ADDENDA ET CORRIGENDA. 
Page 3 (57). Bra-iicliiostoma. laiiceolatum. 
To the syuoiiymy of species No. 1, add: 
{“Umax lanceoJatiis Pallas, Spicilegia Zool. x, 19, about 1770.”) 
Uutil the Lancelets are more fully compared, neither our Atlantic 
nor our Pacific coast form can be distinguished from the European 
species. 
Page 5. Instead of Bdellostoma read: 
3. Polistoti'cma Gill. 
The generic name Heptatrema Dum6ril (Cuvier, Regne xVnim.) has 
priority over Bdellostoma Muller. Species 3 may be named — 
3. P. stoilti (Lockington) J. & G. 
The identity of this species, thus far known only from the coast of 
California from Santa Barbara northward, with the Chilian II. domheyi 
is doubtful. The description, on page 57, is taken from California speci- 
mens. The genus Polistotrema Gill (Proc. U. S. Nat. Mus. 1880, 30) is 
distinguished by the presence of 11 to 14 gill-openings instead of G or 7, 
the base of the tongue being between the seventh and eighth (not an- 
terior) pair of branchiae. 
Page 7. A better generic arrangement of our Lampreys than that 
given in the text would be as follows (omitting the character of the 
division of the dorsal fin, which is subject to much individual varia- 
tion): 
a. Maxillary tooth single, crescent-shaped, with a cusp at each end. 
b. Lingual teeth pectinate 4. Entosphenus* Gill. 
bb. Lingual teeth obscurely tricuspidate 5. AmmoccetesI Dum6ril. 
aa. Maxillary tooth of 2 or 3 pointed cusps close together; lingual teeth pectinate. 
G. PetromyzonI L. 
* Species E. tridentatus (Gairdn.) Gill. 
t Including Lampetra Gray. Species A. plumbeus (Ayres) Bean: A. aureus Bean: A. 
nif/er (Raf.) Jor. : A appendix (Dek.) J. & G. 
t Including Icbihyomyzon Grd. Species P. argenteus Kirt. : P. castaneus (Grd.) Bean: 
P. marinus L. : P. dorsatus Wilder. 
bG7 
