ART. 14 



NORTH AMEEICAN COPEPODS MAESH 



21 



the right fifth foot of the male has, as shown in Figure 11, in 

 addition to the small tubercle mentioned by Pearse, a hyaline 

 appendage near the inner distal angle and at the base of this 

 appendage a small recurved hook. The left endopodite of the 

 male fifth foot was one-segmented instead of two-segmented as in 

 tlie Nantucket specimens. 



DIAPTOMUS STAGNALIS Forbes. 1882 



Diaptomus stagnalis was described by Forbes in 1882. His de- 

 scription was not complete but was sufficient to clearly identify the 

 species. Herrick, in 1882, proposed a provisional name of giganteus 

 for a form for which he gave no description, but his figures show that 

 it is identical with Forbes's stagnalis; in 1884 he acknowledged that 



Figure 12. 



-Distribution of Diaptomus stagnalis Forbes (0)> D- signicauda Lilueborg (#), 

 and d. washingtonensis marsh (+) 



Forbes's name had the right of priority and gave a somewhat care- 

 ful description with figures of the wing of the last cephalo- 

 thoracic segment and of the fifth foot of the male. In 1895 Herrick 

 and Turner again described the species with a number of figures. 

 The most complete description is that by Schacht in 1897, but he gave 

 but one figure, the terminal segments of the right antenna of the 

 male. Marsh in 1907 reproduced the description of Schacht, using 

 figures from Forbes, and Herrick and Turner. More recently the spe- 

 cies has been found in Virginia, near Washington, and from this ma- 

 terial figures are given of the terminal segments of the right antenna 

 of the male. Figure 13; the fifth feet of both sexes. Figures 14 and 15; 



