. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 36 Annals of the Carnegie Museum. toward the front and reaches the anterior margin, the form of the hypo- stoma, and the absence of spines at the genal angles. In all these points (except in the form of the hypostoma) Isoteloides is unlike Fig. I. Isotelus gigas Dekay. Outline drawing of young specimen, for com- parison with fig. 4. Fig. 2. Asaphus expansus (Linne). Compare proportions of cephalon and shape of glabella with i and 4. Fig. 3. Asaphus expansus (Linne). Side view of an
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 36 Annals of the Carnegie Museum. toward the front and reaches the anterior margin, the form of the hypo- stoma, and the absence of spines at the genal angles. In all these points (except in the form of the hypostoma) Isoteloides is unlike Fig. I. Isotelus gigas Dekay. Outline drawing of young specimen, for com- parison with fig. 4. Fig. 2. Asaphus expansus (Linne). Compare proportions of cephalon and shape of glabella with i and 4. Fig. 3. Asaphus expansus (Linne). Side view of an enrolled specimen. Notice the lack of a concave border round the cephalon and pygidium. 2 and 3 after Salter. Fig. 4. Isoteloides whilfieldi Raymond. Outline drawing of a specimen in the Carnegie Museum. Isoteloides agrees with Isotelus in having the dorsal furrows and neck ring very faint on the cephalon, in the almost entire absence of segmenta- tion on the pygidium, in having a depressed border on the pygidium, and in the presence of spines at the genal angles. It differs from Isotelus in the form of the hypostoma, in having a defined glabella and a median tubercle, and in having a narrow axial lobe. Isotelus angusticaudus Raymond of the Chazy and Asaphus homalno- toides Walcott of the Black River and Trenton appear to belong to this genus. Isoteloides whitfieldi nomen nov. Plate XIV, figures 1-4. Asaphus canalis Whitfield, Bulletin American Museum Natural History, I, 1886, 336, pi. 34. figs. x-8. (not of Conrad or Hall).—Whitfield, Bulletin American Museum Natural History, II, 1889, 64, pis. 11, 12. Not Asaphus or Isotelus canalis of Conrad, Hall, Billings, Clarke, Cleland, or Weller. The first mention of the specific name canalis as applied to an Asaphid was by Hall in the "Paleontology of New York," Vol. I, p. 25. Hall. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and ap
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