18G7.] MR. G. F. ANGAS ON NEW AUSTRALIAN MOLLUSCA. 911 



MODIOLARIA BARBATA, n. S. (PI. XLIV. fig. 12.) 



Shell small, oblong-ovate, more or less convex, whitish, covered 

 with a yellowish-green horny epidermis, which becomes long, thick, 

 and fibrous posteriorly ; the valves very finely concentrically irregu- 

 larly striated, and decussated with elevated radiating ribs, which are 

 obsolete near the middle. 



Long. 5, alt. 2, lat. \\ lines. 



Hab. Botany 13ay, New South Wales. 



OSTREA VIRESCENS, n. s. (PL XLIV. fig. 13.) 



Shell solid, orbicular, inequivalve, with the margins of the valves 

 crenulately frilled. Superior valve smaller, flattened, radiately 

 plicate, and laminately scaled, whitish, irregularly striped with 

 purplish brown ; inferior valve larger, the cavity deep ; interior 

 greenish olive, paler at the margins ; cardinal area large, triangular, 

 and flattened. 



Long. If, lat. ly inch. 



Hab. Attached to rocks and madrepores at low spring tides at 

 Watson's Bay, Port Jackson. 



•^ h lif'i'i Crossea concinna, n. s. (PL XLIV. fig. 14.) 



Shell narrowly umbilicate, turbinate, rather solid, white, semipel- 

 lucid ; spire raised, suture distinct ; whorls five, rounded, the first 

 three transversely ribbed and longitudinally striated, the remainder 

 transversely punctate-striate ; umbilicus bordered by a rounded cal- 

 lus ; aperture circular, with a channelled angular projection in front; 

 outer lip simple, the margin acute. 



Diam. 2 lines, height ly. 



Hab. " Sow and Pigs" reef. Port Jackson, from 2 to 4 fathoms. 



This species has much the form of C. bellula, A. Ad., but differs 

 in size, being considerably larger, and in the sculpture of the whorls; 

 the angular projection of the aperture also is not so strongly deve- 

 loped. The only two species of the genus hitherto known were ob- 

 tained by Mr. Arthur Adams from the Gotto Islands in Japan. 



DESCRIPTION OF PLATE XLIV. 



Fig. 1. Alicia angustata, p. 908 

 eleganhda, p. 908. 



o 



3. Tltracia modesta, p. 908. 



4. Dosinia jMclla. p. 909. 

 t). Sunetta adelina, p. 909. 

 G. SjMSula crefacea, p. 909. 

 7. froducta, p. 909. 



Fig. 8. Loripes assimilis, p. 910. 

 9. Felania adamsi, p. 910. 



10. jacksoniensis, p. 910. 



11. Lepton adamsi, p. 910. 



12. Modiolaria barhata, p. 911. 



13. Ostrea vircsecns, 1^. Q\\. 



14. Crossea concinna, Tp.^W. 



