10 Art. 2.— T. Kaburaki : 



it is the margins and posterior end that adhere more firmly to a 

 support; often when tlie animal is forcibly removed from the side 

 of the aquarium, tlie parts of the margin or the posterior end will 

 adliere so firndy to the glass that the points of attachment are d]-awn 

 out into digitate processes. 



Digestive System. — The mouth-opening is situated at about the 

 posterior end of the middle thij-d of the body. Tlie pharynx- 

 insertion lies nt about the centre of the l)ody. Tlie anterior main 

 gut trurds gives off 7-lt pairs of latei-ai branches; while each pos- 

 terior trutdc is usually provided witli lo lateral branches and nbout 

 as many, Init very short, inwanlly directed branches. 



Tlie nervous sytem seems to be in its main features similar to 

 that of the preceding species. 



Genital Organs. — The common genital apeilure lies nearly in 

 the middle of the posterior third of the body. In structural I'es- 

 pects the genital organ are essentially the sanie as in the })reced]ng 

 species. The opening leads ii:i(o the atrium which is an iiregular 

 prolonged space with its wall thrown into folds, and sliows an 

 extensive annular space in front of the junction of the oviduct. 

 The lining epithelium is made up of cuboidal cells, i-esting upon a 

 dehcate basement membrane, beneath which are two layers of 

 circular and longitudinal muscular fibres. 



The small follicular testes lie in abundance mostly dorsal to 

 the end of the lateral gut branches and are arranged in two lateral 

 longitudinal zones running along the lateral margin of tlie body, 

 from behind the ovaries colse to the posterior end of the lujdy. 

 Each testis is, as usual, made up of s]jerm-motlier-cells and spei"- 

 matozoa in several stages of development. 



The vasa deferentia, which proceed backwai'ds inside the 

 longitudinal nerve cords, open into the lumen of the penis sepa- 

 rately^ and without making a turn forwards. The vas deferens 

 is full of spermatozoa. 



The penis is entirely destitute of any sort of intromittent part 

 and is represented by an elongate sack-like organ of muscular 

 nature, which opejis behind into the anterior part of the atrium 

 on thiC floor. Tlie wall is thrown into many folds, projecting into 



