Zoology. 1121 
lids. Peripatus, of which so much was expected in throwing light 
upon the origin of the “ Tracheates” seems to fail in this respect, 
and must be regarded as nearer to the Annelids than to either 
Myriapod or Hexapod stock.—J. S. Kingsley. 
Bioop CorpuscLEs OF THE LAMPREY. — S. H. Gage states 
(The Microscope, VIII.) that the blood corpuscles of the lamprey are 
unlike those of the non mammalian vertebrates and like the mam- 
FIBRES oF SHort Muscies. — In order to ascertain whether 
the statement made by Kölliker that in the short muscles of the 
fish, frog and bat, the fibres are of the same length as the muscle, 
and have rounded ends, is applicable to the more minute vertebrates, 
. S. P. Gage has studied the muscles of the mouse, shrew, bat 
and English sparrow. She concludes (Zhe Microscope, VIII.) that 
the muscular fibres may extend from end to end or may terminate 
at one or both ends within the muscle, tapering to a point. She 
cludes that the difference between the skeletal and cardiac mus- 
cles is not so great as has been supposed. | 
NOTES on THE AMERICAN TRIONYCHIDa.— According to 
Agassiz there are six species of American Trionychide, belonging to 
three different genera. 
I am indebted to Prof. G. Brown Goode and Mr. F. A. Lucas, 
of the Smithsonian Institution ; to Prof. A. Agassiz and Dr. S. 
Garman, of the Museum of Comparative Zoology in Cambridge ;* 
to Prof. A. Gunther and Mr. G. A. Boulenger, of the British 
Museum, to Prof. O. C. Marsh, of the Peabody Museum, to Mr. 
T. Gillespie, of Hard Times Landing, La.; for the opportunity 
they have given me to examine a great number of American 
Trionychide. oo 
s a preliminary report I may note the following conclusions :— 
1. The type of Testudo ferox Schneider, descri y Garden= 
Pennant in the Philosophical Transactions of London for 1771, is 
not Piatypeltis of Agassiz; but a species of Axpidonectes. : 
. ltis ferox of Agassiz is not Zestudo ferox Schneider, 
bnt a new species, which may be called Platypeltis Agassizit. 
3. Callinia microcephala Gray, of the British Museum, with the 
locality Sarawak, is Amyda mutica Les. 
1 To Prof. Angelo Heilprin of the Philadelphia Academy. 
