94 DR. COLLINGWOOD ON THIRTY-ONE 



11. Leptoplana aurantiaca, Coll. 



Length - x % inch ; breadth £ inch. 



Body slender, semitransparent, entire. 



Upper surface, general colour orange-chrome, with a median ridge of a pinkish colour. 

 From this ridge radiate a number of minute dendritic processes of a bright chrome- 

 colour, which approach the margin, where the body becomes perfectly translucent. 

 Sparse white spots are scattered irregularly over the general surface. 



Under surface similar to the upper, only paler, as though from the colour being seen 

 through the semitransparent body. 



Head. The anterior portion of the body is without a distinct head or tentacles, but 

 notched, and apparently folded ; on the left side of the notch appeared a tentaculi- 

 form process tipped with a black spot, and having also two or three small black 

 specks in its neighbourhood. 



JjJye-specks in a hippocrepiform congeries immediately anterior to the pink median line ; 

 the spots few, and larger than usual compared with the smallness of the animal. 

 This species moves somewhat slowly, crawling like a slug, and also swims or floats 



upon its back, like the nudibranchs, upon the surface of the water. 



I obtained several specimens between tide-marks under stone westward of Singapore 



Harbour in November. 



Fig. 11. Upper surface of the animal. 



12.' Stylochopsis malayensis, Coll. 



Length 1 \ inch ; breadth f inch. 

 Body smooth, folds ample ; general colour a rich, velvety, deep brownish black, with a 

 narrow border of deep chrome, external to which is a second narrow edge of dull 

 white. 

 Under surface nearly as dark as the upper, with a central irregular line of rose-colour. 

 Tentacles large, separate, anterior, supporting ocelli. 



One specimen found under a coral block on Pulo Barundum, west coast of Borneo, 

 between tide-marks, Oct. 6. 

 Fig. 12. Upper surface of the animal. 



V. 



(Dr. Kelaart's description of his figures of Marine Planarians taken at Ceylon, all of 

 which, except two, he included under the genus Planaria. They are therefore, in 

 this list, referred to their proper genera.) 



Genus Thtsanozoon, Grube. 



13. Thysanozoon auropunctatum, Kel. 

 A large species. 

 Upper surface, a rich violet brown, darker in the centre, and edged all round with a 



