428 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 53 



PAGE 



DoUchomctopus acadicus Matthew 360 



Fig. I. (X2.) Cranidium. 



la. (X2.) Outline of cranidium. 



lb. (X2.) Free cheek. 



ic. (X2.) Associated pygidium. 



The above figures are reproduced from Matthew (Trans. Roy. Soc. 

 Canada, 2d ser., Vol. 3, Sec. 4. 1897, pi. 3, figs. 6, 6a-d). The type 

 specimens are in the collection of Dr. George F. Matthew, St. John, 

 New Brunswick, Canada. 



Locality, Hastings Cove, New Brunswick, Canada. 



DoUchomctopus productus (Hall and Whitfield) 369 



Fig. 2. (Natural size.) Figure of a dorsal shield drawn from several 

 specimens. The portion below the diagonal line is one piece. 

 U. S. National Museum, Catalogue No. 15459- 



This figure was published by me in 1886 (Bull. U. S. Geol. Surv., 

 No. 30, pi. 30, fig. lO- 



2(7. (Natural size.) Crushed and distorted cranidium. U. S. Na- 

 tional Museum, Catalogue No. 154560. 



2b. (Natural size.) Crushed and distorted free cheek. U. S. Na- 

 tional Museum, Catalogue No. i545^b. 



2c. (Natural size.) Crushed and distorted pygidium and seven 

 thoracic segments. U. S. National Museum, Catalogue No. 

 15456c. 



2d. (Natural size.) Crushed and distorted pygidium. V. S. Na- 

 tional Museum, Catalogue No. i5456c^. 



2e. (Natural size.) Crushed and distorted pygidium. V. S. Na- 

 tional Museum, Catalogue No. 15456c. 



The specimens represented by figs. 2a-e are the types illustrated by 

 Hall and Whitfield on plate 2, figs. 31, 32, 33. 34, of the species 

 producta and fig. 34 of the species parabola (Geol. Expl. 40th Par., 

 Vol. 4, 1877). 



The specimen represented by fig. 2 is from locality 3c, Middle 

 Cambrian : above Ophir City ; and those by figs. 2a-e are from East 

 Canyon, both in Oquirrh Range, LTtah. 



3. (Natural size.) Pygidium. U. S. National Museum, Cata- 

 logue No. I5455«- 



30. (Natural size.) Cranidium. U. S. National Museum, Cata- 

 logue No. 15455^- 



