Dr. P. P. Carpenter on new Forms of MoUusca. 423 



root subsequently beneath. The root then penetrates into the 

 soil, the prothallium having been fastened to the surface by its 

 rootlets. The foot beneath is intimately adherent to the tissue 

 of the prothallium, and stretches over the upper opening of the 

 spore, for the purpose of taking up its nutritive material and 

 handing this over to the other parts of the germ. The young 

 bud remains long concealed ; but when it subsequently breaks 

 out, the cast remains of the prothallium perish. 



The more particular description of the entire process of de- 

 velopment, especially the cell-division of the germ, the appear- 

 ance of the vascular bundles and of the later roots, and the 

 evolution of the leaves, will shortly be pubUshed, with the neces- 

 sary figures, in Pringsheim's ' Annalen.' 



XL VI. — Diaff noses of new Forms of Molltisca from the Vancouver 

 District. By Philip P. Carpenter, B.A., Ph.D. 



The shells here described were mostly collected by Indian chil- 

 dren for their excellent teacher Mr. J. G. Swan, in the neighbour- 

 hood of Nceah Bay, AV. T. They were presented by him to the 

 Smithsonian Institution, Washington, D.C. ; and, in accordance 

 with their liberal policy, the first available duplicates will be 

 found in the British Museum or in Mr. Cuming's Collection. 

 The species are numbered to correspond with the list in the 

 British Association Report for 1863, pp. 626-628; see also 

 pp. 636-664. 



5. Meera salmunea. 

 M. testa parva, solida, compacta, subquadrata ; Isevi, nitente, epi- 

 demiide tenui cinerea induta ; extus palUde, intus vivide salmoneo 

 tincta ; margiuibus dorsalibus rectis, ad angulum 1 20° separatis, 

 umbonibus baud extantibus ; margiuibus antico et ventrali regu- 

 lariter late excurvatis ; parte postica brevissima, baud augulata : 

 intus, dent. card, utraque valva ii., quorum unus bifidus ; laterali- 

 bus V. dextr. ajquidistantibus, ant. extante, post, parvo ; nymphis 

 rectis, baud conspicuis ; cicatr. add. post, subrotundata, ant. sub- 

 rhomboidea; sinu pallii satis regulariter ovaU, per iv. inter v. 

 partes interstitii porrecto. Long. •57, lat. '45, alt. '11 poll. 

 Variat testa aurantiaca, rarius albida, rosaceo tincta. 



Hab. San Francisco {Pac. Rail. E.E.); Neeah Bay {Swan), 

 plentiful; Monterey, 20 fathoms (CoopCT-). 



In shape almost close to Macoma crassula, Desh. (Arctic) ; 

 but that species is thinner, not glossy or salmon-coloured, and 

 has no lateral teeth. 



6. Angultts variegatus. 



A. testa forma A. vbtuso simili, sed costa interna omnino carente, 

 valde iuKquilaterali, solid iore, nitente, rosaceo et flavido subradia- 



