104 DR. GWYN JEFFREYS ON THE MOLLTJSCA OF THE [Mar. 6, 



Distribution. Josephine Bank (' Josephine' Exp.) ; 340-430 fnns. 

 Fossil. Pliocene : CoraUine Crag, Sutton. 



v' 25. Trochus ditropis, Searles Wood. 



T. ditropis, S. Wood, Crag Moll. p. 133, t. xiv. f. 9, a-b. 



'Porcupine' Exp. 1870: Med. St. Algesiras B., 50. A single 

 specimen from each station. Umbilicus small. 



Distribution. Palermo ( Monierosato) ; about 22 fms. 



Fo.<isil. Pliocene : Coralline Crag, Sutton. 



The specimen from Algesiras Bay is sculptured spirally and 

 coarsely, like the Crag specimens ; that from Station 50 is very finely 

 and closely striated lengthwise on the upper part of the body-whorl, 

 besides having the same spiral strife on the rest of the shell. Both 

 these specimens have purplish-brown blotches. Umbilicus very 

 small. 



Not the very young of T. guttadauri, as might be hastily sup- 

 posed. I am not disposed to refer the present species to T. bian- 

 gulatus of D'Eichwald ('LetliEea Rossica,' iii., derniere periode, p.226, 

 esp. 199, pi. ix. f. 1.5, «, b ; 1853), which is very much larger than 

 T. ditropis, and is described as very finely striated in an oblique 

 direction as well as spirally or transversely, and as having a larger 

 umbilicus. 



E. ZiziPHiNus, Leach. 

 1/ 26. Trochus montacuti, (jnontagui) W. Wood. 



T. montagui, W. Wood, Ind. Test. Suppl. pi. 6. f. 43. 



T. montacuti, B. C. iii. p. 320 ; v, p. 203, pi. ixiii. f. 1. 



' Lightning ' Exp. St. 5. 



' Porcupine ' Exp. 1869 : St. 6. 1870 : Atl. Vigo B. 



Distribution British and Belgian coasts to Malta, var. nana, 

 coast of Tunis (' Shearwater ' Exp.), Canaries (McAndrew) ; 7- 

 95 fms. 



Fossil. Pliocene: Coralline and Red Crag, Antwerp Crag?, S. 

 France, Italy ?, and Rhodes ? 



T. cyrncevs, Requien, T. tumidulus, Aradas, and T. parvulus, 

 Philippi. T. turgidulus of Brocchi is more conical, the whorls are 

 less convex, and the sculpture is finer ; but the present species may 

 be its slightly altered descendant. The umbilicus has occasionally a 

 small perforation. 



27. Trochus striatus, Linne. 



T. striatus, L. S.N. p. 1230: B. C. iii. p. 322; v. p. 203, 

 pi. Ixiii. f. 2. 



'Porcupine' Exp. 18/0; Atl. St. Vigo B. ; Med. Algesiras B., 

 Adventure Bank. 



Distribution. S. England, Ireland, coasts of France, Spain, Por- 

 tugal, Italy, Mge&n and Archipelago, Adriatic, N. Africa, Madeira, 

 and Canaries; 0-108 fms. 



