STUDIES ON BARTHWORMS. 221 
genus Kinberg was dealing with, or indeed what significance is 
to be attributed to Savigny’s Hypogeon. 
In 1869 Baird (26) described a Pericheta (though he 
called it at first Megascolex after Templeton) which he had 
obtained from South Wales, whither it had apparently come 
with exotic plants. 
Pericheta diffringens is 4 to 5 inches long, contains 
104 somites, and has sixty sete to each of them. 
In 1869 Leon Vaillant (24) described two species of Peri- 
cheeta, where the “‘ prostate” is described for the first time. 
One from Java, P. posthuma, is 18 cm. long, consisted of 
100 somites, and has sixty-five to seventy-seven sete in each 
somite. The sete average about °25 mm. in length. It has a 
pair of “ copulatory ” papille on the xvii, and a pair on the x1x 
somite, in line with the male pores. The prostate occupies two 
somites. The spermathece are four in number in the somites 
V, VI, Vil, and Vill, opening in the anterior region; each consists 
of a bilobed sac. Vaillant denies the existence of a gizzard and 
of intestinal ceca, but Perrier has contradicted him as to the 
first point, and regards this worm as the same as the P. 
affinis. 
The other species is P. cingulata, Sch., which came from 
Bourbon. Vaillant’s description does not correspond in some 
points with his figure, and Perrier reserves the name for the 
species figured, whilst he calls the one described P. robusta. P. 
cingulata is 17°4 cm. long, consists of 114 somites, and has 
forty setz in each somite, the length of the sete being °36 mm. 
There are no “copulatory” papille on or near the somite 
carrying the male pore. The prostate occupies only one 
somite. The spermathece have the same position as in P, 
posthuma. 
Apparently Vaillant included other species under the name 
P. cingulata; these Perrier has named and separated from 
this form. 
In his paper Vaillant numbers the somites differently from 
the way in which they are now reckoned. He regards the first 
setigerous somite as the somite I (instead of 11). He also regards 
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