340 PLIOCENE MOLLUSCA. 



Distribution. — Not known living. 



Fossil: Coralline Crag : Boy ton. 



Remarks. — On Plate XII, fig. 8, I figured a specimen which came to me from 

 the Ipswich Museum as Murex to'rtuosus, a name which I adopted for it without 

 sufficient consideration. I now think not only that it has no connection with that 

 species, but that it belongs to another group of the Muricidse, the sub-genus 

 Pteropurpura, Jousseaume (Pteronotus, Swainson), distinguished by its three wing- 

 like varices and other characters which separate it from the Ocinebra tortuosa of 

 the Crag. Since then, moreover, I have received a specimen from the York 

 Museum, obtained at Boyton, which seems to be the same. These shells belong to 

 a group from the Miocene of the Vienna basin, figured by Homes (Foss. Moll. 

 Tert. Wien, vol. i, p. 24 ( ,>, pi. xxv, figs. 11 — 16), one of them being erroneously 

 identified with Murex tortuosus, which, as stated on p. 125, is not typical of the 

 Crag species. One side of the present fossil, the back, shows very clearly its form 

 and sculpture, the other side, that of the mouth, being covered by a growth of 

 Hy dr actinia ; fortunately that portion of the shell is well exposed in the one 

 before figured (PL XII, fig. 8). In the latter, however, the wing-like varices are 

 not so well preserved. I retain the name boytonensis as specific (used before as 

 varietal) for the present form. 



Sub-genus ALIPURPURA, Bayle, 1884. 



Murex (Alipurpura) elegantula, sp. nov. Plate XXXV, fig. 20. 



Specific Characters. — Allied to the sub-genus and to the shell last described, but 

 differing in size, sculpture, general appearance, and especially in the non-continuous 

 ■character of the varices which end in well-marked and spiny projections ; it is a 

 slender and delicate shell ornamented by numerous spiral ridges and exceedingly 

 fine longitudinal lines ; mouth pyriform, contracted where it joins the canal, which 

 is rather long, semitubular and nearly closed ; outer lip crenulated, with a strong 

 triangular sinus above corresponding with the spine which terminates the varicose 

 rib ; columella large, smooth, detached from the canal. 



Dimensions. — L. 29mm. B. 15 mm. 



Distribution. — Not known living. 



Fossil: Coralline Crag : Boyton. 



Remarks. — The name Alipurpura is used by M. Cossmann for a sub-genus of 

 Murex, a group of shells closely allied to Pteropurpura {Pteronotus) in which the 

 varices are discontinuous, ending in a spiny point. It ranges as a fossil from the 

 Eocene to the Pliocene, and is recorded also as a recent genus. 



The specimen here figured under the above specific name is also from the 



