ADDENDA ET COBRIGENDA. 



Page 3 (57). BrancSiiostoona lauceoBatum. 



To the synonymy of species No. 1, add: 



(" Umax lanceolatus Pallas, Spicilegia Zool. x, 19, about 1770.") 



Until the Lancelots 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. PwlistotB-ema Gill. 



The generic name Heptatrema Dume'ril (Cuvier, Begne Anini.) has 

 priority over Bdellostoma Miiller. Species 3 may be named 



3. P. stout! (Lockington) J. & G. 



The identity of this species, thus far known only from the coast of 

 California from Santa Barbara northward, with the Chilian H, dombeyi 

 is doubtful. The description, on page 57, is taken from California speci- 

 mens. The genus Polistotrema Gill (Proc. TJ. S. Nat, Mus. 1880, 30) is 

 distinguished by the presence of 11 to 14 gill-openings instead of 6 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. 



6. Lingual teeth pectinate 4. ENTOSPHEXUS* Gill. 



&&. Lingual teeth obscurely tricuspidate 5. AMMOCCETES t Dume'ril. 



aa. Maxillary tooth of 2 or 3 pointed cusps close together; lingual teeth pectinate. 



6. PETROMYZONt L. 



* Species E. tridentatm (Gairdn.) Gill. 



t Including Lampetra Gray. Species A. plumbeus (Ayres) Bean: A. aureus Bean: A. 

 niger (Raf.) Jor. : A appendix (Dek.) J. fc G. 



I Including Ichthyomyzon Grd. Species P. argenteus Kirt. : P. castaneus (Grd.) Bean: 



P. marinus L. : P. dorsatus Wilder. 



8G7 



