84 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



humus-like substance of the diseased Calanthe, only one 

 single male specimen was observed by me. The tail (PL V. 

 fig. 2 d) is not completely enveloped by the bursa, but its 

 extremity seemed to be broken off, so that the terminal 

 part perhaps afterwards will prove to be longer. The 

 exact number of the ribs or papillae remained also uncer- 

 tain. Immediately posterior to the anus lies a rib, that 

 seems to reach the margin of the bursa, when the latter 

 is looked at in the usual lateral position ; the second and 

 third rib, the latter of which seemed to reach the margin, 

 the former not, are situated close together at some distance 

 from the first. The fourth rib, which reaches the margin, 

 lies as far distant from the third as the third from the 

 first ; and, finally, two or three ribs were still observed 

 near the posterior end of the bursa. The bursa is thus 

 doubtless supported by at least six or seven ribs, but it 

 remained uncertain whether there are also preanal ribs. 

 As I have already observed, the body is a little broader 

 opposite the anus than in the female. The slightly 

 arcuate spicula are 27 ^ long, their proximal ends are 

 capitate, and they seemed to narrow to an acute point. 

 The lamelliform accessory piece is not yet half as long as 

 the spicula, measuring 11 /*. The blind end. of the genital 

 tube is reflexed : the distance between the posterior end 

 of the oesophagus and the flexure measures about one- 

 third of the length of the intestine. 



The vulva is constantly situated slightly posterior to 

 the middle of the body. The two branches of the sexual 

 apparatus, on either side of the vagina, have about the 

 same length, and extend respectively along two-thirds of 

 the distance between the vulva and the posterior bulb of 

 the oesophagus, and of that between the vulva and the 

 anus. 



Innumerable eggs were observed lying free in the 



