Text Appearing Before Image: 1. Marpolia aequalis Walcott 2. Wahpia mimica Walcott 3. Dalyia nitens Walcott 4. Dalyia racemata Walcott SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 87, NO. 6, PL. 66 Text Appearing After Image: DALYIA RACEMATA Walcott NO. 5 MIDDLE CAMBRIAN ALGAE 257 DESCRIPTION OF PLATE 56 PAGE Dai.yia racemata Walcott (See pi. 55) 238 Fig. I. (X2.) A group of stems with branches and whorls enlargedon a smaller scale than the specimens represented byfigs, la, lb, and if. U. S. National Museum, CatalogueNo. 35419. \a, lb. (X3-) Specimens illustrating variation in the mode ofbranching. The center upper stipe of fig. la results,I think, from the pressing together of a number of shortbranchlets. This tendency is shown in fig. ic. U. S.National Museum, Catalogue Nos. 35420, 35421. ic. (X4-) Specimen with closely grouped branchlets on the ter-minal whorls which suggest the specimen illustrated byfig. 4, pi. 55. U. S. National Museum, Catalogue No.35422. The specimens represented on this plate are all from locality 35k,Middle Cambrian: Burgess shale member of the Stephen forma-tion; on the west slope of the ridge between Mount Field andWapta Peak, 1 mile (1.6 km.) northeast of Burgess Pass, aboveFi
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