BY H. A. BAYLIS. 309 



material had been placed. A single cervical ala is present, on 

 the left side, but it is narrow and feeble-developed as compared 

 with that of the genotype. S. armatiis. The tail of the male 

 has a preanal row of claw-like cuticular structures, arranged in 

 a horseshoe, with the arms of the horseshoe directed posteriorly 

 but not extending behind the anus. These structures are less 

 prominent than in S. nrDiatit.s, being apparently cuticular 

 papillae of the same kind as those covering the general ventral 

 surface of the caudal region, but more highly developed. 

 The writer (19'i3) has given a summary of the characters 

 of the known species of this genus, and it was there 

 remarked that von Linstow describes and figures five pairs of 

 preanal papillae in the male of S. pigmentatus. The fifth 

 pair, close to the anus, though counted in von Linstow's text 

 as one of the pairs of stalked papillae, is figured as sessile. 

 This pair of papillae, which does not appear to exist in other 

 species of the genus, has not been in the material now under 

 discussion, and it may perhaps be doubted whether it was 

 present in von Linstow's specimens. 



Subfamily Physalopterinae. 



Physaloptera Rudolphi, 1819. 

 Physaloptera mydai, sp. n. (Figs. 4 — 6). 



Host : Mydaus sp. (Bornean badger ">. Position : stomach. 

 Locality : Kalabit country. 



This is a stoutish form much resembling the genotype. P. 

 clansa, in general appearance. The largest male and female 

 measure roughly 30 mm. and 50 mm. in length respectively, 

 with maximum thickness of about 1.2 mm. and 2 mm. or a 

 little over. The distance from the anterior extremity of the 

 head to the posterior end of the oesophagus is 5—6.4 mm., 

 and from the same point to the end of the narrower anterior 

 portion of the oesophagus 0.85—0.9 mm. The cer^ncal 

 papillae are situated at 0.7 mm., the nerve-ring at 0.6 mm.. 

 and the excretory pore at 0.85—0.9 mm., from the anterior 

 end. The cuticle is transversely striated at intervals of about 

 0.002 mm. in the male and 0.004 mm. in the female. In 

 addition to the striations there is a tendencv for the cuticle to 

 exhibit many deep transverse wrinkles. The lips are lar?e. 

 rounded externallv and obtuse in front. The external surface 



