18386, ] _ Embryology. 56 3 
the Travailleur and Talisman. These include several Brisingide 
and Stichasteridz ; species of Cribrella and Solaster ; several Pter- 
asteridz, a family almost entirely confined to great depths ; many 
Goniasteridz, and some Archasteride and Porcellanasteride. 
Asteriade and Asterinida are almost wanting, Linckiadz entirely 
so. Sixty-four species is the total, of which fifty are new. 
Mollusks—The Archiv. für Naturgeschichte for 1885 (part 111) 
contains remarks upon the post-embryonal development of the 
Naiadz, by Fred. Schmidt. 
luscan fauna of Behring’s sea (Arch. f. Naturgeschichte, 1885, part 
111) A. Krause enumerates sixty-six Gastropoda, including several 
new species and three Pteropods, one of which i 
Mammals.—Dr. E. L. Trouessart (Ann. d. Sci. Naturelles) sup- 
ports his previously-expressed views that the musk-rat of the 
Antilles should be placed in the genus Hesperomys, but made the 
type of the sub-genus Megalomys. The form of its teeth will 
the P. aris Museum are perhaps all that is left of this curious and 
interesting species. [The name Megalomys is preoccupied.—Zd,] 
EMBRYOLOGY. 
1. THe Devetopment or Patetta.—Dr. William Patten,” of 
Boston, while working in Claus’s laboratory at Trieste, succeeded 
in artificially fertilizing the ova of a species of Patella, the spe- 
cite name of which is not given. The ova measured 0.12™™ in 
diameter ; bluish-green in color and opaque. Acetic acid and 
glycerine were used to render them transparent enough for a 
Study of the general external characters. The internal changes 
Were studied means of sections. The e were matured 
from the first of November to the middle of January. 
~Stuiee by fine pore canals. The micropyle was a wide crater- 
o 
_petting Were a number of highly refractive globules which greatly 
nterfered with the observation of the fecundation an on 
Parent Prolongations arising from the surface of the ovum at the — 
bottom of great ; 
ipa: pe 
„Edited by Joun A. Ryper, Smithsonian Institution, Washington, D. C. 
bryology of Patella. Arbeiten aus: dem Zool. Inst. za Wien, Tom. "i a 
A aa, 2, pp. 149-174, pls. 1 to V, 4885. 
In a second article upon the mol- 
© ova were covered by a very thick transparent chorion, 
pening in the chorion at one pole of the egg; within this 
