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Show 1008 MR. L. R. CRAWS HAY ON THE ARTERIAL [Dec. 11, The jaws bear a single row of distinct blunt denticles, set at some distance from one another. Some of them show traces of bifurcation at the tip. As Farran lias observed (I. c. p. 331), this species seems to be a llervici, although Bergh (System, p. 1032) suggested it might be a synonym of Facelina rubvovittata. But both the description and figure of Alder and Hancock represent the rhinophores as smooth. D oridopsis and D o r io p s il l a . An error occurs in the numbering of the figures representing these genera 011 Plate XLVII. of my previous paper, as published in the Society's ‘ Proceedings,' although the numbers are correct in the copies printed separately. Numbers 4 and 5 should be transposed ; that is to say, the lower figure represents Doridopsis nigra and should be numbered 5, while the upper figure represents Doriopsilla miniata and should be numbered 4. 7. On Variations in the Arterial System of certain Species of the Anura. By L i o n e l R . C r a w s h a y , M.A * [Received October 22, 1906. (Text-figures 143-155.) In the original and subsequent editions of Ecker's and Wiedersheim's 4 Anatomie des Frosches,' the species employed for investigation were exclusively liana esculenta Linn, and liana temporaria auct., and particularly the former. The species R. catesbiana Shaw and R. silvatica Leconte were also, it is stated, examined by Ecker for comparison, but no reference is made to them in the text. Besides the portion of these works devoted to the subject, which has been so greatly extended by Gaupp 111 the last edition, there is, so far as I am aware, no other published record dealing with the general arterial system of the Anura, so that the work, it would seem, has so far been practically confined to the two first-named species. While working a short time ago, by the kindness of Mr. Beddard, at the Prosectorium of the Zoological Society's Gardens, I was very greatly indebted to him for enabling me to examine, in addition to the above named, certain other species of the Anura, in some of which a considerable portion of the arterial system was worked out in detail. These comprised single specimens of liana catesbiana Shaw, Ji. tigrina Daud., R. hexadaclyla Less., Bufo boreas B.&G., and B. mauritanicus Sclileg., and two specimens of liana clamala Daud. It is true that the extent of variation, sometimes even in important points, to which the arteries are liable in individuals * Communicated by F. E. B e d d a e d , M.A., F.R.S. |