Endoparasites. 6 1 3 



Until further luatL'rial is availahU' for t()ini)aris()n, I prefer to 

 regard this as of indeteruiiiied spei-iess, l)iit jirohahly a small 

 agaiuous ('i/liclinostoftium ponihituni. 



Host. — Horse: stomach (and intestines (?) ). 



Locality. Horsham. Victoria : June, ]i)0."5. 



No. 7. — Cylichnostomum calicatum, I>ss., I'.iOl. 



The last of this series of specimens consist of 4 individuals of 

 C ylichnnt<toiniu>i, ."i males and 1 female. Length of males 5.52 

 to 6.06 mm., extreme thickness .21 mm.; female 6.06 mm. long 

 and .24: mm. maximum diameter. Head slightly tapering an- 

 teriorly, but not constricted off from body. Mouth collar 

 slightly flattened, but less so than in C . poculatuiiK set off from 

 rest of head. External leaf-crown consists of 8 to 10 broad parts 

 with rounded tips, which project slightly beyond mouth collar. 

 Submedian head papillae long, with broad bases and tips con- 

 stricted off. Lateral papillae small. Mouth capsule as long as 

 it is wide, cylindrical, with almost straight walls, which are 

 thicker than in C. poculatu/n. Tlie elements of the leaf-crown 

 are short and stout, and project from the anterior margin of the 

 mouth capsule. The dorsal gutter is very long and generally 

 seen projecting nearly to the anterior margin of the buccal 

 capsule. The cervical papillae in one case were between the 

 nerve-ring and excretory pore, as is typical, otherwise all three 

 organs were nearly in the same place. Oesophagus. — This is 

 somewhat disproportionately shorter that the original description 

 gives, viz., .33 mm. in the male and 34 mm. in the female, but 

 the ring-like enlargement of its anterior end is well seen. 

 The maximum thickness of the oesophagus varies from .06 mm. 

 in the male to .078 mm. in the females, its minimum thickness 

 being .03 mm. in the male, and .042 mm. in the females. 



The characters of the bursa in the male show no nuirked 

 difference from the figure given by Looss [loc. cit., pi. ix., fig. 

 117], while all the characters of the head end are in complete 

 agreement Avith both original description and figures. The tail 

 of the female is very short (.06 mm.), pointed, and cut oft' 

 abruptly from the body. Distance of vulva from anus .07 mm. 

 (i.e., shorter in these worms proportionately to their shorter 

 length). ,, 



