.SG8 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
Page 7. The genus 4 («) Entosplienus should probably be admitted, 
and its species should be — 
4. E. tradciitatus (Gairdner) Gill. 
It ranges from Monterey to Vancouver’s Island, and Nos. “5” and 
“0” are not distinct from it. 
On page 8, after Ammoccetes ijlumheiis^ add: 
7 (t). A. awreiis Bean. 
Plumbeous above, golden yellow below; under side of head and neck 
silvery. Maxillary tooth single, bicuspid; mandibulary with 7 cusps, 
the outer largest. Head shorter than chest; distance from eye to first 
dorsal thrice base of first dorsal; base of second dorsal twice as long 
as that of first, the fin twice as high; interspace between dorsals § 
length of head; tail (from vent) 4 in total length. Head 10 J (5^ in 
distance to first dorsal). L. 15 inches. Yukon Eiver, Alaska; abun- 
dant. {Bean.) 
{Ammocmes aureus Bean, Proc. U. vS. Nat. Mus. iv, 1881, 159: ’i Petromyzon mannus 
camtschaticus Pallas, Zoogr. Rosso-Asiat. iii, 1811.) 
On page 9, after Ammocoetes niger^ add: 
S (1>). A. appendix (Dekay) Gill. 
Dusky brown, sometimes tinged with bluish; fins pale amber. A 
ring of irreguiarly-shaped corneous processes within the mouth, and a 
large isolated double tooth of the same texture on the inferior portion 
of the mouth. Origin of dorsal in advance of middle of body (behind 
middle in A. niger). Vent near posterior third of body. Anal papilla 
C^bippeudix”) conspicuous in males in spring. Streams of New York 
and Southern New England. {Dekay.) Not lately recognized, but ap- 
parently differing from A. niger in the less posterior dorsal. 
( Petromyzon appendix Dekay, New York Fauna, Fish. 1842, 381: Ainmococtes unieolor 
Dekay, 1. c. 383; larva. Of the remaining species flescribed by Dekay, Ammocoeles 
hicolor Le Sueur, 1. c. 383, seems to be the larva of Petromyzon marlniis, and P. lamot- 
teni Le Sueur MSS. 1. c. 382, is jirobably Petromyzon argenteus.) 
Page 10. Petromyzon casfaneus has been lately received from Loui- 
siana. It is considered a valid species by Dr. Bean, as is also 9 (6), 
P. hirnao (Grd.) Bean. Both these species have the maxillary tooth 
tricuspid, not bicuspid as in P. argenteus. 
Page 11. The mandibulary teeth in Petromyzon marinus are usually 
7 in number. The plates of the anterior lingual pair are confluent, and 
not their serrations as stated in the text. 
