Volume I. September, /cfy/. Number 2. 



ZOOLOGICAL BULLETIN. 



PRELIMINARY NOTES ON DISTOMUM 

 PATELLARE, n. sp. 



MARY M. STURGES. 



FOR the material used in making this description I am 

 indebted to Dr. Whitman, by whom this Distomum was found 

 in the bladder of Triturus (Molge) pyrrhogaster Boie of Japan. 

 The specific name was suggested to Dr. Whitman by Professor 

 Leuckart. 



The total length averages in the living specimen 4.5 mm., 

 and of this the length of the neck forms about two-fifths. The 

 body, which is nearly circular, averages 3 mm. at its widest 

 part and is .4 mm. thick. The ventral sucker is a trifle larger 

 than the oral sucker and averages .65 mm. in width. 



Anatomical. - -The cuticle has no spines, but is covered with 

 small wartlike thickenings among which papillae more conspic- 

 uous in size and shape, the sensory papillae, are irregularly 

 scattered. The sensory papillae average 50 //. apart on the 

 ventral surface and somewhat more on the dorsal, and are 

 largest around and within the borders of the suckers, the body 

 papillae projecting 5 /u, those of the suckers 10 /*, above the 

 level of the cuticle. The cuticle lines the external openings 

 of the various ducts, ceasing where their epithelium begins. 

 Laurer's duct and the excretory vesicle, which have no epithe- 

 lium, are lined throughout by a thin membrane which is con- 



