CRANGON VULGARIS. 35 



5. All of the appendages belong to the primitively post- 

 oral series, and the appendages move forward more rap- 

 idly than the corresponding ganglia. 



6. There are indications of segmental sense organs in 

 every segment of the embryo. 



7. The alimentary tract proper is nearly, if not en- 

 tirely, formed from the proctodeal and stomodeal invagi- 

 nations, theentoderm giving rise to nothing but the liver. 



8. The green gland is mesoderraal in origin and be- 

 lono^s to the cateo-orv of seojmental oro^ans. 



1). The genital ducts are modified nephridia. 

 10. The nauplius is an introduced feature and repre- 

 sents no adult ancestral condition in the crustacean phylum. 



BiBLIOGRAPHY. 



'52, Agassiz, L. — Zoological Notes from Correspondence. — Am. Jour. 



Sei., II, XIII, pp. 425-6. 1852. 

 '56, Zöological Notes from Correspondence. — Am. Jour. Sei., II, 



XXII, pp. 285-286. 1856. 

 '84, Ayers, Howard. — On the Development of CEcanthus niveus and 



its parasite Teleas. Mem. Boston Sog. Nat. Hist., in, pp. 225 



-281, Pls. xviii-xxv. 1884. 

 '80, Balfour, Francis Maitland. — A Treatise on Coraparative Embryo- 



logy, Vol. I. London, 1880. 

 '80«, Notes on the Development of the Araneina. — Quar. Jour. 



Micros. Sei. xx, pp. 167-189, Pls. xix-xxi. 1880. 



'81, Treatise ou Comparative Embryology, Vol. ii. 



'76, Bäte, Charles Spence. — On the Development of the Crustacean 



Embryo [etc.]— Proc. Roy. Soc. xxiv, pp. 375-379. 1876. 

 '73, Bobretzky, N. — [Embryology of Arthropods] Russian. — Mera. 



Kiew Nat. Soc. in, pp. 129-263, Pls. i-vi. 1873. Abst. by Hoyer, 



in Hoflfmann and Schwalbe's Jahresbericht, ii, 312-318. 1875. 

 '74, Zur Embryologie des Oniscus murarius. — Zeitschr. wiss. 



ZooL, XXIV, pp. 179-203, Pls. 21-22. 1874. 

 '78, lieber die Bildung des Blastoderms und der Kiemblätter 



bei den Insecten.— Zeit. w. Zool., xxxi, pp. 195-215, PI. xiv. 1878. 

 '69, Brandt, Alexander. — Beiträge zur Entwicklungsgeschichte der 



