]84 PLIOCENE MOLLUSCA. 



Wood figured a shell from Bridlington as Trophoii Sahiuii, Hancock, which 

 however he believed to be, as I do, a different species ; I give it on p. 199 as S. 

 exiguus. 



S. Sabinii is one of the shells Mr. Friele included in 1882 in his curtus group. 

 It appears, however, that Jeffreys considered it in 1877 and again in 1883 to be 

 distinct from the Crag fossils for which he had originally proposed the latter 

 name. 



It differs from *S*. togiitus in form, in its finer sculpture, its sligliter suture and 

 the less convexity of the whorls. 



Prof. Br^gger' and Dr. 0yen regard S. Snhinii, however, as a variety of S. 

 togatus. The latter has kindly sent me from the Yoldlri-c\aj of Grettinge a specimen 

 nnder the latter name which corresponds very nearly with onr Crag shells. 

 Althongh allied, I am disposed to regard the two forms as different species. The 

 specimens I have fonnd at Oakley maintain the same general character ; none of 

 them show any sign of approaching what I regard as the typical form of S. togatus. 

 In Crag times, as far as our information goes, these shells seem to have been 

 distinct. It is an interesting fact that both should have remained so, unchanged 

 from the Pliocene period to the present day. 



Messrs. Dautzenberg and Fischer in their recent work (p. 01), often referred to 

 in this Memoir, remark that it is almost impossible to say what the unfigured 

 Bnccinmn Sahiuii of Gray really was. It was originally stated to be ventricose. 

 having five convex whorls, longitudinally rib-striated, finely transversely wrinkled, 

 18 mm. in length, and 9 mm. in diameter, a description which seems somewhat 

 inapplicable to the present shell. They suggest, indeed, as does Kobelt, that it 

 was Troschelia {Buccinofusus) J>ermciensis. Our .Crag fossils agree at any rate with 

 the shells afterwards and for the first time figured by Hancock and by Jeffreys, 

 which were regarded by them as the type of 8. Sahiuii. 



Sipho Herendeenii (Ball). Plate XXII, fig. 11 ; Plate XXV, figs. 8, 9. 



1902. Tritonofusus (Plicifustis) Herendeenii, Dall, Proc. U.S. Nat. Mus., vol. xxiv, p. 527, ])1. xxxvi, 

 fig. 10. 



Specific Characters. — Shell solid, fusiform, turreted ; whorls not so convex as in 

 the typical form of S. togatus; ornamented by well-marked and regular spiral 

 ridges, closel}^ crowded together on the upper whorls, divided by a thin medial 

 line on the lower, with fine intermediate lines in places towards the base of the 



1 The minute shell figured by Prof. Br0gger as Tritonitim Sahinii (o}). cit., pi. xviii, fig. 2) differs 

 from those here given under that uauie, and may perhaps be a dwarf form of S. togatus, as he suggests. 

 Prof. Leches S. Sahini (K. Svensh. Veten. Akad. H:indl., vol. xvi, p. 69, pi. i, fig. 23) seems also 

 different. 



