Miscellaneous. 69 
from the branchia at the base, to be continued by the auricle of the 
heart.— Comptes Rendus, November 12, 1883, p. 1076. 
Injury sustained by the Eye of a Trilobite at the Time of the 
Moulting of the Shell.. By Cuartes D. Waxcorr. 
Mr. William P. Rust, of Trenton Falls, N. Y., called my atten- 
tion some time since to the eyes of a small but very perfect speci- 
men of Jllenus crassicauda, from the Trenton Limestone, that he has 
in his beautiful collection of Trenton fossils. 
The left eye is perfect: the visual surface is clearly defined, and 
in the sunlight almost translucent between the darker base and the 
curve of the facial suture above. The right eye at first sight ap- 
pears to have been broken in working away the matrix ; but aclose 
examination shows, as Mr. Rust expressed it, that the eye had 
been put out while the animal was living. This is shown by the 
peculiar growth of the shell about the aperture formerly occupied by 
the visual surface of the eye. The margins are turned in, rounded, 
and contracted, and the size of the palpebral lobe materially lessened. 
An injury to the visual surface would scarcely produce this effect if 
the shell was hard. If slightly injured before the moulting of the 
shell the separation would be imperfect and the visual surface carried 
away with the old shell would leave a cavity around which the new 
shell would form, as in the eye before us. If injured before the new 
shell had hardened, that effect might be produced; but the proba- 
bilities are, that the loss of the visual surface occurred at the time 
of the moulting of the old shell. 
Among the thousands of trilobites that have passed through my 
hands in which the eyes were preserved I have never noticed any 
distortion or injury that occurred during the life of the animal. 
In a few instances the shell of the pygidium of Asaphus platyce- 
phalus has shown evidence of local fracture that appears to have 
occurred during the life of the animal, but these were very unsatis- 
factory. To Mr. Rust’s skill in working out the specimen described, 
and also in detecting the character of the injured eye, we are in- 
debted for some positive information of an injury sustained during 
the moulting of the shell of a trilobite —<Amer. Journ. Science, Oct. 
1883, p. 302. 
The Pelagic and Deep Faunas of the two Lakes of Savoy (the Lae 
du Bourget and Lac d’ Annecy). By Dr. O. E, Imnor., 
The Lac du Bourget is 17 kilom. long and about 5 kilom. broad, 
and its depth is stated at 80-100 metres. The Lac d’Annecy mea- 
sures 14 kilom. in length, and its greatest breadth is 33 kilom. ; its 
greatest depth is estimated at 62 metres. 
In the Lac du Bourget on the 5th October the author obtained at 
20 metres Daphnella brachyura, Liev., Leptodora hyalina, Lillj., a 
