196 38 



Niidibranchiata cladohepatica. 



Fam. Tritoniidae. 



Marionia, Vatss. 



Comp. R. Bergh, I.e. 1892. p. 1069—1070. 



Marionia chloanthes, Bgh. n. sp. 

 PI. II, Figs. 25—27. 



One specimen of this beautiful animal was taken by Dr. Mortensen on March 3 d , 

 1900, at Koh Kram together with Casella atromarginata. 



The specimen had, kept in spirit, a length of 20 mm , by a breadth of the body of 

 up to 7 mm , and a height of up to o^ 1 ™ 1 ; the breadth of the frontal veil was 5 - 5 mm ; the 

 height of the rhinophores together with their sheath was 2 - 25 mm , that of the gill up to 

 3'5 mm ; the breadth of the foot was ?-5 mm , the length of the tail Q'h' mm . — The ground 

 colour was yellowish white with a slight reddish tint, the tubercles of the back were 

 more whitish; the sheath of the rhinophores, as also the stalk of the gill was strongly 

 grass-green; medianly through the whole length of the back, a broad, green stripe, less 

 distinct at the edges, shone through. 



The form was as usual in the genus. The frontal veil was not highly projecting, 

 medianly it was somewhat notched, and had on either side 4 conical papillae, some of 

 which showed tubercles on the lower side; at the outer margin of the veil the common, 

 but not highly developed, spoon-like tentacle was found. The club of the rhinophore was 

 as usual of a form like a sword-knot. The back was flattened , and everywhere (as also 

 the upper side of the frontal veil and the sheaths of the rhinophores) covered with rather 

 close-standing tubercles ; the margin of the back was a little projecting. On either side 

 of the back, and rather regularly arranged, were seen 9 rather strong gills, of somewhat 

 different sizes, the hindmost ones, however, as large as the largest ones. The (green) 

 powerful stem was also mostly divided into 2 — 3 branches above, or had, as was also 

 the case with the branches, small twigs on the sides ; the leaves of these twigs were two 

 or three times pennate. Between these gill- stems here and there single, almost sessile 

 small gills were found. The sides of the body were not low, smooth; the genital 

 aperture as usual ; the anus was found about in the middle of the body. The foot was 

 anteriorly somewhat tapering, rounded, with a rather long, slight, marginal furrow; the 

 foot brim not quite narrow, the tail quite short. 



The intestines were nowhere to be seen from without. 



