Species of Liriioi)!<ls. 421 



prominent acute and incnrved umbo. Hinge-line nearly straight. 

 Ligament pit triang-ular, well marked. Teetli, 5-9 anterior ; 

 4-7 postei'ior, unequal, median ,stronge.st. Internal margin of shell 

 broad, tint ; interior finely radiately striate. Exterior with 

 strong concentric ridges, crossed by very faint striae. Type, 

 height, 14 mm.; length, 12.5 inm. 



Distribution A — Balcombian. — Baloombe's Bay ; Grice's Creek; 

 Altona Bay Coal Shaft ; Muddy Creek (Lower Beds) near Hamil- 

 ton ; Gellibrand River ; Orphanage Hill, Geelong ; Skinner's, 

 Mitchell River, Gippsland. 



JanjuTtian. — Batesford ; near Griffin's Farm, Moorabool 

 River ; below Curdie's Steps ; Fishing point, R. Aire. 



Observations. — This species is a comparatively rare form, and 

 is not easily mistaken for any of the other species, except it be 

 the young forms of L. maccoyi. The distinguishing characters 

 of the latter are the strong radial riblets, the fimbriate ornament 

 and the greater obliquity of the shell. 



LiMOi'sis MACCOYI, sp. nov. 



(Pi. LXXXIIL, Fig 2; PI. LXXXV^, Fig; 8). 



L. helrlieri, McCoy (non Adams and Reeve), 1875, Prod. Pal, 

 Vict., Dec. IL, p. 25, pi. XIX., Figs. 8, 9. 



Relationshijjs. — Not a little confusion formerly existed regard- 

 ing the identification of the recent species of Limojjsis ascribed 

 by McCoy to L. belcJieri. This has now been satisfactorily 

 settled, so far as the living Australian examples are cojicerned, 

 by Mr. Chas. Hedley.2 Tlie name of the living form now stands 

 as L. tenisoni, T. Woods (syn. L. bassi, E. A. Smith). The 

 species />. belcheri, Adams and Reeve, is a distinct, although 

 related form, from the Cape of Good Hope. 



The fossil species common in our Balcombian strata, and 

 occasionally found in the Janjukian and Kalimnan, bears a 

 general resemhlance both to L. belcheri and L. tenisoni. It is 



1 The sequeiioe of the Balcombian and Janjukian Series here follo>ved is the same as 

 that adopted by Messrs. Tate and Deniiant, viz., the Balcombian as the older. The present 

 view is stronjfly suported by palaeontolojjical evidence from the Mallee borings now under 

 description, and also by a close study of the mierozoa of the Tertiaries of Victoria and 

 elsewhere. 



2 Mem. Australian .Mus., No. iv., 1902, p. 297. 



