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EXPLANATION OF PLaTEs. 
Reference Letters. 
. car.—Internal carotid arteries (the two outer ones). 
. car’ .—External carotid artery. 
. Cm.—Coeliaco—mesenteric artery. 
Pb fh fe fb 
. coe.—Coeliac artery. 
A, ep.—Right epibranchial artery. 
A. F’.—Anal fin. 
Af. Br. 1—4.—First to fourth afferent branchial arteries. 
A. gen.—Common genital artery. 
A. gen’—Right genital artery. 
A, hep.—Hepatic artery. 
A, hy.—Hyoidean artery. 
Al. S.—Alisphenoid. 
amp. a. 
eye | Anterior, external, and posterior ampulle of the semicircular 
Jie canals. 
amp. Pp. , 
An.—Angular. 
a. Nos. ) ; ¢ : 
-—Right and left anterior nostrils. 
a. nos’ . ) 
ant. cr.—Crista acustica ampulle anterioris. 
Ao. d.—Dorsal aorta. 
A. e@.—Oesophageal artery. 
A. op.—Ophthalmice artery. 
Ao. V.—Ventral aorta. 
A. pe.—Pelvic artery. 
Ar.—Articular. 
A.R.—Accessory ribs or intermuscular bones, numbered from before back- 
wards. 
A.R.*—Tubercle on fourteenth and many of the succeeding vertebra, 
representing probably a fused accessory rib. 
a. 8. ¢.—Anterior semicircular canal. 
A. scl.—Right and left subclavian arteries. 
A. sp.—Splenic artery. 
Aur.—Auricle. 
Aw.—Axonosts or interspinous bones, numbered from before backwards. 
Aw.* —Transverse ligament connecting axonost with skin. 
Ax.’ —Triangular plug of cartilage occurring in the head of every 
axonost. 
A. Zy.—Anterior zygapophysis. 
