56 DR. GWYN JEFFllEYS 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. algerianum, Sowerby, Thes. Conch, p. 129, f. 230, 231. 



'Porcupine' Exp. 1870: Atl. St. Tangier B. ; Med. 50, Benzert 

 Road, Rasel Amousb, 



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

 Madeira {Watson) ! ; 29-108 fms. 



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

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



Judging from the description and figure given by De Blainville of 

 his C. elegans in tbe ' Faune Frangaise,' I cannot agree vi-ith 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, 17«, 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 Vertagiis of Klein, 

 or Bliinoclavis of Swainson, which is a subgenus of Cerithium 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. 



Strombifo7-mis reticulatus, Da C. Brit. Conch. (1778) p. 117, 

 pi. viii. f. 13. 



G. 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 tbe 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 

 ' Nomenelator Zoologicus,' 1882. 



