906 J- Staffobd, 



3. HaeniatoloecJius varioplexus n. sp. 



(Fig. 3.) 



This species also occurs in Rana cateshiana. I liave obtained it 

 in Toronto and in Montreal, but I find that I have only few mounted 

 specimens and imperfect notes; consequently I slmll not describe it 

 at length but trust to the drawing to illustrate its chief cliaracte- 

 ristics; I sliall be glad to come upon it in numbers for greater as- 

 surance as to its Claims for specific distinction. It rivals No. 2 in 

 size, my largest mounted specimen being- 10"5 mm in length and 

 2 mm in breadth. It also resembles No. 2 in sliape, the spines of 

 its integument, its vitellaria, and the distribution and foldings of its 

 Uterus; of these the spines and the Uterus are the only things that 

 can be considered of great importance. On the other band, this 

 worm has a more compact ovary, small, rounded, or short, elliptical 

 testes some distance apart, and larger eggs (-029 mm x "018 mm). 



This species appears to be dosest related to Haematoloechus 

 variegatus as described by Looss; the resemblance is chiefly in size 

 and shape, shape of ovary, shape and position of testes, and size of 

 %gg. It diifers, however, in having spines in the skin, the ^gg being 

 rather broader and of a more accurate ellipse with equal ends, and 

 in the disposition of the uterus-folds. With regard to the last 

 point, the lateral loops are much shorter and the median parts very 

 much more folded. I cannot regard this as due to difference of age 

 for the worm figured by Looss was 13 "6 mm in length and con- 

 sequently not far from the largest adult size as given by him 

 (16 to 18 mm). Considering that the comparatively straight, median 

 part of the uterus might have become slightly longer and more 

 folded with further growth of the animal, then it must also be 

 admitted that the lateral folds would correspondingly lengthen which 

 would increase the diff'erence, as compared with the worm I have 

 figured. A mounted specimen of this species, nearly 5 mm in length, 

 diifers from the adult but little; the lateral folds of the uterus are 

 slightly shorter in proportion but the ^gg has the normal measurements 

 (• 029 X ■ 018 mm), which is, perhaps, the surest distinction from the 

 young of other species. Another point to be noted is that this worm 

 occurs in an American species of frog. 



