346 Tr an sac lions. — Zoology. 



])alatal surface, and similarly the tongue, faucial area, laryn- 

 jj;eal cleft, and larynx generally, were for practical purposes 

 identical with that of the hen compared. On the contrary, in 

 Ocydromus, as in other rails, the slender, lengthened, and 

 laterally-compressed probing tongue and naso-maxillary region 

 gives correspondingly a different facies to these parts, there- 

 fore quite unlike the short, fiat, triangular tongue-j^arts of the 

 fowl tribe. 



The hyoid bones also agreed with those of the fowl. Not 

 only was this the case in the difference of their relative 

 strength to those of rails, but in the short, broad tongue-car- 

 tilage, the stout and broad glossohyal, with its pronouncedly- 

 forked ceratohyals, and in tha proportionally strong, high- 

 ridged anterior basi-branchial bar. 



In Ocydromus the deficiency of bony hyals, rudimentary 

 ceratohyals, and narrow, very elongated cartilage of the tongue, 

 are quite distinctive from those of the preceding. 



.\s to the presence of double carotid arteries in the speci- 

 men, these obtaining both in the rails and fowls,* no infer- 

 ence can be drawn therefrom. 



My dissection of the muscles confirmed gallinaceous struc- 

 ture from the myological standpoint ; but this rather in the 

 general configuration of parts than in variations of individual 

 muscles from those of the Bailidce. As a matter of fact, there 

 are no salient distinctions therein between the two groups. 

 This has been partly shown by the late Professor Garrod in 

 his two papers,! " On certain Muscles of the Thigh of Birds, 

 and on their Value in Classification." 



I may note that in the reputed hybrid in question an 

 ambiens was present in both limbs, that on the left side 

 (agreeing with Garrod's description of that muscle, P.Z.S., 

 1873, p. 629) being inserted in, or, rather, fusing with, the top- 

 jiiost fibres of the flexor digitorum, whereas on the opposite 

 I'ight limb the tendon was lost on the fibrous tissue abreast of 

 the knee-cap, and it did not cross to the outside of the joint. 



On the right side a distinct femoro-caudal was not appre- 

 ciable. On the left side it was represented by a very weak 

 tieshy ribbon, which, as it ran towards the femur, blended hi 

 an undefined pencil of fibres with the insertion of the acces- 

 sory femoro-caudal. The latter muscle, though thin, was a 

 fairly-well-developed sheet on both sides. The pectorales 



* Garrod, " On the Carotid Arteries of Birds," P.Z.S., 1873, pp. 4GS, 



t P.Z.S., 1873, p. G2G ; and P.Z.S., 1874, p. 112. These contributions 

 are based, but with great extensions, on Sundeval's original observations, 

 1843, afterwards worked into his article, " Om muskelbyggnaden i 

 foglarnas extremiter," Nat.-forsk. Sallsk. forhandl., 1851. Garrod adopts 

 Sundeval's nomenclature, which I here follow for convenience' sake. 



