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Show 1906.] SYSTEM OF CERTAIN SPECIES OF ANURA. 1009 of the same species, considerably lessens the importance attaching to such variations as may occur between isolated individuals of different species. Dealing with limited material, the present paper is submitted in the hope that it may not be without value as a contribution to the further study of the subject, and more especially perhaps from the wider aspect of the arterial system of the Anura as a whole. In the portion of the arterial system here considered, the Aa. carotis cerebral is, occipito-vertebralis, brachialis, and ischia-dica are omitted. The species will be considered together as far as possible, the account in Gaupp's edition of Ecker's and Wiedersheim's 1 Anatomie des Frosches ' being followed as a basis of reference. The nomenclature of the arteries is that adopted in the same work, but in the case of the muscles the system used in the original edition of Ecker is retained. In regard to the latter, among the muscles to be referred to a difference of nomenclature occurs in the following *.- E c k e r . G a u p p . M. coraco-humeralis. = M. coraco-brachialis longus. ,, ileo-psoas. = ,, iliacus interims. ,, infraspinatus. = ,, dorsalis scapulce. ,, levator anguli scapulce. = ,, levator scapulce inferior. ,, obhquus interims. = ,, transversus. ,, subscapular is. = ,, coraco-brachialis brevis. ,, transver so-scapular is major. = ,, serratus inferior. „ „ „ minor.- ,, „ medius. ,, triceps brachii. = ,, anconeus. The A. bulbi cordis had not in all cases the same point of origin. In R. tigrina, R. clamata, and R. catesbiana, it arose from the base of the right carotid arch; in R. hexadaclyla, the same, but close against the margin of the right systemic ; in Bufo borects from the base of the right systemic; in Bufo mauritanicus from the base of the left carotid arch. In each case, the artery ran across the base of the three light arches and divided into branches supplying the dorsal and ventral sides of the bulbus but not apparently extending beyond it. I . C ar o t id S y s t em . The A. carotis externa appeared in Bufo boreas to arise from near the centre of the carotid gland, instead of from its proximal margin as in other species. The r. musculo-glandularis was given off a short way from the base of this artery in all the species, supplying vessels to the thyroid gland and hyoidean muscles in this region. The close association of this branch with the thyroid was especially well exhibited in R. hexadactylci and R. tigrina, where the gland was much broken, and a branch of the artery ran in communication with the several disconnected portions. It is remarkable, |
