REPOET ON THE GASTEROPODA. 57 



] 4. Trochus (Ziziphinus) zizyphinus, Linne. 



Trochus zizyphinus, Linne, Syst. Nat., 12th ed., p. 1231, No. 599. 



„ zezyphinus, Chemnitz, Conch. Cab., vol. v. p. 66, pi. clxvi. figs. 1592-94. 



„ zizyphinus, Lamarck, Anim. s. vert., vol. vii. p. 23, and (ed. Desh.) vol. ix. p. 142, sp. 46. 



„ „ Dillwyn, Cat., vol. ii. p. 799, sp. 94. 



„ „ Philippi, Conch. Cab. (ed. Kiister), p. 62, sp. 59, pi. xiii. fig. 6. 



„ „ Wood, Ind. Test. ed. Hanley, p. 146, pi. xxix. fig. 94. 



„ albidus, Wood, Ind. Test. Suppl., (ed. Hanley), p. 219, pi. v. fig. 14 {zizyphinus). 



„ zizyphinus, Forbes and Hanley, Brit. Moll., vol. ii. p. 491, pi. lxvii. figs. 1-6. 



„ conulo'ides, Reeve, Conch. Icon., vol. xiv. pi. ii. fig. 16 (in part). 



,, ziziphinus, Searles Wood, Crag. Moll., vol. i. p. 124, pi. xiii. fig. 9, a — h. 



„ vulgaris, Adams, Monog. Trochid., Proc. Zool. Soc. Lona., 1851, p. 163, sp. 1. 



„ zizyphinus, Hanley, Ipsa Linn. Conch., pp. 322, 529. 



,, zizyphinus, Jeffreys, Brit. Conch., vol. iii. p. 330, sp. 15, and vol. v. p. 204, pi. lxiii. fig. 6. 



„ „ Hidalgo, Moll. test, marins Espagne, Journ. de conch., vol. xv. p. 400, sp. 1. 



,, „ Hidalgo, Molluscos Marinos de Espana, pi. lix. figs. 1-5. 



,, „ Weinkauff, Conch, d. Mittelm., vol. ii. p. 358, sp. 4. 



„ „ Aradas and Benoit, Conch, viv. Sicil., p. 160, No. 427. 



,, „ Monterosato, Enumeraz., p. 21. 



G. O. Sars, Moll. Reg. Arct. Norv., p. 141, No. 41. 

 „ „ Seguenza, Form. Terz. Calabria, pp. 271, 320, 350. 



„ „ Fischer in Kiener's Iconog., p. 123, sp. 44, pi. xiii. fig. 2. 



„ „ Jeffreys, "Lightning" and "Porcupine" Moll., Proc. Zool. Soc. Lond., 1883. 



p. 106, no. 32. 



Station 75. July 2, 1873. Lat. 38° 38' N., long. 28° 28' 30" W. Off Fayal, Azores. 

 450 fathoms. Volcanic mud. 



Habitat. — From Finmark and the Faeroes to the Canaries and the Mediterranean from 

 to 85 fathoms. 



Fossil. — From the Miocene of the Vienna basin (Jeffreys), and from the Middle 

 Pliocene onwards (Seguenza). 



This is another of the cases to which I referred under Trochus exaspcratus, Pennt., where the 

 marking on the label sent to me did not agree with the officially published depth. 



The species is one which every one knows, but about the synonymy of which everybody has his 

 own opinion. In quoting authorities, my aim has been to choose such as are least in debate, as 

 bearing on what in this country is accepted as Linne's species, omitting all, or nearly all, about which 

 cpiestions have been raised. The Challenger specimens are mere pulli in the worst condition, but 

 belong unmistakably to Linne's species, and do not require the stirring of any inquiry about the 

 relations of TrocMts Ziziphinus to Trochus conulus or to Trochus conulo'ides. 



15. Trochus (Ziziphinus) arruensis, 1 Watson (PI. VI. fig. 5). 



Trochus (Ziziphinus) arruensis, Watson, Prelim. Report, pt. 5, Journ. Linn. Soc. Lond., vol. xv. p. 91. 



September 18, 1874. Arrou Islands, S.W. of Papua. 



(ZOOL. CHALL. EXP. — PART XLII. — 1885.) Tt 8 



