393 



SYSTEMATIC NOTES 



The genital organs occur as separate units in both lateral fields of the segment. In some specimens, 

 however, there are three sets of organs on one side, and two on the other. Two parallel furrows run 

 along the strobila, marking the position of the genital organs. The testes are about 120 X 150/A in 

 transverse diameter and are arranged in a single layer. Their number between the right and left genital 

 sets seems to be from about thirty-seven to forty. It seems also that the number of testes occurring in 

 each of the genital sets varies greatly when examined in transverse sections, the left-hand side of the 

 segment may possess a few testes or none, while on the right side sixteen or more testes may occur. The 

 cirrus-sac is about 345x300/*. The vas deferens is well developed and much coiled. The cirrus is 

 fairly large. 



The ovary forms an arch in the ventral half of the segment. The uterus, forming a ' rosette ' is filled 

 with operculate eggs of about 66X48/X in diameter. The egg-shell is 3/x thick. 



The vitelline glands are situated dorsally and ventrally, in the cortical parenchyma, leaving a free 

 field around the genital organs. They are more or less spherical in transverse section. 



LARVAE 



Two types of larval stages have been found in the present material. 



All specimens examined seem to belong to the Genus Phyllobothrium, except one specimen which 

 probably belongs to the Tetraphyllidea. Specific identification is not possible owing to the complete 

 lack of any morphological characters. 



Phyllobothrium (sensu lato) sp. larva. (Fig. 44; PI. XXI, fig. 8.) 

 Hosts: Sperm Whale (Physeter catodon) and (Lagenorhynchus obscurus). 

 Localities : Durban, Simon's Town, South Africa and South Georgia. 



This larval stage is found in cysts in the blubber and may be regarded as a cysticercus. The body 

 is composed of a bladder with an invaginated scolex and neck. The size of the cyst is variable, measuring 

 from 3-20 x 2-9 mm. The scolex is about 2 mm. broad and is similar to that of Phyllobothrium. The 

 evaginated neck is 6 mm. long and 3 mm. wide in the larger specimens. 



Fig. 44. Phyllobothrium sp. from Sperm Whale. 44. larval stage extracted from blubber. 

 Fig. 45. Tetraphyllidean larva from blubber of Sperm Whale. 



