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



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

 Fossil. Pliocene : Coralline Crag, Sutton. 



V 2.5. TROcHt's 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 {Monterosato) ; about 22 fms. 



Fossil. Pliocene : Coralline Crag, Sutton. 



The specimen from Algesiras Bay is sculptured spirally and 

 coarsely, like (he 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 striae 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'Eichwakl (' Lethaea Rossica,' iii., derniere periode, p. 226, 

 esp. 199, pi. ix. f. 15, ff, 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. 

 \y 26. Trochus montacuti, {montagui) W. Wood. 



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

 T. montucuti, 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. parvulua, 

 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. 1870; Atl. St. Vigo B. ; Med. Algesiras B., 

 Adventure Bank. 



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

 tugal, Italy, ^gean and Arcliipciago, Adriatic, N. Africa, Madeira, 

 and Canaries; 0-108 fms. 



