LIST OF PUBLICATIONS HYDROZOA. 489 
Zool. Rec. vi. p. 663. In the Addenda ” additional species of Pennatulid® 
and Gorgoniid® are given. 
V ERRiLL^ A. E. Notes on Radiata.— No. 7. On the GeO- 
graphieal Distribution of the Polypes of the West Coast of 
America. Tr. Conn. Ac. i. pp. 558-567. 
. Synopsis of the Polypes and Corals of the North* 
Pacific Exploring Expedition, under Commodore C. Ring- 
gold and Capt. J. Rogers, U.S.N., from 1853-^1856, col- 
lected by Dr. Wm. Stimpson, Naturalist to the Expe- 
dition. Pt. IV. Actinaria. P. Ess. Inst. vi. pt. 1, pp. 51, 
1868-1870. 
This sjmopsis is continued from vol. V. p. 330, of the same ‘ Proceedings,’ 
for which see Zool. Rec. v. p. 668. In the present part the Actinaria are 
finished, whereon follow additions and corrections to the Alcyonaria and 
Madreporaria ; lastly, a geographical list is given of the species enunciated in 
the synopsis. 
. Contributions to Zoology from the Museum of Yale Col- 
lege. — No. 5. Descriptions of Echinoderms and Corals 
from the Gulf of California. Am. J. Sc. xlix. pp. 93- 
100 . 
. Contributions to Zoology from the Museum of Yale Col- 
lege. — No. 7. Descriptions of new Corals. Am. J. Sc. xlix. 
pp. 370-375. 
HYDROZOA. 
Hydroida. 
Allman, Trans. R. Sec. Edinb. xxvi. pp. 97-106, gives, by means of brief 
formul®, some very clear illustrations of the law of the genetic succession of 
zooids in the Hydroida, from the simplest to the most complex phases of 
polymorphism in this class. He draws also some interesting comparisons be- 
tween the arrangement of generative zooids in many IIydro2oa and several 
forms of inflorescence in plants. 
MetschnikoFF (Hull. Pet. xv. pp. 95-100) observed the development of 
the ova of an Oceania (allied to O. Jlavidula, Gyl.), and of a Tiara (related to 
T. smaragdina, Hiick.) into planul® and poRpe-stocks. Cunina {JEgmeta) 
jfavescens and JEginojms meditcrranca were observed directly developed from 
eggs. In Carmarina hastata, the youngest form described by Hackel was also 
seen to be developed directly from the egg. In Cunina rliododactyla the buds, 
some found already loose in the stomach, others developed from the back of 
the parent, formed medusids agreeing so with the adult, in their marginal 
vesicles and tentacles, that there is here no dimorphism of the two genera- 
tions. 
Greefp has described (Z. wiss. Zool. 1870, p. 37) a hydroid polype, re- 
sembling in the principal points of its structure the ordinary freshwater 
1870. [vol. vii.] 3 K 
