648 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



also by three longitudinal broad bands of brownish red, each edged 

 with black pigments. Though showing such differences in color 

 and also in the feature of the tentacles, the general appearance 

 agrees with that of the example which I have examined. 



Family DIPLOPHARYNGEATIDEA. 



SIMPLICIPLANA, new genus. 



11. SIMPLICIPLANA MARGINATA, new species. 



Plate 2, fig. 11; text fig. 6. 



Only a single individual, which seems to represent a new genus 

 and species, was collected in Tominado Island, Tawi Tawi. in Feb- 

 ruary, holotype, Cat. No. 19105, U.S.N.M. 



The body in life was leaflike in shape and of a strongly frilled 

 outline. The tentacles appeared as two simple folds of the 

 frontal body margin, so that this form seemed to be destitute of 

 them. In the preserved state, however, they are rather distinct. 



The worm in the 

 expanded state had 

 a total length of 25 

 mm. and a breadth of 

 11 mm. 



The ground color of 



Fio. 6. — Arrangement of eyespots in Simpliciplana ,, , , „ 



MARGiNATA. the dorsal surface was 



wax yellow, excepting 

 the extreme margin marked by a narrow greenish- white stripe; just 

 inside this was a broader band of pale olive, grading over inward to 

 the general color. A white band ran along the median line almost 

 throughout the entire length of the body. Slightly behind the ante- 

 rior margin was located a small spot which appeared to represent 

 the position of eyespots in a cluster. The ventral surface was simi- 

 lar in color to the dorsal, excepting the occurrence of an ill-defined 

 greenish cord. 



Distributed on the tentacular flap are numerous small eyespots, 

 which form two irregular groups, as is shown in figure 6. Other 

 eyespots, of somewhat larger size, also occur over the brain in an al- 

 most circular cluster. 



So far as my observation goes, the present species appears to be 

 devoid of any ventral sucking disk. Placed in the anterior third 

 of the body is the unfolded pharynx, which appears to open to the 

 exterior at the middle of its cavity. The main gut trunk gives off 

 numerous lateral branches, the subdivisions of which form a highly 

 anastomosing system. Some interest attaches to the presence of 

 minute gut diverticulae, which arise from the dorsal wall of the main 



