126 A. E. Verrill—North American Fresh-water Leeches, 
Art. XIX.—Brief Contributions to Zoilogy from the Museum of 
Yale College. No. XVUL—Descriptions of North American 
fresh-water Leeches; by A. EK. VERRILL. 
Cystobranchus vividus, sp. nov. Figure 1. 
ew 
er aad 
- 
‘12 of an inch. Head excen- 6 EE Be ee ee 
trically pedicellate upon a slen- ipa, © Samant 
der neck, small, disk-like, sie 
rounded in front, or somewhat 
heart-shaped with the rounded point forward. Ocelli four, 
small, brownish, placed near the attachment of the neck, om 
each side, those in the anterior pair farther apart. Acetabulum 
large, well-rounded, as wide as the body, disk-shaped, and 
attached nearly centrally. Male organ, when protruded, elon 
gated, conical, acute, placed just behind the fourth pair of large 
lateral white spots. 
Color of back dusky brown or purplish brown, finely specked 
with stellate points of darker brown, and with three irregular 
rows of conspicuous, small, round, opaque white spots along 
the upper surface of the back. Sides with a row of about 16, 
larger and more conspicuous, semicircular, white spots ie 
the margin, each consisting of a cluster of 3 to 9 small rou 
spots, enclosing a more transparent area in which a diaphanous 
pulsating vesicle or enlarged vessel may be seen to protrude at 
each dilation. Lower surface of body light grayish, specked with 
darker and often with obscure transverse bands of whitish; 
acetabulum similar in color to the body, with small reo 
white spots, the margin more or less radiated with lighter am 
darker. Upper surface of head similar to the back, the st 
and front lighter. ; 
West River, near New Haven, on Fundulus pisculentus 
November and December, 1871,—F. S. Smith; Savin Rock, — 
in salt water, among eel-grass,—Prof. J. E. Todd. 
This very active species lives in both fresh and salt wate? 
The transparent lateral vesicles referred to are probabil 
organs of respiration, analogous to the much more highly dev 
oped branchial appendages of Branchiobdella. 
Ichthyobdella Funduli, sp. nov. a 
Body smooth, distinctly annulated, subterete, thickest ©” 
about the posterior third, tapering considerably toward h: 
head, and slightly posteriorly. Length about ‘75 of an mer 
