CANTON, ON PARASITIC OVA. 



41 



this may be regarded as the suctorial portion. The body is 

 a simple sac^ entirely destitute of internal organs. 



Si::e. — For the convenience merely of stating the following 

 measurements, I may refer to the different parts of an ovum 

 head, neck, body, and tail. Some of the ova are rather 



as 



smaller than others^ but the annexed has reference to one of 

 larger and more ordinary dimensions : 



Total length 



Length of neck . . . . 

 body . . . . 

 „ tail . , . . 



Breadth of head 

 Neck a little below this 



,, at origin from body 

 Body at its widest part . 

 Tail 



at origin 



Inch. 



0132 



0054 



0056 



0032 



00015 



0001 



0005 



0023 



0003 



Colour. — The colour of all the ova is yellowish ; or^ per- 

 haps^ it may more correctly be said to be a light^ ochreish- 

 yellow ; this tint pervades uniformly every part. 



Consistence. — The chitinous shell-membrane appears to be 

 tough and resistant ; for when^ in examination^ an ovum has 

 been irregularly compressed, it is thrown into large and 

 sharply-angled folds, — no fine wrinkling is to be observed. 



Aggregation. — The ova are commonly found to be solitary 

 or in pairs ; more rarely are they gregarious ; but when in 



VOL. I. 



-NEW SER. 



X> 



