PHILIPPINE POLYCLAD TUEBELLAKIANS. 647 



of Lianga, Mindanao, in May. An examination has revealed that 

 this form may be referred to the genus Prostheceraeus. 



The body in the living state was of a leaflike shape, its margin 

 being frilled to a certain extent. The tentacles were represented by 

 two hornlike projections arising from the anterior margin of the 

 body. When fully extended the animal was 17 mm. in length and 7 

 mm. in breadth. 



The dorsal surface was light buff and margined almost completely 

 by a narrow dark-blue stripe. In addition to this there were, as in 

 Pseudoceros mtbi'otentaculatus already described, three bands of a 

 dark-brown color, a median and a pair of lateral, each bordered by a 

 much deeper color. The median band was wide and extended from 

 behind a group of eyespots over the brain to a point some little dis- 

 tance from the posterior extremity. The lateral pair, which were 

 somewhat narrower and much lighter in color, occupied a position 

 nearly hallway between the median band and the lateral body mar- 

 gin and extended a little 

 farther forward and back- 

 ward. At the base of each 

 tentacle there was a yellow 

 spot. In the preserved 

 state the tenacles show a 



black color at the tip on 



„„«„ „j- £ i.i „ -e Fig. 5. — Arrangement of eyespots in Prosthe- 



account of the presence of CERAEUS MELEAGE1NDS (Ke laart). 



well-developed pigments. 



The ventral surface was, like the dorsal, of a bluish-white color 

 with a dark brownish-blue marginal stripe. The dorsal markings 

 were visible on the outside with more or less distinctness. 



At the base of each tentacle are numerous small eyespots, which 

 assume an irregular group on both sides, dorsal and ventral, and they 

 also occur in a horseshoe-shaped cluster above the brain. 



The position of the mouth could not be detected, since the speci- 

 men was unfortunately in a state unfit for close examination. Lying 

 in the anterior half of the body is the pharynx, which is of smaller 

 size. Along the median line runs the main trunk of the intestine 

 with numerous lateral branches, the subdivisions of which form a 

 highly anastomosing system before reaching the margin of the 

 body. The ventral sucker is placed at a short distance behind the 

 middle of the body. 



According to Collingwood's description and figures, Kelaart's orig- 

 inal form is provided with a pair of linear appendages on the occip- 

 ital region above the eyespots. The ground color, which is white in 

 the central and light blue in the marginal parts of the body, is 

 marked almost completely by a narrow black marginal stripe and 



