REPORT ON THE LAMELLIBRANCHIATA. 115 



varied with very little of the network markings which occur in both forms. Towards the 

 outer margin, however, they are more prevalent and of the same violet colour as in Tapes 

 undulata. The luuule also in these Port Jackson specimens is narrower than in typical 

 examples of Tapes textrix, the dark red-brown lines upon this part and the dorsal area 

 being likewise less vivid. Another feature in which they difier from the typical form is 

 in the margins of the valves being thinner, in this respect more resembling Tapes undulata 

 than Tapes textrix, the latter having peculiarly smooth and much thickened edges. Thus 

 it will be seen that the shells under examination in some characters are very like Bora's 

 species, still they have not the slightly oblique striae upon the middle of the valves, 

 which is so characteristic a mark of that form, nor are they c[uite so narrow at the 

 extremities. 



Tapes textrix is found on the Malabar coast (Chemnitz), Andaman Islands (E. 

 Hamilton, in Brit. Mus.), and probably other places in the Indian Ocean. 



Tapes (Paratapes) undid ata (Born). 



Venus undulata. Born, Test. Mus. Csesar. Vindobon., p. G7. 

 Tapes undulata. Reeve, Concli. Icon., vol. xiv. fi;,'. 8. 

 Tapes {Textrix) •undulata, Romer, Mouogr., p. 20, pi. v. fig. 2. 

 Verms rimosa, Philippi, Abbild., vol. iii. p. 77, pi. vii. fig. 7. 

 Tapes rimosa, Sowerby, Thesaurus, vol. ii. p. G82, pi. cxlvi. fig. 29. 



Habitat. — Station 189, Arafura Sea, in 25 fathoms; also Station 233a, off Kobe, 

 Japan, in 8 to 50 fathoms. 



This species has already been recorded from Japan and China, and in the British 

 Museum I find specimens collected at Ceylon by E. W. H. Holdsworth, Esq. Although 

 closely resembling Tapes textrix it is well distinguished by the difference of sculpture. 



Tapes [Paratapes) semirugata (Philippi). 



Venus semirugata, Philippi, Abbilil., vol. iii. p. 76. ])1. vii. fig. 4. 

 Tapes seiniruijata, Sowerby, Thesaurus, vol. iii. p. 681, pi. cxlv. fig. 12. 

 Tapies (Textrix) semiruijata, Rdruer, Monogr., p. 29, jil. ix. hg. 1. 

 Tapes imlita, Sowerby, loc. cit., p. 682, pL cxlv. figs. 15, 16. 

 Tapes polita, Reeve, Conch. Icon., vol. xiv. fig. 49. 



Habitat. — Station 188, south of New Guinea, in 28 fathoms, on a mutl Ijottom. 



The single specimen from this locality agrees in all respects with Komer's 

 admirable description, but has the four interrupted rays rather more decided than in 

 the specimen he fig-ures. Tapes 2Jolita of Sowerby is merely the younger state of 



