Volume LX. April, 1594. Number 2. 
JOURNAL 
OF 
MORE HOLOG’Y 
SYNCGELIDIUM PELLUCIDUM, A NEW MARINE 
TRICE AD, 
WILLIAM MORTON WHEELER. 
Tue Triclad which I propose to describe in the following 
pages was found in the gill-books of Lzmulus polyphemus. 
My material was collected and in part studied at the Marine 
Biological Laboratory at Wood’s Holl, Mass., during August, 
1892. I gladly seize this opportunity of thanking the director, 
Professor C. O. Whitman, for the many privileges which I 
have enjoyed at the laboratory, and for his continued interest 
in my work. I am also indebted to Professor J. S. Kingsley, 
who has kindly helped me to some of the literature on our 
native Dendroccela. 
THE TRICLADS PARASITIC ON LIMULUS. 
Girard (50) first gave the following brief description of the 
common Triclad parasite of Lzmalus : — 
“ Vortex candida, Girard. Body elongated, tapering away 
towards the posterior extremity;! head rounded ; sides entire ; 
almost transparent, of a pale rose color. From Chelsea beach, 
1 Girard evidently mistakes the head for the tail end, a blunder into which 
Ryder has also fallen. 
