88 Messrs. Hancock and Embleton on the Anatomy of Eolis. 
pellucids0; interiores petaloidese, tenerrimse. Stamina tria; fila- 
menta gracilia, antheris longiora ; antherse obovatse, compressse, 
loculis granulis pollinis inter se cdnglomeratis repletis, dehiscentia 
ignota. Stigmata tria, bipartita (?), cruribus recurvis perianthii 
laciniis exterioribus duplo longioribus. 
Ohs. Elodea canadensis (Michx.) a specie supra descripta difFert, 
ob verba auctoris in delineatione characteris generici, “ ovarium ad 
caulem sessile.” Inde stirps ad Anacharidem canadensem (Planch.) 
verosimiliter recte referta. 
EXPLANATION OF PLATE VIII. 
Anacharis Ahlnastrum , natural size, with a detached flower showing its 
very long tube. 
Note . — The flower, the only one obtained, is doubtless imperfect, by 
wanting the third stigma. 
a. A whorl of leaves. 
h. Summit of the sheath. 
c. A female flower. 
d. Stigmatic fringe. 
We are indebted to Mr. J. W. Salter for the beautiful drawing, 
made for the ^ Supplement to English Botany,^ from which our 
plate is engraved. 
Magnified. 
IX. — On the Anatomy 0 / Eolis, a genus of Mollusks of the order 
Nudibranchiata. By Albany Hancock and Dennis Em- 
bleton, M.D., F.R.C.S.E., Lecturer on Anatomy and Phy- 
siology in the Newcastle-upon-Tyne School of Medicine. 
[Continued from vol. xv. p. 88.] 
[With two Plates.] 
Organs of Generation. 
For the sake of convenience we will treat of these in the fol- 
lowing order : — 
1st. Male apparatus : testis and penis, and mechanism for 
intromission and retraction. 
2nd. Female apparatus : ovary with oviduct and accessory 
glands. 
3rd. Complementary androgynous organs : spermatheca and 
its channels. 
The generative organs lie for the most part beneath all the 
other viscera, and occupy the greatest part of the cavity of the 
body. The ovary at the season of reproduction nearly fills up 
the posterior half of the body, and the median line divides it 
into two almost symmetrical parts. 
The other organs lie in front of the ovary, and extend as far 
forwards as the sides of the buccal mass ; they are unsymmetrical, 
