RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 55 



6. AnQ:uUlula Longicauda, u. s. — Body cylindrical, colorless, hya- 

 line ; anteriorly obtusely rounded ; posteriorly attenuated, with a 

 long' delicate, flexible, subulate tail. Mouth without cirri ; oesoph- 

 agus' cylindrical, often with the appearance of a globular bulb at 

 its lower end ; intestine cylindrical ; anus indistinct. Generative 



apparatus ? 



Length I -40th inch ; breadth i-ioooth inch ; length of tail i -200th 

 inch. Smallest: Length i-i6oth inch; breadth i-2oooth inch; 

 length of tail i -Sooth inch. In an individual i-iooth inch long, the 

 oesophagus measured i -570th inch long. 



l^ab —Found with Lvngbya muralis and other confervse about 

 gutters and water spouts in the city of Philadelphia. This species 

 is very active in its movements and appears to have the power of 

 fixing itself by the end of the tail to surrounding objects. 



7. Anguilhda Fossidaris.—^o^y cylindrical, anteriorly narrowed, 

 truncated. Mouth round, surrounded by a prominent circular lip ; 

 buccal apparatus none ; pharynx short ; oesophagus long, clavate, 

 or fusiform, slightly tortuous ; intestine cylindrical, brown in color : 

 rectum distinct, cylindrical, colorless. Tail acute. Ovary double. 

 Generative aperture anterior to the middle. 



Length 2 to 2>^ hues; breadth i-25oth inch. Tail i -80th inch 

 long from anus. CEsophagus i-28th inch long ; 1-333^ inch broad 

 at commencement ; i-40oth inch at termination. Intestine i-475th 

 inch broad. Rectum 1-7 5th nich long. 



//a^.— Stagnant ponds and rain puddles in the suburbs of Phila- 

 delphia. 



ACESTUS, LEIDY. 



Body vermiform. Podal spines in 4 rows ; anteriorly 3 to 5 in 

 each fasciculus, posteriorly in pairs ; long sigmoid, bifurcated at 

 extremity. Upper lip conoidal, inarticulate. Annuli under 100. 

 Blood red. Eyes, girdle and muscular stomach none. 



8. Accstm spiralis, n. s.— Body cylindrical, posteriorly attenuated, 

 obtusely terminated ; color reddish ; integument thick. Annuli 80 ; 

 anterior five with 5 podal spines in each fasciculus, afterwards 3 m 

 each, and posteriorly in pairs ; furnished with a shoulder, and a 

 bifurcate unguiform extremity. CEsophagus passing the sixth 

 annulus. Intestine simple, cylindrical, capacious. Blood vessels 

 large tortuous, without distinct coeca, filled with red blood. 



Length I inch ; breadth anteriorly i-i2th line ; at middle i-ioth 

 line ; posteriorly i-i6th line. Lip i-28oth inch long from mouth. 

 Podal spines i -400th inch long. 



