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Show 1882.] 'LIGHTNING'AND'PORCUPINE'EXPEDITIONS. 673 He says it is " not an Acmeid," and would place it near Capulus but he qualifies his remark by saying that " it is barely possible it may be a Cocculina.1" He is an unquestionably good authority on this as well as other departments of the Mollusca; and I venture with much hesitation to differ from him. ADDISONIA ECCENTROS, (EXCENTRICA) Tiberi. Gadinia excentrica, Tib. in Journ. Conch, vi. p. 37, pl. ii- f- 6. ' Porcupine' Exp. 1870 : Atl. St. 16; Med. Adventure Bank. Two specimens. Distribution. Coral-fishery, Sardinia (Tiberi) ; a single specimen, with Gadinia gussoni. I have made a slight change in the specific name by substituting a classical word for one which is not Latin. This remarkable shell appears to be the Addisonia paradoxa of Dall (Proc. U.S. Nat. Mus. 1882, p. 405), which was dredged by Verrill off the New-England coast in 69-130 fathoms. Dall long ago pointed out that Tiberi's species was not a Gadinia. Tiberi's G. compressa (recent and fossil), of which through his kindness I possess specimens, is certainly a species of Lepetella, Verrill, and comes near L. tubicola, which has been lately found by G. O. Sars on the western coasts of Norway. Addisonia appears to be allied to Pilidium. See the above-cited ' Proceedings of the United-States National Museum' for Dall's excellent and elaborate paper on the families Cocculinida and Addisoniida, consisting of the genera Cocculina and Addisonia. The present species is not the Patella excentrica of Sandberger from the Mayence Basin. Although tbe genera Umbrella and Tylodina (which are closely allied) have a patelliform shell, there is a peculiarity in that respect whicb connects them with Aplysia and the Nudibranchs, viz. in the spiral andheterostrophe nucleus. Tylodina duebeni of Loven occurred at Stations 24 and 27 of the ' Porcupine' Atlantic dredgings in 1870. It seems rather strange that M. Gaston Moquin-Tandon, in his long and studiously exhaustive memoir on the Umbrella of the Mediterranean, did not notice this peculiarity, nor even assign or propose any place for that genus in the classification of the Mollusca, while he freely criticised all previous writers on the anatomy of the animal. 1. PROPILIDIUM ANCYLOIDES, Forbes. Patella ancyloides, Forb. in Ann. Nat. Hist. v. p. 108, pl. ii. f. Propilidium ancyloide, B. C. iii. p. 254, pl. vi. f. 1 ; (P. ancyloides) v. p. 200, pl. lviii. f. 7. ' Lightning ' Exp., St. 5. 'Porcupine' Exp. 1869 : St. 1, 6, 13, 14, 19. 1870 : Atl. 16, 17, 17a; Med. Adventure Bank. Distribution. 'Valorous' Exp., Loffoden I. to Galway coast, Kimmeridge B. Dorset (Pleydeli) 1, Naples (Acton), Trapani, Sicily (Seguenza) ; 10-1450 fms. Eossil. Pliocene: Sicily. Post-tertiary: Christiania; 30-100 ft. Rostrisepta parva of Seguenza. 45* |