Entozoa from the Murman Coast. 503 
side of the segment and down on either side of the female 
organs. The ovary consists of a double rosette of lobes, 
symmetrically arranged in the middle of the segment. It is 
transversely elongated, and measures 0°35 mm. across. ‘The 
yolk-gland is compact and lies in front of the ovary, exactly 
in the middle line. The shell-gland lies behind the ovary, a 
Tetrabothrius intrepidus ; the scolex. 
A., auricular appendage; P., apical papilla; S., sucker. 
Tetrabothrius intrepidus ; horizontal section through a mature segment, 
Cl., genital cloaca; C.S., cirrus-sac ; £., longitudinal excretory canal ; 
Ov., ovary; T., T., testes; V., yolk-gland. 
little towards the pore side. In gravid segments the uterus 
forms an irregular sac. 
Both dorsal and ventral excretory vessels are present, but 
there appear to be no transverse vessels. The longitudinal 
musculature is powerfully developed, consisting of more than 
33* 
