56 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Jan. 20, 



Bittium ', Leach. Basal notch shallow and not recurved ; 



apex regular. 



7. Cerithium lacteum, Philippi. 



C. lacteum, Phil. Moll. Sic. i. p. 195. 



C. alyerianum, Sowerby, Thes. Conch, p. 129, f. 230, 231. 



'Porcupine' Exp. 18/0: Atl. St. Tangier B. ; Med. 50, Benzert 

 Road, Basel Amoush. 



Distribution. Cap Breton {De Folin)\, Mediterranean and Adriatic, 

 Madeira (7Fa;so?«) !; 29-108 fms. 



Fossil. Pliocene : Calabria and Sicily {Philippi and Seguenza), 

 Madeira {Mayer). Post-tertiary : Sicily {Aradas and Brugnone). 



Judging from the description and figure given by De Blainville of 

 his C. elega7is in the ' Faune Frangaise,' I cannot agree with Weinkauff 

 in regarding it as the present species. 



8. Cerithium watsoni, Jeffreys. (Plate VI. figs. 6, 6 a.) 



C. gemmatum, Watson in Journ. Linn. Soc. (Zool.), vol. xv. 

 p. 113(1880). 



' Porcupine ' Exp. 1870: Atl. Vigo B., 13, 16, 17a, Setubal B., 

 24, 26-34, 36. Abundant. 



Distribution. N. Spain (' Travailleur' Exp.), Setubal B. ('Chal- 

 lenger' Exp.), Josephine Bank ('Josephine' Exp.), off Marocco 

 (' Talisman ' Exp.) ; 217-1029 fms. 



The animal is yellowish-white, with a faint tinge of brown in front : 

 snout small : tentacles cylindrical, short : eyes seated on bulbous 

 offsets of the tentacles, about one third from their bases : foot thick : 

 operculum yellowish, circular, and paucispiral, with imbricated edges. 



Sculpture variable, the longitudinal ribs sometimes disappearing 

 on the last and next whorl, although the spiral ribs seem to be always 

 present. Apex as in G. lacteum. 



Not C. gemmatum of Hinds, 1844, the type of Vertagus of Klein, 

 or Bliinoclams of Swainson, which is a subgenus of C'erjY/n'M/w accord- 

 ing to Dr. Paul Fischer. I have therefore given the present species 

 the name of my friend the Rev. Robert Boog Watson, who has so 

 admirably worked out the new species of Univalves from the ' Chal- 

 lenger ' Expedition. 



9. Cerithium reticulatum, Da Costa. 



Strombiformis reticulatus, Da C. Brit. Conch. (1778) p. 117, 

 pi. vhi. f. 13. 



C. reticulatum, B.C. iv. p. 258, pi. iv. f . 4 ; v. p. 217, pi. ixxx. 

 f. 4. 



'Porcupine' Exp. 1869: St. Donegal B. (large specimens), 33. 

 1870: Atl. Vigo B., 26, 30 ; Med. Algesiras B., 5.5, Benzeit Road, 

 G. Tunis, Adventure Bank. 



^ This name appears for the first time in Gray's 'List of Genera,' on the tra- 

 ditional or supposed authority of Dr. Leach. It does not occur in Scudder's 



' Nomenclator Zoologicus,' 1882. 



