Page:Walcott Cambrian Geology and Paleontology II.djvu/286

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204
SMITHSONIAN MISCELLANEOUS COLLECTIONS
VOL. 57

Alimentary canal.—This canal is large and may be traced from the last abdominal segment through and into the head as shown in figure 9.

Dimensions. mm.
Length of body 40
Caudal spine 30
Head 9
Thorax 26
Abdomen 4

Fig. 8.—Emeraldella brocki, n. sp. Dorsal view of a flattened specimen. ✕ 1.5, showing antennules, antennæ, 3 posterior cephalic appendages, epistoma, and position of mouth.

Observations.—The specific name is given in honor of R. W. Brock, Director of the Geological Survey of Canada, who has been