300 FrecUrick Chapman : 



Xestoleheris carta, G. S. Brady sp. 

 Cytheridea (?) curta, G. S. Brady, 1865, Trans. Zool. Soc. 

 Lond., vol. v., p. 370, pi. LVIIL, Figs, la, b. Xestole- 

 heris curta, G. S. Brady, 1880, Rep. Chall. Zool., vol. I., 

 pt. III., p. 126, pi. XXXI., Figs. &a-d. 

 The distribution of this species at the present day is the W. 

 Indies, the S. Pacific and the Southern Ocean. At Port Jackson 

 it is found at 2-10 fathoms. Our specimen is narrower than 

 usual in side view, but it has the characteristic, truncated pos- 

 terior margin. 



One example from the Filter Quarries. 



(?) Cythero'pteron angustatuin, G. S. Brady. 



(?) Cytheropteron angustatum, G. S. Brady, 1880, Rep. Chall. 

 Zool., vol. I., pt. III., p. 137, pi. XXXIV., Figs. 5«, h. 



Recent examples of this form have been dredged at Balfour 

 Bay, Kerguelen Id., at 20-50 fathoms ; and at Torres Strait, 

 155 fathoms. 



One valve from the Filter Quarries. 



Cytheropteron hatesfordiense, sp. nov, Plate II., Figs. la-c. 



Description. — Carapace seen from the side, elongate ovate ; 

 anterior truncately rounded at the dorsal angle, posterior pro- 

 duced at the ventral angle, the extremity sub-spinose ; anterior 

 and ventral margins keeled ; dorsal line broadly arched, ven- 

 tral, sinuous. Lateral alae pronounced, long and gently 

 curved. Carapace thickest at the middle of the ventral margin, 

 rapidly sloping to the extremities and the dorsal border. Sur- 

 face of carapace finely pitted. Edge view, ovate, compressed 

 at the extremities. End view, sub-triangular. Height of cara- 

 pace equal to about half the length ; thickness of carapace more 

 than half the length. 



Length, 1mm. ; height, .62mm. ; thickness of, carapace, 

 .655inm. 



Affinities. — This species is quite distinct from C. welling 

 toniense,^ G. S. Brady, although showing some relationship in 



1 Rep. Chall. Zool., vol. i., pt. iii., 1880, i>. 136, }>1. xxxiv., fij^s- 4«-f^- 



