152 THE ZOOLOGIST. 
aparr. Dr. Day further stated that pure salmon-eggs have been hatched 
in the Howieton fishery; that the young have grown to parr, smolts and 
grilse ; that these latter have yielded eggs, and their eggs have been success- 
fully hatched. Although some time must elapse before it can be ascertained 
how these young Salmon will thrive, how large they will eventually become 
in fresh-water ponds, and whether a land-locked race may be expected from 
them, still the following points seem to have been established :—That male 
parrs or smolts may afford milt capable of fertilising ova; but if taken from 
fish in their second season, at thirty-two months of age, they are insufficient 
to produce vigorous fry. That female smolts or grilse may yield eggs at 
thirty-two months of age, but those a year older are better adapted for the 
production of vigorous fry; wherefore to develope ova a visit to the sea is 
not a physiological necessity. That young male Salmon are more matured 
for breeding purposes than are young females of the same season’s growth. 
That female Salmonide under twenty-four months of age, although they 
may yield ova, are of little use for breeding purposes, the young, if produced, 
being generally weak or malformed. That at Howieton hybrids between 
Trout and Salmon have so far proved to be sterile. Furthermore, it was 
stated that the size of eggs of the Salmonide vary with the age and 
condition of the parent; but, as a rule, older fish yield larger ova than the 
younger ones. Even among the eggs of individual fish variations occur in 
the size of the ova. From larger ova finer and rapidly growing fry are 
produced; consequently, by a judicious seleetion of breeding fish, races 
may be improved, while it is only where segregation is efficiently carried 
out that such selection is possible. 
March 19, 1885.—Sir Joun Lussock, Bart., F.R.S., M.P., President, 
in the chair. 
Dr. John Grieve, of Bridge of Allan (N. B.), and Mr. Charles T. Drury, 
of Forest Gate, Essex, were elected Fellows of the Society. 
Dr. G. J. Romanes exhibited two human crania from South Africa. 
One was that of an aboriginal Bushman from Kruis River, Congo district, 
Gudtsboora, obtained through Dr. Stroud. 
A communication was read ‘“‘ On new Hydroids,” by Prof. Allman. The 
paper consists of diagnoses with more detailed descriptions of hitherto 
undescribed species of Hydroida contained in a collection belonging to 
Miss Gatty, who placed it in the author’s hands for determination and 
description. Thirty-eight species, distributed among twelve genera, are 
described as new. Among these the new Plumularian genus Podocladium 
is very remarkable, not only by the possession of both fixed and movable 
nematophores, in accordance with which, like Heteroplon of the ‘ Challenger’ 
collection, it holds a position intermediate between the typical Eleuthero- 
plean and the Stetoplean genera; but by the fact that every hydrocladium 
