168 



Cumingiana and 31. compta arise from the relative massiveness- 

 of the septum and loop ; in the former the slender loop is lost 

 in the excessively stout septum along which it may be 

 considered to be decurrent, till it becomes again free, and 

 forms the second annulus ; whereas in 31. compta the septum 

 is lost as it were in the much greater mass of the broad 

 lamella 1 of the loop, and the loop seems to be only once 

 attached to the septum. 



Dimensions of a larger specimen : — -Length, 9 ; breadth, '7 ;, 

 depth, # 5 of an inch. 



Observations. — 31. compta being the oldest described among 

 the related forms need not here be compared with them ; its- 

 salient characters may, however, be pointed out. Trapeziform, 

 contracted, depressed and biangulated in front ; hinge line 

 straight, very broad ; beak suberect ; deltidial area very large. 

 The species has hitherto been almost unknown except by 

 Sowerby's figures and descriptions, as the common shell which 

 is commonly referred to it, is a distinct though allied species. 

 Figs, ia and 4<b of Mr. "Woods' paper, op. cit., doubtlessly 

 represent Sowerby's shell ; but his fig. 4c agrees well with 

 31. Wbodsiana, mini, and I strongly suspect that the interiors 

 shown by figs. 4>d and 4e belong to the same. A comparison of 

 the original figures of T. compta, and those of T. compta, 

 Etheridge, op. cit., cannot fail to convince one that two species 

 are represented by them. 



Locality and Horizon. — Not rare in the Lower Murravian 

 beds at Mannum on the B. Murray, and near Callington, on 

 the E. Bremer. Eare at Stansbury, Surveyor's Point {Tate), 

 at Muloowurtie, Torke's Peninsula (Tepper) ; Mount Gambier, 

 South Australia, and Portland, Victoria (Woods). 



The types were obtained " from a raised beach at Point 

 Fairy," on the Cape Otway coast, Victoria ; but as in other 

 instances, Strezlecki mistook our Older Tertiary deposits for 

 Post Tertiary beaches. 



Magasella Woodsiana, spec. nov. Plate x., figs. 3«— 3d. 



Syn. — Terebratella compta (pars), Woods, loc. cit., fig. 4c — 4e 

 (1865). 



id., Etheridge, loc. cit., 1876. 



Shell pyriformly ovate, longer than wide, margins flexuous. 

 Valves unequally convex, peduncular valve much the deeper, 

 which is longitudinally and obtusely carinate. Brachial 

 valve regularly convex in the umbonal half, medial depressed 

 towards the front. 



Beak broad and stout, slightly incurved and truncated by a 

 nearly transverse circular foramen of moderate dimensions. 

 Hinge line much arched, beak ridges sharply defined, enclosing 



