OCR Text |
Show 885.] 'LIGHTNING'AND'PORCUPINE'EXPEDITIONS. 41 the 'Annals and Magazine of Natural History' for October 1876 and March 1883. I have verified the description. 3. ADEORBIS FRAGTLIS, G. O. Sars. A.fragilis, G. O. Sars, Moll. reg. arct. Norv. p. 213, t. 22. f. 19, a-c. 'Porcupine' Exp. 1870: Atl. 16, 27. Distribution. Loffoden I. and western coast of Norway ; 60- 190 fms. Somewhat resembling A. pulchralis of the Coralline Crag, but of a thinner texture, the spire more raised, the whorls more convex, the sculpture much slighter and irregular, and the umbilicus more open. This and the next species appear to be closely allied to Fossarus, the position of which genus has not been satisfactorily determined : it was placed with Solarium by Woodward, in the Littorina family. According to Troschel, the dentition of Fossarus agrees in some respects with that of Turritella. 4. ADEORBIS DEPRESSUS, Seguenza. (Plate IV. figs. 8, 8 a.) Fossarus depressus, Seg. Bull. Real. Comit. Geol. Ital. 1874, fasc. ii. p. 382. 'Porcupine' Exp. 1870 : Atl. St. 24, 30. Distribution. Algiers (Weinkauff^, as Fossarus crossei of Kleiak)!, Strait of Messina (Seguenza and Granata) !, Palermo (Monterosato), Brindhd (Aradas)\ ; 11-108 fms. Fossil. Pliocene : Messina (Seguenza). This pretty little shell, examined under a microscope, is exquisitely sculptured by close-set longitudinal folds and intermediate spiral striae, or thread-like lines. Some specimens have the whorls more or less disunited in cornucopia fashion. It seems to connect Adeorbis with Fossarus. According to the catalogue of Kleiak's collection of Dalmatian shells his Natica crosseaiia is a synonym of Fossarus petitianus, Tiberi = Stomatia azonea, Brusina. FOSSARUS RETICULATUS, S.Wood. (Plate IV. fig. 9.) Lacuna reticulata, S. Wood, Mon. Crag Moll. vol. i. p. 122, t. xii. f. 10, and t. xv. f. 12. Fossarus interjunctus, Jeffreys, M S . S H E L L oblong, rather solid, semitransparent, lustreless : sculpture, numerous, curved, and rather sharp longitudinal ribs which cover the last or body-whorl; these and their interstices are crossed by more numerous close-set and minute spiral striae, but not so as to cause cancellation ; the upper whorls are quite smooth : colour light yellowish brown : spire somewhat elongated or extended, and ending in a blunt point: whorls 4, rather convex, the last disproportionately large the uppermost bulbous and intorted : suture deep: mouth oval:' outer lip thick: inner lip attached to the pillar: umbilicus |