117 



STlfOPSIS OF THE SPECIES OF THE 

 SUB-FAMILY LIMINiE. 



G-EKUs Lima. 

 IRadial orD anient simple. 



Obliquely ovate, 25 to 30 ribs. i. Bassii. 



Ovate-trigonal, 70 ribs. L. poh/actiim. 



Radical ornament divaricate. L. lingidiformis. 



SectiojS" Limatula. 

 Badial ribs prominent. L. Jeffreysiaiia. 



Hadial striae verj numerous. L. polynema. 



GrENrs Ltmea. 

 Eibs many, obtuse, interspaces cancellated. L. transenna. 



Hibs 14, interspaces striated transversely. L. alticostata. 



Lima Bassii, Tenison- Woods. Plate v., fig. 8 ; nlate viii., fig. 1. 



'Reference. — Proc. Eoy. !Soc., Tasmania, for 1876, p. 112 

 <1877). 



Shell obliquely subovate, somewhat compressed, rather solid, 

 rayed with from 25 to 30 imbricately squamose ribs ; margin 

 fuJl and equally rounded with a prolonged curve, post-dorsal 

 dde short and very slightly concave, almost margined through 

 its whole extent by a small obtuse-angled auricle, which 

 is radiately and squamosely ribbed ; anterior side, with an 

 obsolete auricle, truncated with a straight sloping line; luuule 

 rayed with granular ribs. Umbos acute, and only slightly 

 arched. Hinge line narrow, lateral margins of hinge area 

 w4th a small denticle. The ribs vary much in number, irre- 

 spective of size of shell, as few as 21 and as many as 34 have 

 been counted ; they are usually flatly rounded with narrower 

 interspaces, but specimens from the Eiver Murray cliffs have 

 subangular ribs ; the interspaces are transversely striated or 

 lamellate, or, as in the case of examples from the Lower 

 Aldinga series, obliquely sculptured. 



Dimensions of figured specimens. — PI. 5., fig. 8, dorso- ventral 

 diameter 31'5, lateral diameter 27, thickness through both 

 valves 5 millimetres ; pi. 8., fig, 1, the respective values are 30, 

 26, and 5. Diameters of largest specimen IL and 33. 



Localities. — Type-form with rounded ribs and transverse 

 sculpture between. Table Cape {B. M. Johnston .') ; Muddy 

 Creek (i?.T.). 



Var. a with subangular and transverse lamellae between. 

 Middle Murravian series near Morgan and Blanchetown {R.T.). 



Var. b with flatly rounded ribs and oblique sculpture between. 

 -Crlauconitic limestone, Aldinga Bay ; glauconitic sands, Ade- 

 laide-bore {B.T.). 



L. Bassii so closely approximates to L. sq^uamosa, or the so- 



