1082 MK. R. J. OIITLEPP ON THE 



Two lateral lips large, eacli carrying three prominent inner 

 median teeth and a somewhat smaller external tooth. Each lip 

 with three external papilla?. 



Length of oesophagus 1*16 mm. ; its muscular part 526 fx long. 

 Nerve I'ing near base of muscular oesophagus. 



Yulva 3*63 mm. from anterior end. Vagina 880 /j, long. 

 Egg-chamber and common trunk together 2* 16 mm. long. 

 Two uteri. Tail blunt and 420 yu, long. 



Host: Ganis familiar is. Duodenum. Michigan. 



Hall and Wigdor suggest that this may be an accidental 

 pai-asite of the Dog. From the remarkable shortness of the 

 oesophagus and tlie relative length of its muscular part, I suggest 

 tliat this Vv'orm is abnormal, which could easily be accounted for 

 if it vvas parasitic in a wrong host. 



(33) Physaloptera tacapensis Seurat, 1917. 



Length of male 15*6 mm., female 22-3 mm. 



Cervical papillse subsymmetrical, at same level as excretory 

 pore immediately behind the muscular oesophagus. External 

 tooth strongly chitinised and truncated ; internal tooth of same 

 height. CEsophagus 1/4 in the male and l/4"6 in female of body- 

 length. Female tail short and conical; male tail conical. 



Vulva immediately in front of end of oesophagus. Yagina 

 2'3 mm. long, egg-chamber 1*02 mm. long ; common trunk absent. 

 Two uteri. Receptaculum seminis yqvj long. Eggs with very 

 thick shell (7 /x) ; 56 ;u. x 30 /x. 



Male caudal bursa with longtitudinal cuticular ornamentations. 

 Character and arrangement of bursal papillae exactly as those in 

 the species described by Seurat (1917 &) as Ph. clausa. 



Right spicule 240 « long, thick, and thimble- shaped ; left 

 spicule 360 /x, long, slenderer, with conical tip. 



Host : Ctenodactyhhs gundi. Stomach. Sud-Tunisien. 



From Seurat's description this species appears to be so closely 

 related to his Ph. clausa that it appears hardly warrantable to 

 separate the two. The similarity of the teeth, shape of spicules, 

 and arrangement of male caudal papilla appear to me to be of 

 far greater weight than the slight differences of the relative 

 positions of the vulva, relative lengths of the oesophagus, lengths 

 of the spicules, positions of the cervical papillae and excretory 

 pore, and the larger egg, all of which difi'erences may verj^ well 

 be due to the fact that the one parasite is about twice the size of 

 the other. In a given species of Physaloptera taken from the 

 same host, the differences in size between one adult and anothei? 

 is often very marked, and consequently there is always a certain 

 amount of difference between the individual specimens. 



(34) Physaloptbka getula Seurat, 1917. 



Length of male 16-3 mm., female 18-5 mm. x 970 /x thick. 

 Body stout, attenuated anteriorly ; cervical papillce sub- 



