BREATHING MECHANISM OF THE LAMPREYS. I I I 



40. If the lamprey feeds when free by means of a current of 

 water entering the mouth it is possible that by a simultaneous 

 closure of velar valves and velar jaws, food particles which would 

 otherwise be swept into the water tube are held between the 

 velar jaws. By the simultaneous opening of the velar valves 

 and velar jaws a current of water from the mouth cavity into the 

 pharynx might carry a food particle from the velar jaws into the 

 open oesophagus. On the other hand, a current of water from 

 the water tube might expel such a food particle through the 

 mouth. 



LITERATURE CITED. 

 Abbot, Chas. C. 



1875 Notes on Fishes of the Delaware River. Report of U. S. Fish Commission 



1875, p. 827. 

 Bert, P. 



1867 Note sur quelques points de la physiologic de la lamproie, Ann. des Sci. 



Nat. Zool. , V. Ser., t. VII., pp. 39 and 40. 

 Couvreur, E. 



1897 La Respiration des Poissons. Mechanisme respiratoire chez les cyclostomes. 



Ann. Soc. Linn. Lyon, N. S., T. 44, pp. 105-109, 2 Figs. 

 Cuvier, G. 



1840 Anatomic Comparee, Second Edition, t. VI., p. 321. 

 Fiirbringer, P. 



1875 Untersuchungen zur vergleichenden Anatomie der Muskulatur des Kopf- 

 skelets der Cyclostomen. Jenaische Zeitschrift, Ed. IX., pp. 1-94, 3 plates. 

 Gage, S. H. 



1893 Lake and Brook Lampreys of New York. Wilder Quarter-Century Book, 



pp. 421-493, 6 plates. 

 Gunther, A. 



1853 Die Fische des Neckars untersucht und beschrieben [pp. 133-136]. 

 Hoppe-Seyler, F. 



1896 Ueber die Vertheilung absorbirter Case im Wasser des Bodensees und ihre 

 Beziehung zu den in ihm lebenden Thieren und Pflanzen. Schriften des 

 Vereins fiir Geschichte des Bodensees und seiner Umgebung, Hft. 24. 

 (Separate, 20 pp. ) 

 Stannius, H. 



1854 Handbuch der Anatomie der Wirbelthiere. Die Fische [p. 210] . 

 Vogt & Yung. 



1889 Lehrbuch der praktichen Vergleichenden Anatomie, Bd. 2, pp. 379-471. 



