116 DR. GWYN JEFFREYS ON THE MOLLTJSCA OF TIIE [Feb. 19, 



same as my variety of R. abyssicolu, but also satisfied me that the 

 latter was another variety of R. testa, which is a much older name 

 than abyssicola. 



Alvania asperula of Brugnone appears to be the young. 



B. Flemingia. Ribbed lengthwise and spirally striated ; 

 outer lip thickened and reflected. 



14. RlSSOA ZETLANDICA, Montagu. 



Turbo zetlandicus, Mout., in Tr. Linn. Soc. xi. p. 194, t. xiii. 

 f. 3. 



R. zetlandica, B. C. iv. p. 20 ; v. p. 207, pi. lxvii. f. 1. 



' Lightning ' Exp. : St. 2, 5. 



' Porcupine ' Exp. 1869: St. 13, 14. 1870: Atl. 2,3, 13, 16, 

 17«, off C. Sagres, 27, 28; Med. Adventure Bank. 



Distribution. Loffoden I. to the Mediterranean and Adriatic ; 

 12-200 fms. 



Fossil. ? Miocene : Vienna Basin ( Homes), Transylvania {FLauer 

 and Stac/ie), Modena {Manzoni). Pliocene : Coralline and Red 

 Crag, Biot, and Italy. Post-tertiary : Norway (Crosskey and 

 Robertson); 100 ft. 



Among the synonyms are R. carinata of Aradas and R. cana- 

 liculata of Philippi. This species is probably not the R. zetlandica 

 of Homes, which has a shorter spire and more tumid shape, with 

 stronger and coarser sculpture ; R. scalaris of Dubois comes nearer 

 to our species. R. crispa of Watson, from Madeira, is more closely 

 allied to R. zetlandica. 



15. Rissoa costata, Adams. 



Turbo costatus, Ad. in Tr. Linn. Soc. iii. p. 65, t. xiii. f. 13, 14. 



R. costata, B. C. iv. p. 22 ; v. p. 207, pi. lxviii. f. 2. 



'Porcupine' Exp. 1870; Atl. St. Vigo B., 26, 36; Med. Ad- 

 venture Bank. 



Distribution. Norway, Sweden, Great Britain, and Holland to the 

 Mediterranean and Adriatic, Canaries, and Madeira ; low water 

 at spring-tides to 70 fms. 



Fossil. Pliocene : Italy and Rhodes. Post-tertiary : Clyde Beds 

 and Selsea. 



The principal synonyms are R. exigua of Michaud and R. curinuta 

 of Pliilippi. Not Turbo costatus of Lamarck, which is R. violacea, 

 nor R. costata of Desmarets, which is R. variabilis of v. Miihlfeld. 



Mediterranean and Teneriffe specimens are smaller than northern 

 specimens. 



C. Rissoa. Mostly ribbed lengthwise and spirally striated ; outer 

 lip usually strengthened by a rib. 



' 16. Rissoa monodonta, Bivona. 



R. monodonta (Biv.), Philippi, Moll. Sic. i. p. 151, t, x. f. 9. 

 'Porcupine' Exp. 1870 : Med. St. Algeciras B. 



