3. PETROMYZONTID^ PETROMYZON. 1 1 
the second, which is continuous with the caudal. Species two — marine, 
ascending rivers, {-irpa^ stone; to suck.) 
11. P. niarintis L. — Great Sea Lamprey. 
Head moderate, but little longer than the “chest”; buccal disk large, 
with numerous conical teeth, arranged in obli(pie series, those nearest 
the cesopiiagns largest and partly bicuspid ; two pairs of lunate, pecti- 
nate lingual teeth, one in front of the other, the serrations on the an- 
terior pair usually confluent ; fins moderate, the dorsals well separated ; 
the second dorsal with a depression on the tail; lips moderately fringed. 
Color olive-brown, mottled with blacJdsh conjiuent patches ; dull brownish 
below. Size much larger than any of the other species. L. 24 to 36. 
Atlantic coasts of Europe and North xVmerica, chiefly northward, ascend- 
ing streams in the spring to deposit its spawn. 
{Petromyzon rnarinus L. Syst. Nat. ; Giinther, viii, 501 ; Jordan, 348. — Petromyzon 
americanus Le Sueur, Trans. Am. Philos. Soc. i, 3.83. — Petromyzon americanus Storer, 
Fish Mass. 251.) 
12. P. MB^yricaiJS Le Sueur. — Lamper-eel. 
Head very large, longer than the “chest”, GJ in length; depth about 
13; body little compressed ; dorsal fins rather low, distinctly separated; 
ej^es and mouth very large; mandibulary plate with 7 to 0 teeth; the 
rest of the buccal disk covered with rather large teeih disposed in ob- 
lique cross-rows, five or more in each row, some of the innermost bicus- 
pid ; anterior as well as posterior lingual teeth iiectinate ; lips fringed. 
Coloration nearly plain; bluish black above, pale below, usually a pale 
spot between the eyes on the top of the head. L. 12. A rather small 
species found along the Atlantic coasts of our Northern States, and 
ascending streams in the spring to spawn, some individuals remaining 
permanently in fresh water. Abundant in Cayuga Lake, N. Y., from 
which locality the specimens were taken on which the above descrij)tion 
was based. 
{Petromyzon nigricans Le Sueur, Trans. Amer. Phil. Soc. new series, i, 385; Storer, 
Fish Ma.ss. 253. — Ammoccetes Jinviatilis Jordan, 349.) 
This species is very different from the European Lampetra fliiviatilis. 
It is possibly only a variety of Petromyzon marinus. Numerous other 
Lampreys have been described from our waters, but we find them un- 
recognizable. 
