70 Frederick Cha'pm<(Ai: 



Fig. 41. — Cytheropteron rosfratum, sp. nnv. a. Carapace seen 



from left side; h, profile from l)t'lo\v. Mallee Bore, 



No. 11, 175-197 feet, x 52. 

 Fig. 42. — Cytherelht auriculus, sp. nov. a, Left valve; h, profile. 



Mallee Bore, No. 11, 210-260 feet, x 52. 

 Fig. 43. — C. auriculus, sp. nov. Left valve of a young example. 



Mallee Bore, No. 11, 219-260 feet, x 52. 

 Fig. 44. — Cytherella lata, G. S. Brady, a. Left valve; J>. profile. 



Mallee Bore, No. 5, 163-175 feet. x 52. 

 Fig. 45. — Cytherella polita, G. S. Brady, a. Left valve: A, profile. 



Mallee Bore, No. 9, 315-325 feet. x 52. 

 Fig. 46. — Cytherella pulchra, G. S. Brady, a. Bight valve; i, 



profile. Mallee Bore, No. 10, 230-254 feet, x 52. 

 Fig. il.— Cytherella jmtietata, G. S. Brady. Left valve. Mallee 



Bore. No. 9, 256-263 feet, x 52. 

 Fig. 48. — Cytherella xuhtruncata, sp. nov. r^ Carapace seen 



from tlie left side; />, carapaee seen from below. 



Mallee Bore, No. 10, 225-230 feet, x 52. 



Plate X. 



Fig. 49. — Scalpelluin suhquadratuni, sp. nov. a. Carina. dc>rsal 

 view; />, lateral view; c, interioi- of valve; «•/. section 

 across posterior end of valve (Holotype). Mallee Bore, 

 No. 4, 163-170 feet. x 2. 



Fig. 50. — .V. suJxpiadratmiK sp. nov. (?) Rostral latus (Paratype). 

 Mallee Bore, No. 10. 310-320 feet. x 2. 



Fig. 51. — S. Kulx/iiadraf iiin, sp. nov. Scutum: a, exterior; h, 

 interior of valve (Pai-atype). Mallee Boi-e. No. 4, 

 163-170 feet. X 2. 



Fig. 52. — Balaniis j)sitfariis, Molina sp. llosti-al compartment : a. 

 exterioi' ; l>, interior, showing strongly denticulated 

 septa of tlie radii. ^Nlallee Bore. No. 9, 315-325 feet. 

 X 2. 



Fig. 53. — Balariiis rar/ans, (t. S. Sowerby. A complete l)ase. 

 Mallee Bore. No. 9, 315-325 feet. x 2. 



Fig. 54. — B. variaii>f, Sowerliy. A carinal valve. Malice Bore, No. 

 9, 315-325 feet. x 2. 



Fig. 55. — Cestrarion ca/nozoirm^. Chapman and Priti'liard. An- 

 terior lateral tooth. Mallee Bore, No. 8, 210-219 feet. 

 X 4. 



