No. 9. — 1856-8.] oeylon mabxste sxtozoa. 



m 



Further investigation will, I believe, lead me to separate 

 the species into more than two genera ; the majority of species 

 correspond with M. Duge's Derastoma in which there is one 

 opening, nearer the anterior edge than in Planaria The 

 presence of tentacles, or rudimentary ones, on the anterior 

 edge, or on the back, will also perhaps form a generic 

 distinction. I have attached the species without any appearance 

 of tentacular appendages to a new genus (mihi), Penula, 

 The mouth too in this genus is placed nearer the centre of 

 under part. 



Planaeia cerebealis. Kel. 



Rudimentary tentacles anterior, formed by two folds of the 

 margin. Upper surface of a yellowish-brown colour and 

 minutely streaked with fine wavy brown lines ; border lined 

 with a black line, streaked with white. Beneath, of a beautiful 

 salmon colour. Mouth large, placed on the anterior third of 

 lower part of body ; lips white. 



This is the largest species observed, nearly 3| inches long, 

 and 3 inches broad. Ova greenish-white. 



Planabia violac^a. Kel 



Tentacles, as in last species. Upper surface violet-purple 

 colour, edged with bright-yellow. Median line yellowish ; 

 under parts rose coloured. 



About inch long, and f inch broad. This beautiful 

 species, in a quiescent state, resembles some variety of pansy. 

 Ova yellow. 



Planaria vxridis. Keh 



Tentacles folded ; green, spotted brown ; edge dark grizzly] 

 brown. Under parts paler. 



About 1\ inch long. 



