230 [Oct. 



muscular, thick, oblong, pyriform, l-80th of an inch long, greatest breadth l-175th 

 of an inch; oesophageal bulb, cordiform, 1- 166th of an inch long, by 1-1 66th of an 

 inch broad; ventricle slitrhtly dilated at commencement, contracted posteriorly; 

 generative orifice projecting, just below the middle of the body. Vagina fur- 

 nished with a large ovate seminal receptacle. 



Male, dilated at both extremities ; tail thick, l-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 

 l-Ulth of an inch long, by l-260lh of an inch broad ; oesophageal bulb depressed 

 cordiform l-214th of an inch long, by l-250th of an inch broad. Penis formed of 

 two curved spiculae, measuring in length, in a straight line, l-78th of an inch. 



Length of adult female, 3 to 4i lines; breadth at origin of ventriculus l-123d 

 of an inch ; middle of body l-80d to l-60th of an inch ; just above anus l-144th 

 of an inch. Ova l-319th of an inch long, by l-428th inch broad. 



Length of male 2 lines; breadth at origin of ventriculus l-176th of an inch; 

 middle of body 1-21 1th of an inch; just above anus l-202d of an inch. Sperma- 

 to^hori oval. 1-1391 inch long, by l-1666th inch broad, with spermatozoa l-3750th 

 inch long, by l-10,000th inch broad. 



Habitat. — This species is found in numbers of from three up to fifty or more, 

 of various ages and sizes, pretty constantly in the snnall intestine of Julus margina- 

 tus Say. The males are found in the proportion of about one in eight. 



Aorurus,* a nrw genus of Nematoidex. Body cylindrical, strongly annu- 

 lated with a tail nearly as long as the body, straight, or nearly so, inflexible, 

 spiculate, ensiform, shining, and pointed. Mouth unarmed. Female generative 

 aperture near the middle of the body. 



Remarks. — This genus is divisible, by several well marked characters, into 

 two distinct sub-genera. 



\ft sub-grnus. Strepio.itoma.f — Body cylindrical, very strongly marked with 

 broad annuli. Mouth moderately large, round, bordered by a collar, (formed by 

 the second annulus projecting beyond the general outline of the body.) Olso- 

 phagus divided into two distinct pyriform muscular bulbs, with a small interme- 

 diate rounded bulb. Tail four-fifths the length of the body. 



Streptosloma agile. Female. — Body larvaform, cylindrical, narrowed anteri- 

 orly and posteriorly, opalescent white, divided into from sixty-one to eighty-eight 

 broad annulations, of which there are twenty-one from the mouth to the com- 

 mencement of the ventriculus. Tail very straight, occasionally slightly sigmoid, 

 or bent at the point, narrow and sharply pointed, inflexible and brittle. Mouth 

 moderately large, round, projecting; pharynx almost null; oesophagus consisting 

 of three bulbs : the first elongated pyriform, strongly muscular, measuring l-197th 

 in. long, by l-319th in. broad ; second bulb small, rounded, muscular, l-882d in. 

 long, by l-SS2d in. broad; third, or true oesophageal bulb, pyriform, l-294th in. 

 long by l-312th in. broad. Ventriculus dilated at commencement to nearly the 

 diameter of the body, afterwards straight and cylindrical to near its termination, 

 where it is slightly dilated. Rectum elongated, pyriform. Generative aperture 



*A«>p *' ovpo. t Srpinroj ct gtofia. 



