190. General Notes. [ February, 
enormously developed,*and the dorsal branches of the various 
cranial nerves which supply these, and which center in the ¢ader- 
culum acusticum of the brain, are correspondingly large. This 
appears to me an additional confirmation of the theory advanced 
by Schultze and Mayser, that the cutaneous sense-organs of this 
class constitute a form of auditory organ.—R. Ramsay Wright, 
University College, Toronto, Dec. 18, 1884. : 
P. S.—After writing the above, I learn from Professor Wilder 
that he indicated the existence of rudimentary spiracles in Amia 
and Lepidosteus at the A. A. A. S. in 1878. His MS., which 
remains unpublished, discusses the nature of the spiracles and 
their persistence in a more or less complete form in Selachians, 
Ganoids and the Teleost Megalops, describes the form and rela- 
tions of the spircular clefts in the adult Amia, and concludes that 
these are open in the young. 
The relation of the pseudobranchia referred to above is not in- 
dicated. —R. &. W. 
THE Larva OF EsTHERIA MEXICANA.—(The following descrip- 
tions and figures were received from the late Mr. V. T. Chambers 
in 1873, and overlooked in the preparation of my inonograph of 
North American Phyllopoda. As we know nothing of the develop- 
ment of American Estheriz except what is given by Dr. Gissler in 
my monograph, it may be well to publish the drawings and de- 
scription of Mr. Chambers. I have identified the species from 
specimens of the shell sent by the author.—A. S. Packard.) 
I send by this mail the fragments of the shell of the Estheria 
and two camera drawings of the nauplius in different stages, and 
a drawing of a section of the shell showing the markings. o 
not know whether the nauplius has been previously figured or 
not, as my knowledge of the genus is confined mainly to Baird’s 
monograph in Ann. and Mag. Nat. Hist., Ser. 2, Vol. vi, p. 53; t. 
R. Jones in Quar. Micro. Fournal, and a few references in the Z0d- 
Out 
of the hundreds of eggs only four produced Nauplii, and unfor- 
short. Fig. I bears a good general resemblance to Baird’s figure 
of Artemia tun. It seems to me, however, to approach more 
12, clarkii, now regarded as a synonym of Claus’ Æ. mexicana. 
oe re E E NS EES Hie ab WRT a RTS ai AN E 
BRR SLM cee aE SR OT OTN 
