268 CIESOTEEMA. 



Cirsotrema lyrata, Zittel (sp.). 



1865. Scalaria lyrata, Zittel, Eeise der Novara, Palaontologie, Bd. i. 



Abth. ii. p. 41, taf. is. fig. 8. 

 1873. Scalaria lyrata, Hutton, Cat. Tert. Moll. N.Z. p. 9. 



Shell large, solid, imperforate ; whorls convex, longitudinal, 

 twelve in number, lamellae distant from each other, thick, 

 crenulated on the edge, each covering the suture by a flattened 

 expansion which invades the preceding whorl ; spiral lineations 

 bold, with smaller ones between ; encircling thread on the anterior 

 of the last whorl prominent, the area between that and the 

 columella being comparatively smooth. 



Dimensions. — Length cannot be stated from the specimens in the 

 Museum, as they are incomplete ; Hutton gives the length (axis) 

 as 2 inches, breadth 0"95 inches. 



Form, and Loc. — Pliocene (?) : N'ew Zealand. 



G. 9696. Example of the adult, in which the spiral threads 

 are very strong, varices accentuated ; from Parimoa. 



W. B. D. Mantell Coll. 



G. 9720. Varices not so clearly marked; spiral threads smaller; 

 from Takiroa. W. B. B. Mantell Coll. 



G. 9721. Lamellae much elevated ; strongly crenulated at the 

 edges ; from Takiroa. [ Old Collection?^ 



G. 9722. Pragment of the adult, in fine sandstone; locality (?). 



\_Old Collection.^ 



Cirsotrema browni, Zittel (sp.). 



1865. Scalaria browni, Zittel, Reise der Novara, Palaontologie, Bd. i. 



Abth. ii. p. 42, taf. ix. fig. 9. 

 1873. Scalaria browni, Hutton, Cat. Tert. Moll. N.Z. p. 9. 



Shell elongate ; whorls convex, strongly variced, longitudinal 

 lamellae relatively smaller than in C. lyrata and closer together; 

 strongly spirally lineate, causing subcancellation ; last whorl 

 keeled, the area enclosed between the keel and the columella 

 being flattened and comparatively simple. The bad preservation 

 of the shell does not permit of the detail being satisfactorily 

 made out. 



