EPEIRA. 233 
The brain over the pharynx supplies the eyes and antenne. A 
nerve-ring round the cesophagus unites it with the ventral nerve-chain. 
The two cords of this chain are widely apart and are connected by cross 
strands. At the hind end they communicate over the intestine. There 
are ninéteen pairs of ganglia upon the cords, supplying the jaws, oral 
papillze and the seventeen pairs of legs. There are seventeen pairs of 
nephridia (and the pair of salivary glands belonging to the segment of 
the oral papillae). Each hasa bladder or vesicle, leading to the exterior 
at the inner base of the leg, a coiled excretory portion and an internal 
nephrostome which opens into a small closed ccelomic space. 
Peripatus breathes by tracheze opening to the exterior by stigmata. 
Their arrangement is indefinite, though some are arranged in rows. 
The sexes are separate. The male organs are a pair of testes lying 
over the stomach, leading to the genital pore by paired vasa deferentia. 
The ovary is unpaired and leads to the.exterior by paired oviducts 
which are swollen to form wert, The development takes place in the 
uterus, hence Peripatus Capens?s is viviparous. 
IV.—EPEIRA. 
PHYLUM _7 ANNULATA (p. 237). 
SuB-PHYLUM mn - ARTHROPODA (p. 240). 
Crass ARACHNIDA (p. 258). 
Fig. 154.—A COMMON GARDEN SPIDER 
(Epetra diademata). 
Resting in the centre of its web. _ Dorsal aspect and about 
natural size. 
Epeira diademata is one of the commonest of our British 
spiders. The figure is about the natural size of the female ; 
