one of them minute) on each 

 side. Besides this the right part of this segment (PL XXXI., 

 Fig. 2) bears a large dorsal appendage, triangular in form, 

 with mucronate apex, and extending toward the right. The 



*de Guerne et Richard, 89b. 



t Herrick. From Uerriek and Turner, '95. 



