EMBRYOLOGY OF THE SEA BASS. 
271 
Sauropsida is not well known, and that it is quite possible that further study may 
show the presence of a peripheral ingrowth in these embryos. Indeed Kollmaun’s 
ligures (30) of sections through young chick blastoderms almost prove the existence 
of such an ingrowth. The later history of the blastoderm edge is extremely compli- 
cated, and the morphology of the region must be studied before the complications 
arise. If it should turn out that there is, as Kollmanu believes, an ingrowth of cells 
from the blastoderm edge (which becomes a source of blood cells) the homology of the 
blastoderm edge in Ichthyopsida and Amuiota would be proved. But Kollmann’s 
conclusion that this peripheral ingrowth, or akroblast, is a special organ (homologous 
with the mesenchyme cells of certain invertebrate embryos) would not hold. For the 
akroblast would merely represent the last stage in the course of development, which 
the ventral mesoderm of simple vertebrate embryos (Amphibia, Petromyzon) has 
undergone. 
Wood’s Hold, July 22, 1890. 
LIST OF PAPERS REFEREED TO. 
1. Agassiz and Whitman, C. O. On the development of some Pelaijic Fish Eggs. Preliminary 
Notice. Proo. Amer. Acad. Arts and Sciences, xx, 1884. 
2. Allis, E. P. Jr. Anatomy and Development of the Lateral Line System in Amia calva. Journal 
of Morphology, 1889. 
3. Brook, G. On the Origin of the Hypoblast in Pelagic Teleosteau Ova. Quart. Journ. Micr. Sci., 
1885. 
4. Brook, G. Note on the origin of the Wolffian Duct in Teleostei. Proc. Royal Soc., Edinburgh, 
Vol. XIV, 1887. 
5. Beard, John. Branchial Sense Organs of Ichthyopsida. Quart. Journ. Micr. Sci., 1885. 
6. Beard, John. On the Segmental Sense Organs of the Lateral Line, etc. Zool. Anzeiger, 1884. 
7. Baleour, F. M. a Comparison of the Early Stages in the Development of Veretbratos. Quart. 
Journ. Micr. Sci., 1875. 
8. Cunningham, J. T. On the Relations of the Yolk to the Gastrula in Teleosteaus^and in other 
Vertebrate Types. Quart. Journ. Micr. Sci., 1885. 
9. Cunningham, J. T. The Significance of Kupffer’s Vesicle, etc. Quart. Journ. Micr. Sci., 1885. 
10. Calberla, E. Zur Entw. des Medullarrohres uud der Chorda dorsalis d. Teleostier und d. Pe- 
tromyzouteu. Morph. Jahrbuch, 1877. 
11. Eisig, H. Die Segmentalorgaue der Capitelliden Mitt. a. d. Zool. Station zu Neapel, 1879. 
12. G. Brown Goode and Associates. Fisheries and Fishery Industries of the United States. Sec. 
1, History of Aquatic Animals, Washington, 1884. 
13. Gensch, Hugo. Das secundare Entoderm und die Bluthi Idling heim Ei der Kuochenfische. Inau- 
gural Dissertation, Konigsberg, 1882. 
14. Gotte, A. Der Keim des Forelleneies. Archiv f. Mikr. Anat., 1873. 
15. Gotte, A. Zur Entwiokl. d. Wirbelthiere. Vorlaufige Mitt., in Ceutralblatt fur die Medicin. Wis- 
senschaften No. 26, 1869, 
16. Gotte, A. Ueber die Entwicklung d. Central Nerv. System d. Teleostier. Archiv f. Mikr. Anat., 
1878. 
17. Hoffmann, C. K. Zur Ontogenie der Kuochenfische. Verhandelingen d. Konink. Akad. d. Wet- 
enschappeu zu Amsterdam, 1881-1883. 
18. Henneguy, Felix. Rdcherches sur la developpement des Poissons Osseux. Emhryogeuie de la 
Truite. Journal de I’Auat. et de la Physiologie, 1888. 
19. Haeckel, E. Die Gastrnla und die Eifurchung der Thiere. Jena Zeitschrift, 1875. 
20. Hertwig, O. Die Entwicklung des Mittleren Keim-hlattes der Wirbelthiere. Jena Zeit., 1881, 
1882. 
21. Hoff.mann, C. K. Zur Ontogenie d. Knochenfische. Archiv f. Mikr. Anat., 1883. 
22. Hertwig, O. Lehrhuch der Entwickluugsgeschichte des Meuschen und der Wirbelthiere. Zweite 
Auflage, Jena, 1888. 
