1907.] OF A FROG OF THE GENUS MEGALOPHRYS. 351 



tainecl within or lie upon the mesovai'inm and thus run towards 

 the median dorsal line of the body, and are partly inserted upon 

 the distal dilated sac in which the oviduct ends (as in Rana &c.), 

 and by which it opens into the cloaca. 



Traced in the opposite direction, the fibres soon lose themselves 

 iipon the ovary. The strand of muscles which is inserted upon 

 the terminal chamber of the oviduct is much the thickest. It 

 was, however, not absolutely accurate to speak of this band of 

 muscular fibres as being inserted upon the dilated posterior 

 chamber of the oviduct. They are really inserted upon a distinct 

 and rather tubular diverticulum of the same, which lies to the 

 inside of the oviduct and naturally points towards the ovary. 

 This diverticulura is certainly totally absent in Rana guppyi, 

 where — considering the size of the Frog — it would be easy to 

 detect were it present. The band of muscles continuing on this 

 diverticulum to the ovary associates it particularly with the gonad. 

 The association might be physiological as well as anatomical. For 

 a swelling of the ovaries would tend to fall upon the diverticulum 

 of the uterus, possibly thus stimulating its growth and that of the 

 uterus at the time when it is required to be large for the reception 

 of the ova. 



On the left side of the body the structure of the various bands 

 of muscle and the diverticulum of the uterus was not absolutely 

 identical. In fact, there was no appearance of a stout band of 

 muscle applied to the diverticulum of the uterus, only fine fibres 

 in the mesovarium. Nor was the diverticulum so conspicuously 

 marked as on the right side. The two uteri join just before they 

 open into the cloaca on a marked papilla by a single orifice, as in 

 some genera. 



The internal orifice of the oviduct in this Frog has a position 

 which differs rather from that of the oviducal aperture of Rana 

 gi(,ppyi. In the latter it is distinctly to the outside of the lung ; 

 in my species it is situated as distinctly to the inside of the lung 

 base. In both cases this funnel-shaped expansion lies upon the 

 lio-ament attaching the liver to the anterior wall of the abdominal 



cavity. 



§ Summary of Principal ]^eio Facts. 



It will be convenient to briefly summarise the chief new facts 

 contained in the preceding pages. They are as follows :— 



(1) The genera of the family Pelobatidse should perhaps be 

 increased by the addition of one for a Bornean species, possibly 

 identical with Megalophrys nasuta (auct.), which difiers from all 

 other genera of that family in certain features. 



(2) This species agrees with Pelobates (? as to other Pelobatidai) 

 and differs from Rana, Ceratoj)hrys, and some other genera, in the 

 great extent of the visceral layer of the transversalis muscle 

 (" diaphragm "), which is attached along a greater length of the 

 pharynx and arises from the transverse processes of several ver- 

 tebras and from the ilium for a long way down, covering over and 



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