1867.] MR. G. F. ANGAS ON AUSTRALIAN MOLLUSCA. 21 1 



Fam. VERMETIDyE. 



152. Thylacodes decussatus. 



V. decussatus, Gmel. 



A grotesquely twisted tubular shell, longitudinally squamately 

 ridged, adhering by the under surface of the spire to blocks of sand- 

 stone and rocks at low water. Length 2 or 3 inches, diameter of 

 tube 6 lines. 



1.53, BlVONIA QUOYI. 



Bivonia quoyi, A. Ad. 



Spirally tubular, smooth, agglomerate, and not attached to stones. 

 Dredged in Port Jackson. Length 2 inches, diameter of tube 3 Hnes. 



Fam, Calyptrid^. 



154. Trochita (Haliotidea) calyptr^formis. 



Trochus calyptrceformis. Lam. Anim. sans Vert. vii. p. 627. 



Calyptrcea lamarcki, Desh. 



Crepidula tomentosa, Quoy et Gaim. 



Attached to stones at low water in Port Jackson. Breadth 9 lines. 



155. Galerus pellucidus. 



Trochita pellucida, Reeve, Conch. Icon. pi. 1. f. 2. 



A small, white, semitransparent species, not unlike the European 

 G. chinensis, or "Chinaman's hat." Adhering to dead shells in 

 deep water in Port Jackson. Breadth 4 lines. 



156. Crypta (Crepipatella) aculeata. 



Crypta aculeata. Lam. Anim. sans Vert. vii. p. 642. 



Patella aculeata, Gmel. 



Covered on the outside with rows of prickly scales, dark inside. 

 Found attached to rocks at low water in Port Jackson. Length 

 1 inch. 



157. Crypta (Ianachus) unguiformis. 



Crepidula unguiformis, Lam. ; Brod. Trans. Zool. Soc. i. p. 204, 

 pi. XXIX. f. 4. 



Adhering to dead shells. Whitish, smooth, flat, and very variable 

 in form. This species is almost worldwide. Length 1 inch 3 lines. 



Fam. Capulid.e. 



158. COCHLOLEPAS ANTIQUATA. 



Patella antiquata, Linn. 

 Pileopsis mitrula. Lam. 



1 Hlpponyx foliacea, Quoy, Voy. de I'Astrol. pi. 72. f. 41-45. 

 Shell flatly conical, with a foliaceous epidermis. Under rocks and 

 stones in Port Jackson. Breadth 7 lines. 



