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Show 644 PROF. F. J. BELL ON THE GENUS PSOLUS. [Nov. 14 and which will, I trust, be found to contain an exact account of all the facts necessary for forming a judgment on the name to be applied to this generic division, I pass to an enumeration, first, of the forms supposed to be specifically distinct, and, secondly, of the specific names gi\en to forms already described. I. List of the Species regarded as distinct. 1. antarcticus, Philippi, Arch. Nat. 1857, p. 133. [B.M.] 2. appendiculatus, de Blainv. Diet. Sc. Nat. xxi. p. 317. 3. boholensis, Semper, Holoth. p. 62. 4. cataphractus, Sel. Zeitsch. wiss. Zool. xviii. p. 110. 5. complanatus, Semper, Holoth. p. 61. 6. ephippifer, Wyv. Thomson, Journ. Linn. Soc. xiii. p. 61. 7. fabricii, Diiben & Koren, Higr. Kgl. Svensk. Akad. xxxii. p. 316 (note). [B.M.] 8. operculatus, Pourtales, Bull. M . C. Z. i. p. 127. 9. phantapus, Strussenfeldt, Abh. schwed. Ak. xxvii. p. 268. [B.M.] 10. poriferus, Studer, M.B. Ak. Berl. 1876, p. 452. 11. regalis, Verrill, Proc. Bost. Soc. N. H. x. p. 357. [B.M.] 12. squamatus, Koren, Nyt Mag. iv. p. 211. [B.M.] Synonymous terms. 1. granulatus, Ayres (Bost. Soc. N. H. iv. p. 63)=regalis1, VI. 2. lavigatus, Ayres (Bost. Soc. N. H. iv. 25) = phantapus2. 3. sitchaensis, Brdt. (Prod. p. 47)=fabricif. [4. Psolus forbesi (Ann. N. H. (1) xv. p. 174) has no more existence than such as is based on the sentence of Couch (Cornish Fauna, pt. ii. p. 73), " one closely allied to the genus Psolus of Mr. Forbes."] PSOLUS FABRICII. The most important fact with regard to this species that a survey of the British-Museum collection brings to light is an extension of its geographical distribution, which can hardly be said to be unexpected. Among the collections made by Captain H . C. St. John, R.N., in the Japanese seas (presented to the Trustees by Dr. J. Gwyn Jeffreys) are some small specimens which cannot, I think, be referred to any other than this species ; for though they present an imbrication of the scales which is remarkable when compared with the extent of that imbrication in two large specimens from the coast of Greenland, it is not so remarkable when we take into consideration the example, intermediate in size between these two sets, which was collected off Greenland by H.M.S. * Valorous' (and figured by Messrs. Duncan and Sladen in their ' Arctic Echinodermata,' pl. i.). Further, it is to 1 The Psoitis granulatus of Grube (Actin. &c. d. Adriat. u. Mittelmeers, 1840, p. 38) does not belong to this genus, but to Hemicrepis, J. Miiller. 2 See Stimpson, Inv. Gd. Man. p. 16 (1853, and not 1854 as given by Sel., and Verrill, Proc. Bost. Soc. N. H. xii. p. 353). 1 See H. Ludwig, Zeitsch. f. wiss. Zool. xxxv. p. 588. |