Goel. 7 
LIST OF PAPERS, MORPHOLOGY. 
89. Wagner, J. Recherches sur l’Orgamsation de Monobrachium para- 
siticum. Arch. Biol, x, pp. 273-810, 2 pis. Abstr. in J. R. Micr. 
Soc. 1891, pt. 1, pp. 52 & 53. 
90. Webster, C. L. Description of a New Genus of Corals ( Macgeea ) 
from the Devonian Rocks of Iowa. Am. Nat. xxiii, pp. 710-712. 
91. Weismann, A. Bemerkungen zu Ischikawa’s Umkehrungsver- 
suchen an Hydra. Arch. mikr. Anat. xxxvi, 4 Heft, pp. 627-638. 
Abstr. in J. R. Micr. Soc. 1891, pt. 2, pp. 203 & 204. 
92. Wentzel, J. Ueber fossile Hydrocorallinen ( Stromatopora und ihre 
Yerwandten). Lotos, ix, pp. 1-24, 3 pis. 
93. Wharton, W. J. L. (1) Coral Reefs : Fossil and Recent. Nature, 
xlii, p. 81 ; (2) p. 172. 
. (3) Drowned Atolls. T. c. p. 222. 
94. Wilson, H. Y. On a new Actinia, Hoplophoria coralligens. Stud. 
Biol. Lab. J. Hopkins Univ. iv, No. 6, pp. 379-387, pi. xliii. Abstr. 
in J. R. Micr, Soc. 1890, pt. 3, p. 338. 
95. Zacharias, O. Ueber neuere Umkehrungsversuche an Hydra 
[ISCHIKAWA, vide Zool. Rec. 1889.] Biol. Centralbl. x, No. 3, pp. 
92-95. Humboldt (Dammer) : 9 Jhrg., 5 Heft, pp. 174 & 175. 
96. . Ueber ein interessantes Kapitel der Seenkunde. Biol. 
Centralbl. x : Codentcrata in fresh water, p. 124. 
U.— MORPHOLOGY. 
General. 
A concise and well illustrated account of the developmental history of 
the Ccdenterata will be found in the first part of Korsciielt & Heider’s 
text book (55). 
Yon Marenzeller (66) gives a very useful list of the popular German 
names of many of the genera of Ccelenterata. 
Hydro zoa. 
Brauer (14), in a preliminary note on the development of Hydra 
aurantiaca , states that the polar bodies are normally formed on the side 
of the egg turned away from the parent before the ectoderm sheath is 
ruptured. The molecules in the polar bodies are not yelk spherules, but 
nuclear fragments. A blastula is formed by total and regular segraenta* 
tion of the ovum. The blastoccel is formed at the stage with eight seg- 
ments. The endoderm is formed by mixed delamination. The ectodermic 
sheath is not lost on the formation of the ectoderm of the embryo. The 
eggshell is a cuticular structure. 
Nussbaum (73), and Weismann (91) discuss Ischikawa’s investigations 
on the artificial introversion of Hydra [ vide Zool. Rec. 1889]. 
