30 



E. LÖNNBERG, THE ICHTHYOLOGY OF THE CASPIAN SEA, 



amphipoda found in its stomach. — Although a plankton 

 feeder Clupca caspia has not at all prolonged the intestine 

 or laid it in coils, as the North American Brcvoortia, which 

 indicates that it is the animal plankton which supplies its 

 Ibod. It seems, however, as if the walls of the pyloric por- 

 tion of the stomach should be thicker in C. caspia than in 

 C. saposhnihovi. 



In the following are reproduced tables of comparative 

 measurements of these three Clupea (Alosa) species. 



Clupea Kessleri Grimm. 



Total length in mm 



% of total length: 



a. Length of head 



h. Depth of body 



c. Least depth of oaudal peduncle . 



d. Prseorbital length 



e. Postorbital * 



f. Diameter of eye 



g. Distance from snout to dorsal lin . 

 Ä. » ■> i -> ventral fins 

 i. » » j i anal fin . . 



j. Praeabdominal length 



k. Postabdominal » ...... 



1. Base of dorsal fin 



w. » » anal > 



n. Length of pectoral fins 



o. Height of dorsal fin 



p. Length of maxillary 



Number of gillrakers 



The above measured specimens are from Petrovsk. 



In addition to these I connted the gillrakers of ten spe- 

 cimens from the Volga delta and found the number varying 

 from 60 to 72 and counting the gillrakers of several speci- 

 mens in Petrovsk I found their number from 64 to 80. The 

 limits of variation is thus probably, as a rule, 60 — 80. 



