268 DR. P. P. CARPENTER ON NEW SPECIES [Mar. 14, 
the microscope, with a moderate power, this beaded aspect is lost, 
and the barbule appears merely divided by faint transverse partitions 
into a series of cells, some of which, towards the apex, exhibit small 
tooth-like projections representing the rudiments of barbicels (fig. 3). 
All the barbs remaining on the feathers appear to be imperfect. 
The barbs of the accessory plume are of the same general struc- 
ture as those on the main shaft, but they appear to form a single 
series on each side from the base. 
The barbs nearest the base of the feather, both in the main web 
and the accessory plume, are destitute of barbules for some distance 
from their base ; but this distance gradually decreases until the barb 
is furnished with barbules throughout its whole length. 
It is evidently impossible to determine from these mere fragments 
of feathers what was the precise structure of those organs when per- 
fect; we cannot even decide whether the basal barbs possessed the 
hair-like tips characteristic of those of the Emu and Cassowary, and 
still less whether the apical portion of the feather supported simple 
barbs such as occupy that position in those birds. The only fact of 
importance, indeed, that I can hope to make known by this paper is 
that the Dinornithes undoubtedly possessed a large accessory plume, 
thus adding another proof of their relationship to the green-egged 
Emus and Cassowaries existing in the Australian region, and of their 
difference from the white-egged group of Struthiones represented 
in Africa and South America. 
3. Dracnoses oF New Species anp A New Genus or Mot- 
LUSKS FROM THE REe1IGEN MazaTLaAn COLLECTION: WITH 
AN ACCOUNT OF ADDITIONAL SPECIMENS PRESENTED TO 
THE British Museum. By Puxtvip P. Carpenter, B.A., 
Pu.D. 
After the publication of the British Museum Mazatlan Catalogue, 
the backs of several fresh Spondylus-valves were examined by Mr. 
R. D. Darbishire aud myself. Among the specimens were several 
which were deemed worthy of being added to the national collection ; 
they were deposited there, with a MS. appendix to the Catalogue, 
in 1858. As it is not judged necessary to print this separately, I 
have (with the permission of Dr. Gray) transcribed what should be 
placed on record, in hopes that it may not be judged out of place 
in the ‘ Proceedings.’ Those who use the Mazatlan Catalogue are 
requested to observe not only the corrections in the Appendix, 
pp- 547-552, but also those made in the Review of Professor C. B. 
Adams’s Panama Catalogue, P. Z. 8S. 1863, p. 339; and in the 
British Association Reports, 1863, pp. 543 et seg. The numbers, 
both of species and of tablets, are continued from the Mazatlan 
Catalogue, and correspond with those in the Report. The student 
of the Gulf fauna should also consult the account of Mr. Xantus’s 
