Ascarid from the Sperm-whale. 



215 



to about the level of the posterior end of the uterine branches 

 (see fig. 3). The length of the entire organ is rather more 

 than one-third of the total length of the body. 



The tail of the male measures about 0*45 mm. in length 

 and tapers rapidly to a conical point. The cuticle near the 

 caudal end is slightly expanded and dorso-ventrally flattened 

 at the sides. The cloaca opens into a deep longitudinal 

 depression in the cuticle (fig. 4^ c). The spicules are unequal 

 in length, but both very short. The right spicule measures 

 0*35 mm. and is straight ; the left measures 0*4 mm. and is 



Fio-. 4. 



Anisakis physeteris. Caudal end of male ; ventral view. 

 c, edge of cloacal depression ; L, left, and r., right spicule. 



slightly curved. The caudal papillae (fig. 4) are irregularly 

 arranged, and there is no clear distinction between the post- 

 anal and preanal series. Near the extremity of the tail there 

 are four pairs arranged in a fairly regular series. In front of 

 these, and separated from the most anterior of them by a 

 considerable space, there is a pair of double papilla situated 

 on the folds of cuticle forming the lateral walls of the cloacal 

 depression. Anteriorly to these, at the level of the widest 

 part of the cloacal depression, is a pair of simple papillaB. 



