THE SKULL OF CHIM.EHA. 137 



of the subepiilermul membrane, and apparently all perforate the 

 inner layer of that membrane and terminate in ampnllse that lie 

 internal to it, in the region between the dorsal and lateral rostral 

 processes. The tissues were, howev^er, here so dense and tougli 

 tliat the relations of all of tliese ainp;dla3 to the membrane could 

 not be definitely determined. 



The aip.pnllaj above describeil are all innervated by branches of 

 the ramus ophthalmicus superlicialis trigemini, these branches 

 being all given off after that nerve issues from the ethmoidal 

 canal through its anterior opening, the branches destined to the 

 ampullae that lie between the two layers of the snbepidermal 

 membrane all perforating the inner layer of that membrane to 

 reach the ampulla?. These ampullae correspond, in position, to 

 the larger one of the two supraorbital groups of Cole's (1896) 

 descriptions of Chimcera monstrosa, the smaller group of supra- 

 orbital pores of that author's descriptions having approximately 

 the position, in Chimcera colliei, of a group of ampullar that are 

 innei'vated by the nervus buccalis. 



Cole says (1896, p. 655) that the ramus oticus facialis supplies 

 " the most ventiul of the ampnllfe opening on the surface by the 

 large occipital pores." No such branches of the ramus oticus 

 -could be found in my specimens of Chimcera colliei, and as the 

 ampulhe related to these occipital pores all lie on the dorsal surface 

 of the snout, at a great distance not only from the related pores 

 but also from the branches of the oticus shown in Cole's figure, 

 this would seem to be an error. 



The bucca,lis ampullae ai-e found in three groups, two inner- 

 vated by the inner buccal nerve of Cole's descriptions and one 

 l)y the outer buccal. The dorsal group of inner buccalis ampullaj 

 lies on the dorsal surface of the snout, internal to, or slightly 

 posterior to, the occipital and supraorbital groups of ophthal- 

 micus ampullfe, and, like those ampullae, between the two layers 

 of the subepidermal membrane, these ampullae having approxi- 

 mately the position of the posterior group of supraorbital ampuUse 

 of Cole's descriptions. The tubules of these ampullfe run 

 postero-ventrally, internal to the ophthalmicus ampullae and 

 tubules and between the two layei's of the subepidermal mem- 

 brane, and with one exception they all open on the external 

 surface in the space included between the latero-sensory canals 

 innervated by the inner and outer buccalis nerves of Cole's 

 descriptions, the former cnnal being the one to which I have 

 above referred as the suborbital canal. Nine of these pores forin 

 a sub-group which lies in the dorso-posterior corner of that space, 

 while one of them opens somewhat ventro- anterior to that sub- 

 group ; and associated with the tubules of these pores there is 

 the one exceptional tubule, which opens by an isolated pore that 

 lies posterior to the posterior hyomandibular latero-sensory 

 canal of Cole's descriptions. A second sub-group, of seven large 

 pores, lies immediately ventral to the inner buccalis suborbital 

 canal, in a large bend at about the middle of its length, and a 

 Proc. ZooL. Soc— 1917, No. X. .10 



