84 
called Ophidium imberbe, Brit. Zool. App. iii., is marked in pencil, 
apparently by Dr. Solander, as being “ Murena Anguilla.” This 
probably explains why the figure is replaced in the edition of 1812 
by Montague’s figure from the Wernerian Transactions, as mentioned 
by Yarrell, Brit. Fishes, 412 & 414, where these two figures are 
copied. 
‘Since this paper was read, there has appeared in the ‘Annals of 
Natural History’ a full description of Mr. Whitehead’s specimen, and 
an account of some other specimens found on other parts of the En- 
glish coast. 
3. MonoGRAPH OF THE Famity LIMNADIADZ, A FAMILY OF 
Entomostracovus Crustacea. By W. Barirp, M.D., F.L.S. 
ETC. 
(Annulosa, Pl. XI.) 
Jean Frederic Hermann, in his ‘ Mémoire Aptérologique,’ published 
at Strasbourg in 1804, described and figured an Entomostracous crus- 
tacean, which from its resemblance to the genus Daphnia of Miller 
and its large size, he called Daphnia gigas. About thirty years pre- 
vious to that time, he tells us, his father discovered a number of these 
interesting little animals in a deep ditch near Strasbourg filled with clear 
rain-water and well-stocked with weeds. Struck with their beauty he 
collected several dozens of specimens, and placing them ina vessel full 
of water less pure than that which the ditch contained, took them 
home. By the time he reached his house however they were all dead 
but one, and he only succeeded in preserving two specimens in spirits 
of wine. Linnzeus had long before that described a species of Mono- 
culus in his ‘ Fauna Suecica,’ under the name of Monoculus lenticu- 
laris, found in Finland. His description is very brief, and Her- 
mann (pére) considering it probable that his animals might be iden- 
tical with the species described by Linnzeus, preserved the shells or 
bucklers of the little creatures which had died, and distributed them 
among his friends and correspondents. He sent some more particu- 
larly to the celebrated Miiller, at that time engaged in working out 
the history of the Entomostraca, and entreated him and his other 
friends to inform him if they considered the specimens he had sent 
to be identical with the Monoculus lenticularis of Linnzeus. Miller 
and his other correspondents all replied that they were not able to 
inform him, as they did not know Linnzeus’s insect—and from that 
time up to the period at which the younger Hermann’s ‘ Mémoire 
Aptérologique’ was published, neither father nor son had ever again 
succeeded in finding these animals. Nothing farther seems to have 
been known of any species belonging to the family till M. Adolphe 
Brongniart in 1820, in the sixth volume of the ‘ Mémoires du Muséum 
d’ Histoire Naturelle,’ published a description of an animal found by 
him in a pool of fresh water at Fontainebleau, which he considered (I 
think erroneously) as identical with the Daphnia gigas of Hermann. 
Of this species he formed his genus Limnadia, and at the same time 
entered fully into the details of the structure and habits of the ani- 
mal, In the ‘ Bulletin de la Société Impériale des Nat. de Moscou ’ 
