no RESKARCHKS IN HRLMINTHOI.OGY AXD PARASITOLOGY. 



river, and was interesting from its being more nearly allied to marine 

 forms than any other known fresh-water species. It lives in tubes 

 of mud, and is about a line in length. The body is divided into 

 twelve annuli, including the head, which is cup-shaped; has two 

 eyes, and supports on each side a process provided with seventeen 

 cylindrical ciliated arms. The rings, except the head, are provided 

 with four rows of bristles and two rows of podal hooks. The bris- 

 tles are from four to six in a bunch, those anteriorly having a fal- 

 cate extremity and those posteriorly being whip-like. The anterior 

 hooks are in a series of five, and have a long handle with a lance- 

 like extremity. The posterior hooks are from fifteen to twenty in 

 a series, and have a long handle with the extremity expanded and 

 serrated on one side. It appears to be most nearly allied to the 

 marine genus Fabricia. He proposed for it the name Manaynnkia 

 spcciosa, from the Indian name of the river in which it was first 

 discovered. 



[April, 1858. No. 198. See Bibliography.] 



CONTRIBUTIONS TO HELMINTHOLOGY. 



CotyIaiipis,\^€\diy. Body curved infundibuliform, anteriorly cylin- 

 dro-conical, posteriorly expanding into a subcircular or oval ventral 

 disk, with numerous acetabula arranged in a triple series. Mouth 

 infero-terminal, with a prominent upper lip, and protractile into a 

 cup- or disk-like acetabulum. Intestinal apparatus as in Aspido- 

 gaster. Eyes two, distinct, black, situated on each side of the head. 

 Generative apertures inferior, between the head and the ventral 

 disk. 



Cotylaspis bisignis, Leidy. Proc. Nat. Sc, 1857, iS. 



Translucent white or pink white. Upper lip snout-like, conical. 

 \'entral disk crenate at the margin ; acetabula 29, oblong quadrate, 

 the outer rows continuous in front and behind so as to form a circle. 

 Length from Yz to i line ; ventral di.sk from i-4th to >-< a line in 

 diameter. 



Habitation. — Found adhering to the outer surface of the renal 

 organ and the upper margin of the foot, within the cleft of the 

 upper branchial cavity of Anodonta Jtuviatilis and A. laciistris. 



Remarks. — This curious parasite, though allied to Aspidogastcr 

 concliicola, is certainly distinct ; and it never occupies the locality of 

 the latter, which also is found in the pericardium of A)iodonta 

 ftuviafiln and . /. lacustris. It is an interesting fact that in accord- 



