Ml 



1905. The skull of a Thylurine (ThylacinH* tynncrphaltui). 



A longitmlinsJ and horuooul section has been made to exhibit the cranial rarity. Thi if 

 much smaller than in the dog or other placenta! carnirorr of equal sue with the Thylacine. 

 Neither falx nor tentorium it OMJntd. The petro**! is impressed by a deep and large cere- 

 bellar pit. A brutle if nsssfd through the canals for the jugular and Mjuamotal veins. The 

 rhinenoephalk division of the cranium i* relatively large and well-defined : the lella turcica is 

 initirated only by the internal orificet of the carotid canab. The lacrymal bone U perforated 

 both within and without the orbit. The posterior palatal vacuities are wide, and expo* the 

 turbinal bone* to new. The frontal sinuses are much expanded. 



1'rrtented by //. Everett, Eq. 



1906. The skull of a female Thylacinc (Tkylacintu cynocephalm). vertically and 

 longitudinally bisected. 



A brutle u patted through the precondyloid and carotid canali. 



Presented by Capt. Sir John FranUin, R.N. 



1907. The partially disarticulated cranium of a male Thylacinc (Thylacimu cynoce- 

 pkaliu). Presented by Capt. Sir John Franklin, R.N. 



190S. The disarticulated bones of the head of a full-grown Thylacinc (Thylacintu 

 cynocepkaliu). 



The baiioccipital hat coalesced with the exoocipitals, which almost meet above the foramen 

 magnum. The lateral finut impresses the fore part of each exocripital, and tbrn sinks into 

 a canal which communicates or opens into the precondyloid canal : from this another canal 

 extends forwards through the side of the basioccipital. The superoccipital has coalesced with 

 the |Muietals and interparietal. The basisphenoid has coalesced with the alispbcnoids and 

 the presphenoid, but not with the pterygoids : it has no ' sella ' nor clinoid processes. The 

 coalesced presphenoid rises into a convex prominence above ; it is perforated by the carotid 

 at its back and outer angle : the canals converge forwards and slightly upwards, and terminate 

 above the middle of the basisphenoid. The alisphenoid* have the foramen ovale nrar their 

 posterior borders : the foramen rotundum is a longer canal. The posterior angles of the 

 aliaphenoid expand into tympanic bull*- : ectopterygoid processes are sent off in advance of 

 those which join both pterygoids and palatines. The parietals hare coalesced with each other, 

 with the frontal, with the interparietal, and the occipital. The orbitosphenoids are very 

 small ; their coalesced bases arch backwards over the optic nerves and presphenoidal pro- 

 longation of the basisphenoid, as in the bird, and their under part is grooved (not perforated) 

 by the optic nerves, which escape by the fissura lacera anterior. 



The nasal portion of the coalesced frontal* is more expanded than the cerebral part : the 

 frontal sinuses extend to the coronal suture, and raise the outer far above the vitreous table : 

 in this table the frontal and coronal sutures remain, but they are obliterated in the outer table. 



