T. W. KiEK. — On Marine Planarians. 267 



Art. XXXVI. — On some new Marine Planarians. By T. W. Kikk, 

 Assistant in the Colonial Museum. 

 {Read before the Wellington Philosophical Society, 20th August, 1881.] 

 The animals comprising this group are exceedingly interesting. They are 

 usually thin, soft, and delicate ; their varied colours, beautiful leaf-like forms 

 and graceful movements render them attractive ahke to the naturalist and 

 the novice. They are, however, somewhat small, and adhere so closely to 

 the sea-weed and stones amongst which they live as to require not only a 

 sharp but an experienced eye to detect them. 



Most of the members of this section are furnished with a pair of tentacles. 

 In some species these are mere folds or ear-like projections, in dthers they 

 assume the form of true tentacles, situate either occipitally or dor sally. 



The mouth is situate on the under surface, in the median line, but may 

 be either sub-central, pre-central, or post-central. 



The ova may often be mistaken for those of nudibranch molluscs, being 

 usually deposited in flakes on sea- weed, etc. 



It is to be regretted that no preparation has yet been devised for pre- 

 serving these animals without destroying the colouring, which is their chief 

 beauty. 



The two species now described were obtained in the neighbourhood of 

 Wellington, and kept ahve for several weeks. The shores of Cook Strait 

 and Wellington Harbour appear particularly suited to them, and will, when 

 thoroughly examined, probably yield many new and beautiful forms. 



Thysanozoon. 

 Thysanozoon huttoni, sp. nov. 



Body oblong, very thin, margin extremely irregular and puckered. 



XJp-per surface uniform du'ty yellow, irregularly blotched with brown, and 

 having a broad, chocolate-coloured border. 



Under surface steel grey, bordered with black; a broad, somewhat 

 irregular patch of brown extends along the central two-thirds of the median 

 line. 



Head with two long tentacles of chocolate colour, but tipped with yellow. 



Length, 2 inches. 



Lyall Bay. 



EUEYLEPTA. 



Eurylepta herberti, sp. nov. 



Body moderate, veined dendritically, margin much crenated and puckered. 



Upper surface pale cream colour, with a darker brown median stripe 

 running the whole length ; margin white, with an inner border of bright 

 red, and another and narrower one of deep brown, 



