290 



F. F. LAIDLAW. 



In the male apparatus the vasa deferentia open into a muscular vesicula seminalis, 

 resembling in shape that of L. vitrea. From the front end of the vesicula the ductus ejacula- 

 torius runs backwards and downwards for some distance ; its lumen is rather wide and it is 

 lined with glandular prostatic cells, outside which lies a layer of circular muscular fibres. 

 This part of the apparatus resembles rather that of L. pallida than of L. vitrea. The rest 

 of its structure is practically identical with that of L. vitrea. The duct narrows, and runs 

 vertically upwards, then turns downwards and backwards again, extending parallel to the first 

 part of its downward course. It is here very narrow, surrounded by a compact layer of 

 circular fibres, outside which lie less compact, diagonal fibres. It opens finally into the antrum 

 masculinum. These muscles form the penis. 



As this specimen is in an imperfect condition I cannot describe it fully, though I believe 

 it to be quite distinct from any named species. 



III. Family Cestoplanidae. 



5. Cestoplana ? maldivensis, sp. n. 



A single specimen from the reef of Minikoi, Laceadive group. 



Total length about 15 mm., breadth 5 mm. Body flat, anterior end pointed, posterior end 

 tapering a little. Colour (in spirit specimen) uniform dull brown. The 

 hinder end of the body of the single specimen has unfortunately been 

 so much damaged that it is impossible to determine the characters of 

 the sexual organs. 



The pharynx has the position typical for Cestoplana, and the mouth 

 opening is about 4 mm. from the hinder end, whilst the male aperture 

 is certainly not more than 2 mm. from the extremity. 



From the two species of the genus previously known, viz. C. mhro- 

 cincta (Grube) and C. faraglionensis (Lang), the present species is 

 separated by its relatively short and wide body. Another more striking 

 difference is afforded by the arrangement of the eye-spots. In C. mal- 

 divensis there is a complete series of these round the margin of the 

 body (see Fig. 64), on the posterior two-thirds of the body being few 

 and distant, but on the anterior margin on either side as far back as 

 the level of the brain thickly scattered. In addition to these in the 

 apex of the triangular anterior end of the body lie a small number of 

 eyes scattered over an area which stretches back for about half the 

 distance from the apex to the brain ; and further from the middle of 

 the hinder end of this area two irregular parallel lines, each of a single 

 row of eyes, extend back as far as the brain, which lies at about the 

 end of the first sixth of the body. 



The uteri can be traced forward through the hinder two-thirds of 

 the body, and are crowded with eggs. Until it is possible to examine 

 the genital apparatus of this species in a better-preserved specimen I 

 prefer to leave it in the genus Cestoplana, although there can be no 

 doiibt that it differs strikingly from typical members of that genus. 



Fig. 64. Cestoplana (?) 

 maldivensis. x 7. 



