RKSEARCHES IN HELMINTHOLOGY AND PARAS1TOI.OGY. 39 



ventriculus moderately dilated at commencement, capacious, cylin- 

 drical ; tail long, narrow, acute. 



Female. — From i line to 2 and i-5th lines in length ; breadth 

 I -266th inch ; first portion of oesophagus i-66th inch long, i -Sooth 

 inch broad ; second portion i -200th inch long by i -666th inch 

 broad ; generative aperture projecting, just anterior to the middle ; 

 tail simple pointed, i-57th inch long from anus, i -400th inch broad 

 at base. 



Ovum oval, white, i-363d inch long, i -666th inch broad. 



Male. — lycngth 4-5ths to 3-5ths of a line ; breadth i -400th inch ; 

 posteriorly recurved ; tail pointed, furnished with five minute epi- 

 dermoid prominences on the inner side, i-i33d inch long from anus ; 

 spiculum of penis single, simple, curved, i -400th inch long. 



Habitation. — Found in numbers of from five to twenty, of which 

 one-fifth are males, in the large intestine of the large black cricket 

 (^Acheta abbreviata) . 



Genus Hystrignathus. — Body cylindrical, anteriorly furnished with 

 transverse rows of simple spines projecting backward ; mouth sur- 

 mounting a large naked papilla ; oesophagus of two portions ; the 

 first long, cylindrical, the second short and pyriform ; annulations 

 indistinct posteriorly ; tail long. 



6. HystrignatJuts Rigidus. — Body straight, rigid, cylindrical, nar- 

 rowed anteriorly and posteriorly, anteriorly furnished with 106 

 transverse rows of simple spines projecting obliquely backward, 

 each row corresponding to an annulation and containing about six- 

 teen spines ; anterior spines longest, equal to the width of the annu- 

 lations, becoming shorter posteriorly and decreasing to mere points ; 

 first annulation of the mouth truncated, conical, smooth ; second 

 annulation smooth ; pharynx extending through the first two annu- 

 lations ; first portion of oesophagus long, cylindrical ; second por- 

 tion with a narrow cylindrical neck and globular body ; ventriculus 

 cylindrical, slightly dilated anteriorly, narrowed anteriorly ; rectum 

 elongated, conical ; tail long, curved ; generative aperture very near 

 the middle of the body. 



Length 2 lines ; greatest breadth i- 140th inch ; tail i-4oth inch 

 long from anus, i-ioooth inch broad at middle ; anterior or spinous 

 portion of body i-26th inch long or one-fourth of the whole length. 

 First portion of oesophagus i-5oth inch long, i -520th inch broad ; 

 second portion i- 190th inch long, 1-3 20th inch broad at body. An- 

 terior spines i -2000th inch long. Fifty-eight spinous annulations 

 corresponding to the first portion of the oesophagus, twelve to the 

 second portion. Annuli posteriorly indistinct. 



