RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY, 67 



1. Ltimbriculus Spiralis, Leidy. 



Acestiii, spiralis, Leidy : Pr. A. N. S., v, 226. Description from 

 the young ; found in the spring of the year. 



Adult. — :Body very long and deUcate, filiform, cylindrical ; poste- 

 riorly obtusely rounded. Upper lip compressed, conoidal. Annuli 

 over 200. Podal spines in 4 rows, 3 to 5 anteriorly, 2 to 3 posteriorly 

 in each fasciculus, long sigmoid, furcate. Intervals of the viscera 

 distended with globular corpuscles, which, shining through the 

 translucent integument, give the annuli a deep greenish or bluish 

 white opalescent appearance. 



I^ength from i to 3 inches ; breadth from i-8th to i-5tli line. One 

 of three inches in length had 276 annuli. 



Habitation. — In the mud about the roots of Pontedcria cordata, 

 Sagitaria sagitifolia, and Arum virginiciuii, in ditches below Phila- 

 delphia. It is also often found coiled up in a remarkably close knot 

 among the outer decaying petioles of the leaves of the plants just 

 mentioned. Months of August and September. 



2. Lumbriculiis Hyalinus, Leidy. 



Accstus hyalinus, Leidy : Proc. A. N. S., v, 226. Description from 

 the young in the Spring. 



Adult. — Body filiform, red in color, the posterior fifth yellowish, 

 translucent. Upper lip sub-acute. Caudal annulus obtuse. Annuli 

 from 120 to 180. Podal spines in fasciculi of from 3 to 8, furcate. 



Whole length 2 inches, with usually 150 annuli ; breadth ante- 

 riorly I -5th Hne, po.steriorly i-6th line. One of i inch is about i-6th 

 line anteriorly, i-8th of a line posteriorly. 



Habitation. — Found in ditches with the preceding, the anterior 

 two-thirds of the body buried in the mud, with the tail rapidly 

 vibrating like Saenirus or Strephuris. Months of August and 

 September. 



Ch-Etodemus, Genus novum. 



Body cylindroid. Upper lip very large and broad. Podal spines 

 in 4 rows, fasciculate, aristate. Mouth large, inferior ; pharynx 

 capacious, oesophagus cyHndrical ; intestine capacious. Eyes none. 

 Blood colorless. Increasing by segmentation. 



I. Chcrtodemus Panduratus, Leidy. 



Body transparent, colorless. Upper Up panduriform, broader than 

 the body. Podal spines in fascicuH of 4, long sigmoid, aristate, 

 divergent, 1 -666th inch long, commencing with the oral segment. 

 Pharynx oval ; oesophagus narrow, cylindrical ; intestine large, nar- 

 rowing posteriorly. 



