The _S. interlineata_ is figured in the Railroad Reports; see vol. V, Geological Report, plate IV, fig. 30; and for Mr. Blake’s remarks and Mr. Stimpson’s description, the same Report, chap. XII, p. 153. Dr. J. Blake made some remarks on specimens, presented by him, of infusoria, found in the sand-hills, south of Point Lobos, and which form a kind of concretions, fixing the sand in its place. Dr. Ayres made the following remarks in relation to the genus NOTORHYNCHUS: This genus was defined by me in 1855 (Proc. Cal. Acad. Nat. Sci., vol. I, p. 72) to include a species occurring in the Bay of San Francisco. In 1858 Girard refers to the species (P. R. R. Rep., vol. X, p. 367) under the generic name HEPTANCHUS, of which he considers NOTORHYNCHUS a synonym. In 1861, Mr. Gill refers it to Rafinesque’s genus HEPTRANCHIAS. (Annals of the Lyc. Nat. Hist., N. Y., vol. VIII, Dec.) In a more recent paper (Proc. Acad. Nat. Sci., Phil., Oct., 1862) Mr. Gill restores my species to the name under which it was originally described. He says: “This generic name of NOTORHYNCHUS was proposed by Dr. Ayres under a misapprehension.” My “misapprehension” was that I regarded the species as the type of a new genus; a conclusion at which Mr. Gill himself has, after several changes, also arrived. He gives as a synonym of NOTORHYNCHUS only “HEPTANCHUS, Sp. Müller and Henle, Gray, Girard, Gill,” whereas it is necessary to include also “HEPTRANCHIAS, Gill,” as above indicated. I may remark that the description given by Mr. Gill of the teeth of _Notorhynchus maculatus_, (Proc. Acad. Nat. Sci., Phil., Oct., 1862, p. 495) will not bear examination. It represents the individual specimen on which it was founded; but the species is quite common here, and I find that the number and the forms of the teeth vary so much, that my original description, which Mr. Gill says is “equally applicable to any species of the family,” is fully as close as nature will allow us to draw. I am at a loss to understand how it is possible for him to refer the jaws of a shark, collected at a point so far removed from us as Nisqually, to my species, when my description is so extremely indefinite. Professor Whitney gave an account of an interesting collection of Japanese minerals and fossils, in the possession of J. H. Van Reed, Esq., of this city.