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Show 1884.] ' LIGHTNING ' AND 'PORCUPINE ' EXPEDITIONS. 129 varieties of //. ventrosa) he criticizes Kiister for placing Hydrobia Pennant's Turbo ulva, contending that it is "une veritable Assiminea." I have already shown in ' British Conchology,' vol. v. p. 208, and in the foregoing notice of II. ulva, that A. gallica of Paladilhe is the typical form of the above species. Family X. PALUDINID^E. BITHYNIA RUBENS, Menke. Paludina rubens, Menke in Chemn.-Kust. pi. 9. f. 27-29. 'Porcupine' Exp. 1870: Med. St. 51. Two small specimens, which had been probably carried out to sea from a freshwater river or stream and deposited in 1415 fathoms. Distribution. Sicily, Algiers (coll. Weinkauff.). Family XI. HETEROPHROSYNID^E. B A R L E E I A RUBRA, Montagu. Turbo ruber, Mont. Test. Br. p. 320. B. rubra, B. C. iv. p. 56, pi. I. f. 2; v. p. 209, pi. lxix. f. 4. 'Porcupine' Exp. 1870: Atl. St. Gibraltar B.; Med. 50, Benzert Road. Distribution. Hellen in Bergensfiord (Friele), northern and western coasts of Ireland, southern counties of England, N. and W. coasts of France and Spain, Mediterranean and Adriatic, Canaries and Madeira (McAndrew), C. Verd I. (Rochebrune), off Pernam-buco ('Challenger'Exp.) !; littoral and laminarian zones to 120 fms., the greater depths being probably accidental. I distrust the recorded localities in Scotland, the North of Eugland, and South Wales. Fossil. Pliocene : Central and Southern Italy. Post-tertiary : Leghorn. The only noticeable synonym is Rissoa fulva of Michaud. Family XII. SKENEIDJE. H O M A L O G Y R A DENSICOSTATA\ Jeffreys. (Plate X. fig. I.) S H E L L somewhat resembling in shape Planorbis trivolvis of Say, rather thin, semitransparent, and glossy : sculpture, extremely numerous and close-set striae in the earlier and middle stages of growth, which ultimately disappear and become microscopic lines; the upper part of the periphery as well as the base of the shell are encircled by a sharp keel which intersects the spiral striae : colour whitish: spire deeply sunk on both sides: whorls 4, compactly coiled ; the last is swollen and disproportionately large ; the others rapidly decrease in size: suture narrow but excavated: mouth horseshoe-shaped, with a thin edge, and expanding outwards: umbilicus very wide and open, completely exposing the spire on each side. L. 0*05. B. 0*075. 1 Closely ribbed. PROC. ZOOL. Soc-1884, No. IX. 9 |
