406 A. SEDGWICK. 
bers found to be,” and I refer the reader to the case of the 
Nudibranchiata in vol. i, p. 410, which prominently illus- 
trates the same principle. I might also refer to the case of 
fishes (Chimeera and the Dipnoi) as remarkable instances of 
the same phenomenon. 
The case imagined for Peripatus is very similar to that 
of the human race, which consists of an almost continuous, 
interbreeding and variable species. The Australian may be 
said to bear the same relation to the negro—lacking the 
frizzy hair, as Ho-Peripatus does to Neo-Peripatus— 
lacking the small ovum. 
LITERATURE CITED. 
1902. Bouvrsr, E. L.—“ Sur organisation, le dévellopement et les affinités 
du Peripatopsis Blainvillei,” ‘Zool. Jahrbuch. Anat.,’ Suppl. 
5, p. 673. 
‘Monographie des Onychophores,’ Paris, 1907 (‘Ann. des Sci. 
Nat.’ [9], 2 and 5). 
1902. Denpy, A.—‘On the Oviparous Species of the Onychophora,” this 
Journal, 45, p. 363. 
1901 a. Evans, R.—‘‘On two new Species of Peripatus from the Siamese 
Malay States,” this Journal, 44, p. 473. 
“The Development of Hoperipatus weldoni,” this 
Journal, 45, p. 41. 
1895. Fiutcuer, J. J—“On the specific identity of the Australian Peri-. 
patus usually supposed to be Peripatus Leuckarti Sanger,” 
‘Proc. Linn. Soc. N.S.W.’ (2), 10, p. 172. 
1899. Purcatt, W. F.—“ On the South African Species of Peripatus,” ‘Ann. 
S. African Museum,’ i, p. 331. 
“On the Anatomy of Dee ance cinctipes, ete.,’ 
ibid., 2, p. 67. 
1888. Scrater, W. L.—‘‘On the Early Stages of Development of a South 
American Species of Peripatus,” this Journal, 28, p. 343. 
1888. Sepewicx, A.—‘‘ A Monograph of the Species and Distribution of the 
Genus Peripatus,” this Journal, 28, p. 431. 
1907. 
1901 3. 
1901. 
1888. Suezpon, L.—“On the Development of Peripatus nove- 
zealanda,” this Journal, 28, p. 205, and 29, 1889, p. 283. 
1898. Winn, A.—“The Anatomy and Development of P. nove-britan- 
nix,” Zoological Results, Cambridge. 
