Dr. P. P. Carpenter on new Forms of Mollusca. 428 
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 published, with the neces- 
sary figures, in Pringsheim’s ‘ Annalen.’ 
XLVI.—Diagnoses of new Forms of Mollusca from the Vancouver 
District. By Purp P. Carpenter, B.A., Ph.D. 
Tue shells here described were mostly collected by Indian chil- 
dren for their excellent teacher Mr.J.G.Swan, m the neighbour- 
hood of Neeah Bay, W.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 m the 
British Association Report for 1863, pp. 626-628; see also 
pp: 636-664. 
5. Mara salmonea. 
‘M. testa parva, solida, compacta, subquadrata ; levi, nitente, epi- 
dermide tenui cinerea induta ; extus pallide, intus vivide salmoneo 
tincta; marginibus dorsalibus rectis, ad angulum 120° separatis, 
umbonibus haud extantibus ; marginibus antico et ventrali regu- 
lariter late excurvatis; parte postica brevissima, haud angulata: 
intus, dent. card. utraque valva il., quorum unus bifidus ; laterali- 
bus vy. dextr. sequidistantibus, ant. extante, post. parvo; nymphis 
rectis, haud conspicuis ; cicatr. add. post. subrotundata, ant. sub- 
rhomboidea; sinu pallii satis regulariter ovali, 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. EH. E.); Neeah Bay (Swan), 
plentiful; Monterey, 20 fathoms (Cooper). 
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. Angulus variegatus. 
A. testa forma A. obtuso simili, sed costa interna omnino carente, 
valde ineequilaterali, solidiore, nitente, rosaceo et flavido subradia- 
