778 
ME. H. N. MOSELEY ON THE STEUCTUEE AND 
sailing for the Antarctic regions, having been consumed in actual examination of the 
structure of Peripatus), and due, further, to the impossibility of referring in any scientific 
library to original papers. At all events it is hoped that Peripatus has been shown to 
be of very great zoological interest, as lyiqg near one of the main stems of the great 
zoological family tree, and that further examination of the most minute character into 
the structure of this animal will well be repaid. 
Description op the Plates. 
(The whole of the Plates represent structures occurring in Peripatus.) 
PLATE LXXII. 
Dissection of Peripatus , drawn by Mr. J. J. Wild. 
Fig. 1. Female laid open from the back, to show the general arrangement of the viscera. 
a. Antennae; c.g. Cephalic ganglia; v. e. Ventral nerve-cords; op. Optic 
nerve ; n. Nerve to the papilla, in which the ejaculatory duct of the slime- 
gland terminates. 
x. Lateral canals of Grube = “ fat-bodies.” 
s. g. Slime-glands = testes of Grube. 
e. s. Muscular ejaculatory sacs of these glands. 
r. m. Retractor muscles of the head. 
p. Pharynx with a pair of small linear protractor muscles on its upper 
surface, oe. (Esophagus. 
s. Stomach. 
i. Intestine. 
an. Anus. 
o. Ovary. 
od. Oviduct. 
u. Tubular uterus. The successive constrictions separate off sacs, each 
of which contains an embryo in process of development. 
ic. Overhand knot formed by the oviduct over the bight of the uterus. 
The two tubes of the uterus join into a common canal behind the 
intestine close to the vulva. 
On the inner surfaces of the reflected walls of the body are seen the 
numerous minute bunches of tracheae. Especially large groups of tracheae 
( tr . tr.) pass to the underside of the intestine and of the pharynx from the 
middle line of the ventral surface. 
Fig. 2. Inner surface of a portion of the ventral and lateral walls of the body spread 
out flat and magnified four times, to show the manner in which the tracheae 
form tree-like appearances. 
