STATISTICAL BIOLOGICAL STUDY. 77 



METAMERICALLY REPEATED ORGANS. Fin-rays of fishes, 

 Duncker, '97; coxal pores centipede, Williams, '03; seg- 

 ments of shrimp Crangon, Weldon, '92. 



Num. dorsal spines and soft fin-rays, Acerina .379 



" " " Cottus 110 



" coxal pores R. anal and 14th segment, Lithobius 440 



R. 13th and 14th segments, Lithobius 722 



R. 13th and 12th segments, Lithobius 464 



Length carapace and post-spinous portion rostrum, Crangon 81 



" tergum VI abd. seg., Crangon 09 



tergum VI and telson, Crangon . 11 



MIXED AND CROSS CORRELATION. Length of wing and tail of 

 Lanius " shrike," Strong, '01; in fishes, Duncker, '97, '99; pro- 

 portions of aphids, "plant-lice," Warren, '02; coxal pores 

 of centipede, Williams, '03; length of carapace and of chelae 

 in Eupagurus, "hermit-crab," Schuster, '02; diameter of 

 cell and body length, Daphnia, Warren, '03; cross correla- 

 tion in teeth on jaws of Nereis, Hefferan, '00; various char- 

 acters of the mud-snail, Nassa, Dimon, '02; 'circumference to 

 number of spines, statoblast of Bryozoa, Davenport, '00*. 

 diameter of body of the Heliozoan Actinosphserium Echorni 

 and the number of cysts and of nuclei, Smith, '03; inner and 

 outer diameters and color of the shell of Arcella, Pearl and 

 Dunbar, '03. 



Organs. r 



Carapace length and chela length, Eupagurus, 9389 0036 



" 9 .8626.0080 



Diameter of body of Actinospherian and num. of nuclei .854 . 017 



Inner and outer diameter shell of Arc'ella 836 .007 



Diam. of body of Actinosphaerium and num. of cysts. . .769 .026 



Wing length and tail length, Lanius 569 



Diam. of cell and body length, Daphnia, hatching to 



3d molt 551 



Diaro. of cell an/1 body length, Daphnia, 3d to 4th 



molt 393 



Diam. of cell and body length, Daphnia, after 4th molt.. . 248 



Num. coxal pores, R. anal and L. 12th seg. , Lithobius. . . . 427 . 046 



Frontal breadth and antennal length (Warren, '02) 320 .032 



Ccxal pores, R. 14th leg and body length, Lithobius.. . .308 .059 

 Num. rays dorsal fin and end-point of L. lateral line, 



Pleuronectes, $ 208 



Outer diameter and color Arcella 012 



Num. dorsal spines and L. pectoral rays, Pleuronectes. .001 



