REPORT ON THE LAMELLIBRANCHIATA. 289 



This species, whicli T cannot separate from Liiaa caflhaa, is said to be Mediterranean 

 by Mr. Sowerby, and he is probably correct. In the British Museum there are specimeu.s 

 from Port Stephens, Eaine Island, Torres Strait, and Kangaroo Island, \vhi(;h ai)pear to 

 be absolutely identical in every respect. It resembles Lima squamosa in form, but ha.s 

 many more and finer ribs, whicli have more delicate prickles n})nn tlicm. 



Lima tahitensis, n. .sp. (PI. XXIV. figs. 4-4a). 



Testa brevis, oblicjue subqnadrata, compressa, ingequilateralis, all)a, antice excavata, 

 costis ad quindecira spinis erectis cavis elongatis pulcherrime ornatis instructa, in 

 interstitiis liris concentricis prsecipuc umbones versus fortibus cancellata. Auriculre 

 valde insequales, anticaj fere obsoletiie. Area dorsalis angusta, parva, excavata. Pagina 

 interna nitida, radiatim sulcata. 



Length 9 mm., height 10, diameter 4^. . " 



Habitat. — Tahiti, in 30 to 40 fathoms. 



This charming little shell differs from Lima squamosa in its shorter and squarer 

 form, fewer ribs, more erect and longer spines, and the coai'ser liras between the costa;, 

 especially near the umbones, where they give quite a cancellated appearance to the valves. 

 The anterior slope is a little concave, and ornamented with a few minutely prickled 

 lirse. 



Lima angulata, Sowerby. 



Lima angulata, Sowerby, Thesaurus, vol. i. p. 86, pi. xxii. figs. 39, 40. 



Lima angulata, Sowerby, Concb. Icou., vol. xviii. pi. iii. fig. 1 3. 



Lima hasilanica, Adams and Reeve, Voy. "Samarang," p. 75, pi. xxi. fig. G. 



Lima orientalis, Adams and Reeve, op. cit., p. 7.5, pi. xxi. fig. 7. 



Radula {Munti'Unm) angulata, Angas, Proc. Zool. Soc. Lond., 1865, [i. 056. 



Radula {Mantellum} orieritahs, Angas, oji. cit., 1871, p. 101. 



Habitat. — Port Jackson, New South Wales, in 2 to 7 fathoms (Challenger) ; Panama 

 and Bay of Carracas, in 10 to 12 fathoms (Sowerby) ; Philippine Islands (Adams and 

 Reeve) ; Port Lincoln (Angas). 



I do not see any sufficient reasons for separating the above-named forms, and 1 

 believe that the Lima fasciata of Sowerby {nee Linn.) is probably also merely a large and 

 rather coarsely sculptured variety of this species. The outline is very like in all 

 of them. 



(zool. CHALL. EXP. PART XXXV. 188.''i.) Mm 37 



