4 Laidlaw, Marine Turbellaria from Torres Straits. 



Sub-Order A COT Y LEA. 

 Family PLANOCERID.E. 

 Flanocera, sp. 

 One specimen from 15-20 fathoms between Dauer and 

 Murray Island, January 6th, 1889. 



Unfortunately this specimen is too immature to permit 

 of the structure of the genital apparatus being satisfactorily 

 studied. Consequently, although I can scarcely doubt 

 that it is a new species, I do not venture to describe it. 

 So far as I have been able to judge, it belongs to the 

 genus Planocera. There are seven pairs of gut branches ; 

 the total length is about 16 mm. and breadth 9 mm. ; 

 the mouth opening is in the middle of the body. 



Paraplanocera, gen. nov. 



Closely allied to Planocera, differing in the following 

 particulars : — Male genital apparatus with a pair of 

 vesiculae seminales, penis long, coiled, cylindrical, its 

 lumen lined with small, rather distant chitinous spines. 

 In connection with the female organs a thin- walled sac 

 runs back from the vagina and appears to function as a 

 receptaculum seminis. Another sac, with muscular walls, 

 runs forward from the antrum femininum, alongside the 

 penis ; this is the bursa copulatrix. 



Type. — Paraplanocera langii (Laidlaw). 



Paraplanocera Rotumanensis, sp. n. 

 Two specimens from Rotuma. 

 Total length about - - - 25 mm. 



„ breadth „ - - - 15 „ 

 Mouth opening from anterior end 1 5 „ 

 Tentacles „ „ „ 8 „ about i mm. apart. 



(? aperture from mouth - - 3 » 

 ? „ „ male - -1-5 „ 



