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Show 1885.'] 'LIGHTNING' AND'PORCUPINE'EXPEDITIONS. 59 uppermost spiral row : mouth rhomboidal; and all other characters similar to those of T. perversa. L. 0'6, B. 0* 15. 'Porcupine' Exp. 1870: Atl. St. 16, 24, 27-30; Med. Adventure Bank. Distribution. Bay of Biscay ('Travailleur' Exp. 1882), Sciacca, Sicily (Monterosato), G. Mexico (Pourtales); 125-731 fms. Distinguishable from T. perversa by being more slender, and having more prominent tubercles so as to give the shell a rougher aspect. The base is also more square and as if truncated. A. Typical; apex acuminated. 1. CERITHIOPSIS TUBERCULARIS, Montagu. Murex tubercularis, Mont. Test. Brit. p. 270. C. tubercularis, B. C. iv. p. 266, pi. iv. f. 5 ; v. p. 21 7, pi. lxxxi. f. 1. 'Lightning' Exp. St. 5. 'Porcupine' Exp. 1870: Atl. 3a, 13, Vigo B.; Med. Adventure Bank (var. nana). Distribution. Christiansund (Lilljeborg)\ to Alexandria(Ponsonby)], W . Africa ('Talisman' Exp.) !, Madeira (Watson) !, Canaries (Mc Andrew) !, Boston Harbour southwards (C. B. Adams and others)!, G. Florida (Hall), Queen Charlotte's I. (Whiteaves) ; 0-1039 fms. Hab. Littoral and laminarian zones. Fossil. Miocene : Vienna Basin, Calabria, and ?Rhodes. Pliocene : Red and Coralline Crags, Belgium, Biot, Italy, and Rhodes. Post-tertiary : Norway, Scotland, Ireland, and ? Rhodes. Cerithium pygmaum, Philippi, Cerithium henkeliusii (posthac henkelii), Nyst, Cerithiopsis acicula and C. minima, Brusina. Not Cerithiopsis tuberculata, P. Carpenter. I must still retain m y opinion that C. clarlcii, alias bilineata, or coppola, is merely a monstrous or irregular form of the present species. One of my specimens, which has only two rows of tubercles on the lower whorls, has three rows on two of the upper whorls. The lower rows seem to have become squeezed together and elongated. A small and slender variety is C. acicida of Brusina, = Cerithiolum dextrum, Watson, ex typis. I regard Cerithiopsis atalaya of Watson as another variety. Dr. Tiberi found large and small varieties of C. tubercularis living with Modiolaria marmorata in the tunic or outer coat of Ascidia mentula at Naples. Were the two mollusks commensal or quasi-parasitic, like species of Eulima and Stilifer 1 De Blainville in his 'Faune Francaise' included not only this species but also Cerithium reticulatum and Triforis perversa in his Cerithium tuberculare. The apical or top whorls in fresh and perfect specimens, when examined under a microscope, are seen to be very finely and closely ribbed lengthwise. Occasionally specimens have four rows of tubercles on the lower whorls. |