3 Proch. 
Systematic Index. 
STRUCTURE. 
Dakin, 3 ; Hartmeyer, 6-8. 
Ovum ; Hirschler, 9. 
Nervous Svstcm ; Kutchin, 10. 
PHYSIOLOGY. 
BaumSzon, 3a. 
DEVELOPMENT. 
Della Valle, 4 ; S61ys-Longchamps, 
13 ; Soubbotine, 14. 
DISTRIBUTION. 
N. Atlantic, Bigelow, 1 ; Caullery et 
Mesnil, 2; Ostenfeld, 11. 
Gulf of Kola ; Derjugin, 5. 
Red Sea ; Hartmeyer, 6, 7. 
Abrolhos ; Dakin, 8. 
III.— SYSTEMATIC INDEX. 
Tunic ata. 
Aplidium flavum, Derjugin 5. 
Ascidia perfluxa, Hartmeyer 8 ; 
A. savignyi sp. n. Gulf of Suez, Hart- 
meyer Sitzb. Ges., Natf. Freunde 
Berlin 1915 p. 404. 
Clavelina, Della Valle 4. 
Gnemidocarpa hcmprichi p. 218 figs. 
0-7, Red Sea, madagascariensis p. 222 
figs. 8-9, S.W. Madagascar, robinsoni 
p. 224 figs. 10-13 Juan Fernandez spp. n., 
Hartmeyer Mitt. Zoo). Mus. Berlin 
8 ( 2 ). 
Pelonaia corrugata , Derjugin 5. 
Polycarpa ehrenbergi sp. n. Red Sea, 
Hartmeyer Mitt. Zool. Mus. Berlin 8 
(2) p. 213 figs. 
Slolonica, socialis blastogenesis S£lys- 
Longchamps 13. 
Tethyum rhizopus var. murmanense , 
derjugin 5. 
Cephalociiordata. 
Amphioxus nervous system. Kutchin 
10 
Enteropnetjsta and Pterobranctiia. 
Ptychodera pelsarti sp. n. Abrolhos 
Is., Dakin J. Linn. Soc. 33 p. 85 pis. x, 
xi. 
Dolichoglossus Jcovaleskii, Caullery 
et Mesnil 2 
