318 EDWARD PHELPS ALLIS, JR. 
trigeminus which, in fishes, traverses the trigemino-facialis cham- 
ber, and hence must be a prespiracular nerve. 
The internal carotid artery enters the cranial cavity, in most 
vertebrates, by passing upward mesial to the related trabecula, 
or mesial to the posterior prolongation of the trabecula formed 
by the polar cartilage, but in Amiurus it enters the cranial cavity 
through the foramen opticum, and hence would there seem to 
pass lateral and then dorsal to the trabecula. In embryos of 
the Mammalia ditremata this artery is said to also pass upward 
lateral to the trabecula, but it is probable that it here simply 
passes lateral to the infrapolar process of the polar cartilage, the 
latter cartilage not itself fusing directly with the parachordal 
plate, and its direct relations to the artery thus being obscured. 
Palais de Carnolés, Menton, France, 
May 1, 1918 
LITERATURE CITED 
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fishes. Proc. Washington Acad. Sci., vol. 7. 
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in Amia calva. Jour. Morph., vol. 12. 
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Quart. Jour. Microsc. Sci., vol. 45. 
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Anat wAnZ Bassas: 
1908 b The pseudobranchial and carotid arteries in Ameiurus. Anat. 
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