904 J- Staffoed, 



2. Haematoloechus breviplexus n. sp. 



(Fig. 2.) 



This was tlie first species I recognized as different from the 

 preceding one, which. iip to tliat time, nearly two years ago, I took 

 for D. variegatum Rüd. Wlien once noticed, however, it is an easy 

 matter to sort the two species, either while alive, or in alcohol, er 

 mounted. In the lungs of Fiana catesbiana it is not by any means 

 so common as the preceding species, only occasionally a few to be 

 found with a number of the other kind. In about one hundred 

 Worms, taken from a few frogs, I remember once counting about 

 ten that belonged to this species, but one cannot depend upon 

 always obtaining lO^o- This species also occurs in R. virescens 

 Kalm. (the Common Frog, Green Frog). 



In outline it is long-elliptical or long-oblong with narrowing 

 ends — the anterior long-tapering. In size, it is the largest of 

 all five species, both in length and breadth, but not in depth. 

 While alive, it may reach 16 or 18 mm but my longest mounted 

 specimen is 12 mm while most of my preserved adults vary from 

 2 to 2-5 mm in breadth. A sagittal section, through mouth and 

 ventral sucker, measured 9 mm in length and -8 mm in depth and 

 a transverse section, through the region of the ventral sucker of 

 another worm, was 1-75 mm in breadth and Ib mm in depth. 

 Comparing these figures with similar ones for the preceding species, 

 it will be Seen that a longer worm of species No. 2 is but little 

 over half the thickness of No. 1. 



The ventral sucker is on the mid- ventral line, between the first 

 and second thirds of the length of the worm. In both the above 

 mentioned sections it is "16 mm broad and -12 mm deep. The 

 mouth-suckers of the same were of twice these dimensions, which I 

 have also proved from mounted specimens of like size. 



The cuticle of this species is thick but, unlike that of the 

 preceding species, it is beset with numerous, backwardly-projecting 

 spines. 



The ovary is situated just posterior to the ventral sucker and 

 may be on either side. It is very irregulär and .branched, but is. 

 usually, tolerably straight along the side turned towards the median 

 plane, and branched along the side turned outwards towards that 

 side of the body on which it lies. From sections. it is found that 

 the receptaculum seminis lies above the ventral sucker, the shell- 

 gland above this, and the ovary to one side and behind the latter. 



