34 R. BULLEN NEWTON on 



equi-distantly and spirally ridged and crossed by microscopically fine, close 

 longitudinal striations, the spiral sculpture of the central part of the body- 

 whorl being sometimes more or less obsolete, one or two whorls immediately 

 succeeding the protoconch bear a series of equi-distant longitudinal costae. 



DIMENSIONS. 



Adult. Young. 



Alt. ... ... ... ... ... 27 ... 9 millimetres. 



Lat 18 ... 6 



REMARKS. Numerous specimens represent this form of Strepsidura, which 

 is distinguishable from other species on account of the predominance of the 

 spirally ridged ornamentation of the external surface, the longitudinal striations 

 being much less evident because of their microscopically fine structure. 

 Although the spiral sculpture is usually continuous over the whole shell, with 

 the exception of the protoconch which is smooth, there are some examples 

 exhibiting a smoothness in the central region of the body-whorl where the 

 spiral lines are more or less obsolete, a character probably due to erosion. 

 In the British and European Eocene shell, Miirex turgidus, Solander, which 

 is the type of Swainson's genus, Strepsidura, it is noticeable that the columella 

 is biplicated, that there are no spiral ridges above the folds on the columella, 

 and that the predominant sculpture in well preserved specimens consists of 

 distant, more or less swollen, longitudinal costae whereas the spiral striations 

 are extremely fine and much less prominent. 



OCCURRENCE. Cuttings Nos. i, 5, 6, 10, 12, 13, 15. 

 COLLECTOR. Mr. Kitson. 



Family TURBINELLID^. 

 Gornulina minax (Solander). 



PLATE 3, figs. 6, 7. 

 Murex minax. 



Solander, Brander's : Fossilia Hantoniensia, 1766, pi. 5, fig. 62, p. 30. 



Fusus minax. 



Deshayes : Desc. Coq. Foss. Paris, 1835. Vol. 2, pi. 77. figs. 1-4, p. 568. 



Cornulina minax. 



Conrad: Proc. Acad. Nat. Sci. Philadelphia, 1853, Vol. 6, p. 321 ; Cossmann : Essais de 

 Pateoconchologie Comparee, 1901, part 4, pi. 4, fig. 5, and pi. 5, fig. 10, pp. 87, 88. 



REMARKS. The collection contains a small (25 x 18 mm.) and well 

 preserved example of this species although its terminal regions are imperfect. 



