166 Transactions. — Zoology. 



The two anterior corrma arise close to one another from 

 the cartilages referred to as joining the anterior end of the 

 basi-hyal. 



Basi-hyal : Greatest breadth, 84 mm. ; greatest length, 

 66 mm. ; thickness, 5 mm. ; length of cartilaginous cap, 18 mm. ; 

 breadth, 20 mm. ; length of ossification in thyro-hyal, 55 mm. ; 

 breadth, 46 mm. ; length of each half of basi- and thyro-hyal 

 from anterior end of cap to posterior end of cornu, 156 mm. ; 

 greatest width across external margins of posterior cornua 

 188 mm. 



Anterior cornu: Total length, 220 mm. ; cerato-hyal car- 

 tilage (along middle line), 37 mm.; stylo-hyal, ,175 mm. ; 

 length of bone (along middle line), 65 mm. ; thickness, 15mm. ; 

 greatest length along hinder margin, 75 mm. 



Skeleton of Fore Limb. — This has been but indistinctly 

 figured by Von Haast, whose specimen was imperfect, and by 

 Wall, but more accurately by Krefft. The scapula is a nearly 

 equilateral triangle, the upper border being curved. The 

 greater part of the outer surface (post-axial fossa) is feebly 

 concave. The inner surface is nearly flat, but as the anterior 

 border is slightly everted so as to form a low rounded but 

 depressed ridge, extending nearly across the bone, and as the 

 superior border is also somewhat everted, the inner face is 

 slightly convex. 



The spine is but feebly developed, but the acromion is a 

 large compressed squarish process, obliquely truncated dis- 

 tally. It bears on its upper margin a shorter process. 



The coracoid process is large and well marked, nearly as 

 long as the acromion, but narrower. The glenoid cup is oval. 



Measurements of Scapula, in Millimetres. 

 Greatest height (measured from highest point of superior 



border to anterior margin of glenoid facet) ... 164 



Length of posterior border ... ... ... 107 



Length of anterior border ... ... ... ... 159 



From antero-posterior angle to origin of acromion ... 76 

 Breadth, greatest (from anterior to posterior angle of 



superior border) . . ... ... ... 184 



Breadth immediately above acromion ... ... 83 



Breadth from posterior margin of glenoid to tip of acro- 

 mion... ... ... ... ... ... 101 



Acromion: Length ... ... ... ... 48 



Acromion: Vertical height, near root ... ... 35 



From posterior margin of glenoid to end of coracoid ... 84 



From anterior margin of glenoid to end of ccracoid ... 47 



Coracoid: Height at root ... ... ... ... 22 



Glenoid facet : Length ... ... ... ... 46 



Glenoid facet : Width ... ... ... 31 



