SPECIES OF MARINE PLANARIANS. 97 



This was the largest specimen observed. Its colour and the ample foldings of the 

 margin call to mind the appearance of convoluted brain-substance. 

 Fig. 24. Upper surface. 



25. Eurylepta striata, Kel. 



Length Z\ inches. 

 Upper surface brownish purple, streaked with brown ; marginal folds ample, and edged 



with a narrow border of dark brown. 

 Under surface pale orange-brown, darker towards the margin, and edged with a narrow 



border of brown. 

 Fig. 25. Upper surface. 



26. Eurylepta zeylanica, Kel. 



Length 2\ inches ; breadth 1 J inch. 

 Upper surface dark purplish chocolate-brown ; margin crenated, white, with an inner 



border of orange, and another thin one of black. 

 Under surface paler. 

 Ova white. 



Apparently allied to Eurylepta interrupta, Stimp. (Proc. Ac. Sc. Phil. 1857, p. 26). — 

 C. C. 

 Fig. 26. Upper surface. 



Genus Centrostomum, Dies. 



27. Centrostomum ocellatum, Kel. 

 Length 2 inches. 



Animal gelatinous. 



Upper surface pale yellowish brown, with dark brown ocellated spots. 



Under surface pale buff. 



Tentacles none. 



Mouth near the centre. 



Eye-spots occipital. 



Ova white. 



Of this and the next species Dr. Kelaart made a new genus, which he called Penula, 

 the principal character of which was the absence of any form of tentacles. But this 

 character is not that of a genus, but of a subtribe, called by Diesing Aceridea ; and the 

 families Typhloleptidse, Leptoplanidse, &c. are therein included. — C. C. 

 Fig. 27. Upper surface. 



28. Centrostomum punctatum, Kel. 

 Length If inch. 



Upper surface white, shaded and minutely punctated with reddish brown. 

 Under surface very delicate white, clouded with faint reddish brown. 

 Fig. 28. Upper surface. 



These two species (particularly the first) seem to bear a great resemblance to the Pla- 

 naria gigas, from the Red Sea, figured in Ruppell's Atlas, t. 3. f. 5. — C. C. 



