1883.] 'lightning' AND 'porcupine' liXPKDlTHJNS. 91 



Fossil. Pliocene: Ficarazzi {Brugnone). 



The shell is usually striated on the base only ; but some speci- 

 mens are striated on the upper whorls also, and others are occa- 

 sionally striated throughout. For this reason I should have pre- 

 ferred another specific name ; but Weinkauff, in his excellent and 

 useful Catalogue of the Shells of the European Seas, as well 

 as Friele, in his 'Oversigt over de i Bergen omegn forekomenender 

 skaldsegter Mollusker,' adopted my MS. name some years before 

 Brugnone described another shell as fossil under the same name. 

 See Mollerin leviyatn ante. The odontophore is figured by Friele. 



C.profundum of Friele, from specimens striated throughout. 



^ 5. Cyclostrema cutlerianum, Clark. 



Skenea cutleriana, Clark in Ann. & Mag. N. H. (n. ser.) iv. 

 p. 424. 



C. cutleriamim, B. C. iii. p. 287 ; v. p. 201, pi, Isi. f. 1. 



'Porcupine' Exp. 1870: Atl. St. Vigo B. 



Distribution. Skye, S. England, Guernsey, Naples and Sicily ; 

 i.5-40 fms. 



Fossil. Pliocene : Calabria and Sicily. Post-tertiary : Montreal 

 i^Dawson). 



i/ 6. Cyclostrema nitens, Philippi. 



Belphinula nitens, Phil. Moll. Sic. ii. p. 146, t. xxv, f. 4. 

 C. nitens, B. C. iii. p. 289 ; v. p. 201, pi. Ixi. f. 2. 

 'Porcupine' Exp. 1870: Med. St. off Rinaldo's Chair. 

 Distribution. Shetland to the ^gean ; 0-913 fms. 

 Fossil. Pliocene : Calabria and Sicily. Post-tertiary: Co. Antrim. 

 Margarita pusilla, Jeffreys, 1848; var. Skenea 1 leevis, Forbes 

 and Hanley. 



7. Cyclostrema trochoides, Jeffreys. 



C. trochoides (Jeffr.), Friele, Bidr. Vestl. Molluskf. (Vid. Forh. 

 1875) p. 2, separate copy ; G. O. Sars, Moll. reg. arct. norv. p. 131, 

 t. 8. f. 9, a-c. 



'Porcupine' Exp. 1870: Atl. St. I7a (living). 



Distribution. Finmark and W. Norway, Bay of Biscay ('Travail- 

 leur' Exp. 1880), Palermo (Monterosato), N. England (Verrill) ; 

 10-372 fms. 



The umbilicus is sometimes encircled by one or more strong 

 spiral striae. 



Var. C. peterseni, Friele. He has figured the odontophore. 



^ 8. Cyclostrema TENERTJM ', Jeffreys. (Plate XIX. fig. 2.) 



Shell globosely conical, thin and delicate, semitransparent, 

 lustreless : sculpture extremely fine and close-set but nearly micro- 

 scopic spiral striae, which are wanting on the base and replaced by 

 a rugose or fretted appearance : colour pale yellowish-white, with a 



' Tender. 



