84 PLIOCENE MOLLUSC A. 



having a well-marked roAY of thread-like denticulations within, 1 mm. in length ; 

 canal open, verj short. 



Dimensions. — L. 16 — 18 mm. B. 8 mm. 



Dlsfrihvfion. — Not known living. 



Fossil : Coralline Crag : Boyton. AValtonian : Little Oakle^'. 

 Scaldisien : Belginm. Pliocene of Iceland. 



Remavhs. — There is a perfect specimen of this very distinct form in the British 

 Musenm (Natural History) which corresponds with the shell originally figured l)y 

 Nyst, and with one from Antwerp, kindly sent me by M. van de Wouver ; I have, 

 moreover, received some from Dr. Ravn of Copenhagen from the Morcli collection 

 of Iceland Crag fossils, Avhich are evidently the same, although referred in error 

 to N. nwnensis. That species, howQver, is very different as previously shown 

 (PI. IV, fig. 7). N. lamellllahra seems allied to N. mnsira,'Brocclu, a characteristic 

 form of the LTpper Pliocene deposits of Italy. 



Var. elegantula (S. V. Wood, MS.), nov. Plate IV, figs. 14—10. 



1871. Nassa pidchella, A. Bell, Auu. Mag. Nat. Hist. [4], vol. vii,p. 3.55. 



1872. Nassa fnlchella, S. V. Wood, Mon. Crag Moll., 1st Suppl., p. 13, tab. vi, fig. 7. 



1877. Nassa monensis, Morcli and Poulseu, plates and MS. list iu Geological Museum, Copenhagen, 

 no. 28, tab. iv, fig. 3 (unpublished). 

 — Nassa elegantula, S. V. Wood, MS., Ipswich Museum. 



Dimensions. — L. 12 — 14 mm. B. 6 — 7 mm. 



Distribution. — Coralline Crag : Gedgrave, Boyton. Waltonian : Little Oakley. 

 Newbournian : Waldringfield. Scaldisien : Belgium. Iceland Crag. 



Remarks. — One of the shells figured under this name is from the Ipswich 

 Museum, and comes from the Coralline Crag. It is accompanied by a note in 

 Wood's writing, "Nassa elegantula." I have examples in my OAvn collection of the 

 same kind, two or three from Oakley, and another from Antwerp; it also occurs 

 among the specimens from the Iceland Crag. 



It differs from N. laweililahra in size, form, and somewhat in sculpture, but 

 may be regarded, I think, as a variety of that species. The mouth in both cases 

 is very characteristic and differs from anything else in the Crag. One of the 

 Oakley specimens (fig. 15), which is worn and has nearly lost the external sculpture, 

 shows this feature distinctly. The present variety appears to correspond with the 

 shell described by Mr. A. Bell in 1871 as N. 2»dchella, of which he remarks that 

 it is deeply striated or grooved, as well as with that figured by Wood, b}^ whom it 

 was referred to a Russian fossil figured by Andrzejowski under the same name.' 

 The latter, however, appears to he a different species. 



Nyst, in his Monograph of 1878, makes no mention of N. pulchella, and as the 

 1 Bull. Soc. Imp. Nat. Moscou, vol. vi, p. 438, pi. xi, fig. 2, 1833. 



