1046 MR. R. J. ORTLEPP ON THE 



(16) Physaloptera malayensis, sp. n. (Text-fig. 23.) 



In external appearance this species appears to be identical 

 with Ph. j)'>'c&l^utialis v. L., with which species it was at first 

 confused. This applies especially to the female, where there is a 

 corresponding similarity in the genitalia. 



The cviticle is ve3'y slightly reflected over the base of the lips, 

 and in most cases the lips are quite naked. The cervical papillae 

 are situated about 130 /i behind the level of the hind end of the 

 muscular CBSophagus, and the excretory pore is found abovit 100 /n 

 further back. 



The lips are rounded, and each bears a large triangular and 

 slightly recurved outer tooth, internal to which is the foliaceous 

 and tripartite inner tooth of equal height. 



The oesophagus forms l/5th in the male and l/6th in the 

 female of the total length ; its anterior muscular part, which is 

 encircled in its posterior third by the nerve ring, is slightly 

 thinner than the following part, and forms nearly 1/lOth in the 

 female and l/7th in the male of the total organ. 



Female. 



Mature females vary in length from 29 to 38 mm., with 

 breadth of from 1"6 to 2-1 m_m. The body is attenuated in its 

 anterior third, but posteriorly, because of the looseness of the 

 cuticle and its reflection over the tail, there appears to be only a 

 very slight thinning. 



The vulva opens on a slight bulging, and is situated far back, 

 just in front of the middle of the body ; its position divides the 

 body in the ratio of 1 : 1"2 to 1 : 1*5. Externally the position 

 of the vulva is indicated by a dark chitinous and detachable band 

 encircling the body. The vulva leads into a vagina, which pro- 

 gressively thickens posteriorly to join a progressively thickening 

 egg-chamber; at its vulvular end the vagina is 100 ju thick, at 

 its posterior end it is 200 /x thick, and the hind end of the egg- 

 chamber is 330 jLt in diameter ; the whole organ is straight, and 

 measures a,bout 3'3 mm. long. From the basal end of this organ, 

 the two uteri take their origin like two horns in the same 

 mariner as in Ph. prceputialis. 



The eggs are small, thick-shelled, and only slightly ovoid ; 

 they are 35 /x long by 28 to 32 /x broad. 



Mccle. 



The males are attenuated in their anterior half, and have in 

 most cases the cuticle completely reflected over the tail end ; 

 they average in length from 18 to 21 mm., with a maximum 

 breadth of 0'9 to 1-2 mm. 



In consequence of the cuticle being reflected over the tail, the 

 b)ursal expansions are irregularly folded over the ventral surface; 

 they a.re supported by the usual four pairs of circumcloacal 

 stalked papillas. The whole of the ventral surface is tra,versed 

 by Avell- marked and unbroken longitudinal ridges running more 

 or less parallel to each other. The three pre-anal ventral papillae 



