24 



" TERRA NOVA" EXPEDITION. 



In the female the genitalia are very simple. The genital aperture lies 9*8 mm. 

 behind the head. There is a triangular cavity representing the vagina ; the apex of 

 this is the vulva, and from eaeh basal angle there proceeds along the body a straight 

 genital tube. The one which proceeds cephalad terminates in a bluntly rounded end 

 at 3*5 mm. from the oesophageal valves, while the caudad tube ends similarly. 



Mention must lie made of the pair of beautiful ocelli (PI. I, fig. 3, c) which 

 are present on either side of the oesophagus at 0'46 mm. from the head. Each 

 is composed of a number of globules of a deep crimson colour. 



PAKASITIC NEMATODES. 

 Fam. ASCARIDAE. 

 Kathleena* Leip. and Atk. 



KatJdeena, Leiperand Atkinson, Proc. Zool. Soc, 1914, p. 226. Genotype, Ascaris osculata, Rud. 



An Ascarid with three large fleshy lips and three interlabia. The oesophagus has a solid appendage 

 and the intestine has an anterior caecal prolongation. 



In this genus may be placed K. scotti, Ascaris radiata, and A. rectangnla. 



2. Kathleena scotti, Leip. and Atk. (PI. I, figs. 2, 5, 8. Text-fig. 1.) 



KatJdeena scotti, Leiper and Atkinson, Proc. Zool. Soc, 1914, p. 223. 



Whitish firm round worms. Male 15 x 0'9 mm. Female the same size or slightly larger. Interlabia 

 very large, pentagonal. Short curved oesophageal appendage 0 - 2 mm. Intestinal caecum l - 8 mm. 

 Oesophagus 2 - 53 x 0*4 mm. Spicules 3 x 2-7 mm. The tail of the male terminates in a blunt digitate 

 process. 



Host. — Several whitish round worms varying from half to three-quarters of an inch 

 in length were obtained from the intestine of a single specimen of the Mollymauk 

 [Dlomedea melanophrys) killed off the Campbell Islands, Lat. 52° 20' S., Long. 

 107° 30' E. (Stat, 165). 



These worms are typical Ascaridea and show several features in common with 

 Ascaris osculata Rud., A. radiata v. Linst,, and A. rectane/ula v. Linst. of Weddell's 

 Seal. They are accordingly grouped with them in a separate genus, of which A. osculata. 

 Rud. has been designated the type, 



Parasite. — A mature and fairly typical male measures 15 "3 mm. in length, by 

 0'9 mm. in greatest breadth. The jiosterior extremity curves ventrally and tapers to 

 end in a finger-like process. The anterior end is bluntly truncated owing to the 

 presence of three particularly stout interlabia (PI. I, fig. 8, h) in addition to the usual 

 three large fleshy lips (a, a', a") found in all Ascaridae, The female is straight and 

 its posterior end is also digitate. The skin is transversely striated. The interlabia 

 are very large and of pentagonal outline, measuring from base to apex 0"08 mm., and 



* The diagnoses of the new forms collected by the Expedition have been reprinted from the 

 Proceedings of the Zoological Society, with a few merely verbal alterations, by kind permission of the 

 Committee of Publications of the Society. 



