Miscellaneous. S15 
Hab. This species is found in numbers of from three up to fifty or 
more, of various ages and sizes, pretty constantly in the small intes- 
tine of Julus mai -ginatus, Say. ‘The males are found in the propor- 
tion of about one in eight. 
Aorurus, a new genus of Nematoidee.—Body cylindrical, 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. 
Remarks.—This genus is divisible, by several well-marked cha- 
racters, into two distinct subgenera. 
sé subgenus. Streptostoma.—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). Csophagus divided into two distinct 
pyriform muscular bulbs, with a small intermediate rounded bulb. 
Tail four-fifths the length of the body. 
Streptostoma agile. Female.-—Body larviform, cylindrical, nar- 
rowed anteriorly 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 commencement 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; cesophagus consisting 
of three bulbs : the first elongated pyriform, strongly muscular, mea- 
suring 1-197th im. long by 1-319th in. broad; second bulb small, 
padoa. muscular, 1-882nd in. long by 1 -882nd i in. broad ; third, or 
true cesophageal bulb, pyriform, 1-294th in. long by 1-312th in. 
broad. Ventriculus dilated at commencement to nearly the diameter 
of the body, afterwards straight and cylindrical to near its termina- 
tion, where it is slightly dilated. Rectum elongated, pyriform. 
Generative aperture situated about twenty-four rings above the anal 
aperture, which latter is placed between the last nee annuli of the 
body. Ovary double; ova 1-333rd in. long by 1-400th in. broad. 
Length of body front 1-13th to 1-11th nich breadth at commence- 
ment of yentriculus 1-118th inch; at middle of body 1-97th inch. 
Tail from 1-16th to 1-15th inch long, by 1-888th in. broad at its 
middle. 
2nd subgenus. Thelastoma.—Body cylindrical, attenuated an- 
teriorly, strongly marked with moderately broad annuli. Mouth 
small, opening at the extremity of a small papilla. Csophagus 
divided into two distinct portions, the first long and cylindrical, the 
second constituting the true cesophageal bulb. Tail more than half 
the length of the body. 
Thelastoma attenuatum. Female.—Body attenuated anteriorly to 
commencement of the ventriculus, opalescent white, divided into from 
140 to 160 annulations, of which there are from fifty-two to fifty- 
seven from the mouth to the commencement of the ventriculus. 
Tail very straight, or very slightly curved or bent, slender, inflexible 
and brittle, and sharply pointed. Mouth always projected, small, 
surmounting a small papillary elevation formed by the first annulus 
