904 THE AMERICAN NATURALIST. (VoL. XXXIII. 
Notes. — JVectonema agile has been reported by Pintner (SB. math.- 
natw. Cl. K. Akad., Wien, 13. April, 1899) from the Bay of Naples. 
In March a single specimen was collected and in May two others. As 
it is hardly credible that such a conspicuous form could have been 
overlooked hitherto, this sudden appearance so remote from the south 
shore of New England, the only locality from which it has heretofore 
been recorded, is certainly remarkable. 
The cestodes of the Bergen Museum have recently been stud- 
ied by Lonnberg (Bergens Museums Aarbog, No. 4, 1898). An 
extended study was made of Ccenomorphus, the peculiar tetrarhyn- 
chid larva of P. J. van Beneden. According to the author it departs 
widely enough from the typical tetrarhynchids to be regarded the 
representative of a new subfamily. Its anatomy is well illustrated, 
as also that of some other cestodes. 
Gordii from Malaysia and Mexico are discussed by Camerano 
(Atti Acc. Sci. Torino, Vol. XXXIV, 1899). The two Mexican forms 
are species of the genus Chordodes. 
The South African species of Peripatus are enumerated by Purcell 
(Ann. of South African Mus., 1899), who describes seven distinct and 
one doubtful species. He accepts Pocock’s subdivision of the genus 
Peripatus and includes the South African species in Peripatopsis and 
a new genus, Opisthopatus. 
Maurer has placed considerable weight upon the distribution of 
the hair in embryo mammals as evidence for the derivation of hair 
from epidermal sense organs (see this journal, Vol. XXXI, p. 767). 
De Meijere has studied the subject and concludes (Anat. Anz., Bd. 
XVI, p. 249) that this distribution affords little support for Maurer’s 
views. In this connection it is to be noted that Kromayer (Archiv 
Jür Entwickelungsmechanik, Bd. VIII) describes the hair as having a 
dermal Anlage. 
Negri has followed the processes described by Petrone for demon- 
strating the nucleus in the red-blood corpuscles in the mammals. He 
finds (Anat. Anz., Bd. XVI, p. 33) that Petrone’s methods (osmic 
acid, 1 : 4000; picric acid, 1 : 4000; formic acid carmine) give a 
differentiated central portion in the corpuscle. The same methods 
applied to the blood of embryonic mammals bring out a similar struc- 
ture, while at the same time haematoxylin differentiates a true nucleus. 
Hence he concludes that Petrone’s structure is not a true nucleus, 
