STRUCTURE OP UROCMTA AND DICHOGASTER. 
253 
that each gizzard occupies two segments. The presence of 
more than a single gizzard is not new among Earthworms ; 
Digaster, Perrier (24), and Didymogaster, Fletcher (16), 
as their names imply, have two gizzards, but the present genus 
cannot be confounded with any of these ; more than two 
gizzards occur in other Lumhricidae, viz. Trigaster (Benham) 
and Moniligaster (Perrier). 
The oesophagus is furnished behind the gizzard with cal- 
ciferous glands; of these there are three pairs, situated in 
segments 15, 16, and 17 respectively (fig. 21) ; the two anterior 
pairs of these glands are rather larger than the posterior 
pair and in the specimen studied by me were full of cal- 
careous particles, the product of their activity, which were 
entirely absent from the smaller pair ; the oesophagus contained 
a large quantity of the calcareous secretion of the calciferous 
glands. 
The posterior pair of calciferous glands is divided by longi- 
tudinal furrows into four distinct lobes ; its blood supply is 
derived direct from the dorsal vessel, there being apparently 
no supra-intestinal trunk; the blood-vessel enters the gland 
along the short pedicle, which unites it with the walls of the 
oesophagus. The same appears to be the case with the two 
anterior pairs, and in all the glands the vascular supply is 
also in connection with the blood sinus of the oesophageal 
walls. 
§ Generative Organs. 
Testes and Vesiculse Seminales. — I have only been able 
to study these structures by means of transverse sections ; by 
dissection I could not, owing to the friable condition of the 
specimen, make out the exact relationship between the com- 
ponent parts of the male generative organs. 
The testes (fig. 15, t.) are two pairs of small glands situated 
in segments 10 and 11. The organ is somewhat irregular in 
shape, and furnished with numerous finger-shaped processes. 
A dissection even of the immature example which I studied by 
transverse sections would not have shown the testes, inasmuch 
