NORTH AMERICAN FRESH-WATER LEECHES. 675 



NePHELIS LATERALIS Vemll. 



Hirudo lateralis Say, Long's Secoad ExpeditioD, vol. ii, p. 267, 1824 ; Diesiug, 



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

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



p. 133, 1872. 

 '? XejjheUs vermiformis Nicholson, Canadian .lournal, 1873, (young.) 



The original specimeas, described by Say from the waters between 

 Eainy Lake and Lalce 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 annulated. Ocelli six, distinct, sometimes with faint colored 

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

 I)air, 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 

 submarginal 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 sjiots. 



Whitneyville Lake, and Farmington, Conn., and Peak's Island, Casco 

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

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

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



Nephelis quadristriata 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 inches 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. Posterior 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 annulated 



