NORTH AMERICAN FRESH-WATER LEECHES. 675 



Nephelis lateralis Verrill. 



Hirudo lateralis Say, Long's Second Expedition, vol. ii, p. 267, 1824 ; Diesing, 



Syst. Helm., vol. i, p. 474. 

 Nephelis lateralis "Verrill, American Journal of Science, vol. ii, p. 451, 1871 ; vol. iii, 



p. 133, 1872. 

 ^ Nephelis vermifwmis Nicholson, Canadian . Journal, 1873, (young.) 



The original specimens, described by Say from the waters between 

 Rainy Lake and Lake Superior, were dull livid with " a few very remote 

 minute black points, and a rufous line along each side ; " the " six ocular 

 points are placed in a regularly curved line." 



Specimens from New Haven, apparently belonging to the same species, 

 were 3 or 4 inches long in extension, and 0.15 to 0.25 of an inch wide ; 

 rather slender and subterete anteriorly, somewhat depressed posteriorly, 

 with the margins rounded. Head obtusely rounded in front, not very 

 distinctly aunulated. Ocelli six, distinct, sometimes with faint colored 

 spots, like indications of another pair on the first segment ; the front 

 pair, on the first segment, is very distinct and much larger than any of 

 the others, well separated, round, and blackish; the two pairs on the 

 sides of the buccal segment are very small and well separated. Acetabu- 

 lum as wide as the body, when extended, with a circular row of blackish 

 submarglnal spots. The three folds of the oesophagus are about as in 

 the following species. The color above is sometimes plain dark brown, 

 and often dull dark orange-brown, with numerous fine longitudinal lines, 

 alternately darker and ligher, and with many small irregular black spots 

 scattered unevenly over the surface, except along the middle of the back ; 

 an obscure reddish line passes along each side near the margin, appar- 

 ently due to an internal vessel showing through the integuments ; lower 

 surface plain, dull orange-brown, somewhat lighter than the back; head 

 light flesh-color. Several other varieties occur. Some are nearly black, 

 with few scattered lighter specks ; others are pale brown, or light slate, 

 specked with small darker brown or blackish spots. 



Whitney ville Lake, and Farmington, Conn., and Peak's Island, Casco 

 Bay, Maine— A. E. Verrill; Bad River and Madeline Island, Lake Supe- 

 rior — J. W. Milner; Clear Lake, Colorado, (plain brown variety) — Hay- 

 den's expedition ; Lake Euron (pale variety) — J. W. Milner. 



Nephelis qtjadristriata Grube. 



Famil. des Annel., pp. 110 and 149; Diesing, Sitzungsberichte der kaiserlichen 

 Akad. der Wissenschaften, math.-uaturwiss. Classe, xxxiii, p. 496, 1859; Ver 

 rill, op. cit., vol. iii, p. 133, 1872. 



Body, in extension, 2 to 4 inch es long, by 0.12 to 0.25 inch broad, slender 

 subterete, tapering to the anterior end ; in contraction broader and some- 

 what depressed posteriorly ; the sides rounded. Po.sterior sucker large, 

 nearly as wide as the body, to which it is broadly attached. Mouth 

 rather large, suborbicular, the upper lip a little expanded, rounded in 

 front, wrinkled within, smooth externally, and not distinctly aunulated 



