RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. U) 



Remarks. — I found the female only of this species in fifteen out of 

 forty specimens of Helix alternata, in numbers of from one to three. 

 The ovaries in all were distended with ova, the latter measuring 

 I -430th of an inch in length by 1-576 in breadth. 



a. Ascaris infecta . — Female, subcylindrical gradually diminishing 

 toward the extremities, white, with brown streak down the lower 

 two-thirds of the middle line ; anteriorly obtusely rounded ; tail 

 sHghtly curved, i-8oth of an inch long from the anus. The three 

 papillae of the mouth projecting ; oesophagus strongly muscular, 

 thick, oblong, pyriform, i-8oth of an inch long, greatest breadth 

 I- r 75th of an inch ; oesophageal bulb, cordiform, i-i66th of an inch 

 long, by I- 1 66th of an inch broad, ventricle slightly dilated at com- 

 mencement, contracted posteriorly ; generative orifice projecting just 

 below the middle of the body. Vagina furnished with a large ovate 

 seminal receptacle. 



Male, dilated at both extremities ; tail thick, i- 174th of an inch 

 long, furnished upon its inner aspect with two minute tubercles. 

 Above the anus are two rows, each of four tubercles, connected by 

 delicate folds of integument. CEsophagus i-iiith of an inch long, 

 I -260th of an inch broad ; oesophageal bulb depressed cordiform 

 1-2 14th of an inch long, by i- 250th of an inch broad. Penis formed 

 of two curved spiculae, measuring in length in a straight line i-7Sth 

 of an inch. 



Length of adult female 3 to 414 lines ; breadth at origin of ven- 

 triculus I- 1 23d of an inch ; middle of body i-83d to i-6oth of an 

 inch ; just above anus i- 144th of an inch. Ova 1-3 19th of an inch 

 long by I -428th inch broad. 



lycngth of male 2 lines ; breadth at origin of ventriculus i-i76th of 

 an inch ; middle of body 1-2 nth of an inch ; just above anus i-202d 

 of an inch. Spermatophorioval, i- 1391st inch long, by i -1666th inch 

 broad, with spermatozoa i -3750th inch long, by i-iooooth inch 

 broad. 



Habitat. — This species is found in numbers from three to fifty or 

 more, of various ages and sizes, pretty constantly in the small in- 

 testine of Julus marginatus Say. The males are found in the pro- 

 portion of about one in eight. 



Aorurus,'-^' a new genus of Nematoidecr . Body C3'lindrical, strongly 

 annulated, with a tail nearly as long as the body, straight or nearly 

 so, inflexible, spiculate, ensiform, shining, and pointed. Mouth un- 

 armed. Female generative aperture near the middle of the body. 



* Aorurus : — Aop et oopa. 



