NEMATODA 



SSI 



Sub-family Thelaziinae 



Spinitectus guntheri, sp. n. 



(Figs. 7-9) 



One male, three mature and two immature females of this form were found among a 



haul of fishes from a depth of loco metres at Station 86, off South-west Africa, June 24, 



O 



B. 



Fig. 7. Spinitectus guntheri. Anterior end of female: A, lateral view; 



5, dorsal view. 



1926. It is probable that, as often happens with fishes brought to the surface from 

 considerable depths, some of them 

 had been so badly damaged as to 

 allow the parasites to escape. It is 

 unfortunately impossible to state 

 from what species of fish they came. 

 The length of the male is 17-75 

 mm., that of the mature females 

 varying between 19-8 and 23-3 mm. 

 The body is slender in the oeso- 

 phageal region, and much stouter On 

 in the posterior region, which con- ^ 

 tains the genital organs. The maxi- 

 mum thickness in the male (near the 

 posterior end of the body) is 0-29 

 mm., in the female 0-45-0-5 mm. 

 The oesophagus has an anterior, 

 muscular portion which is usually 

 much contracted and sinuous, and 



measures about I-I -5 mm. in length. Fig. 8. Spinitectus guntheri. Posterior end of male, lateral 



and a long, granular, posterior view. /., left spicule; r., right spicule. 



portion. The total length of the oesophagus is 6-8-i mm. The cuticular striations are 



