WAVERLY GROUP SPECIES. 321 



type, it shows no traces of ocular spots, while it has the posterior end 

 merely subtruncated very obliquely backward from below, but not in the 

 slightest degree sinuous. At a first glance it looks like the valves of a 

 narrow, elongated bivalve moUusk, but its sculpturing is decidedly of 

 crustacean type, being like that of some species of Ceratiocaris proper. 

 It shows no indications of having its valves anchylosed along the dorsal 

 margin. 



Ceratiocaris (Solenocaris) strigata, Meek. 



Plate 18, figs. 4a, 6, c.) 



Ceratiocaris (Soknocaris) strigata, Meek, (1872) ; Proceed. Acad. Nat. Sci., Philad., 

 XXIV., 335. 



Carapace valves narrow and elongated, the length being about four 

 times the height, rather distinctly convex ; dorsal and ventral margins 

 nearly straight and parallel ; anterior very narrowly rounded, the most 

 prominent part being at the middle; posterior end so obliquely trun-' 

 cated as to impart a pointed appearance to the posterior dorsal extremity, 

 which is not curved. Surface showing well-defined, comparatively rather 

 coarse, more or less anastomosing longitudinal striae, that seem not to 

 curve exactly parallel to the anterior and lateral margins, and are usu- 

 ally more or less impressed upon internal casts. 



Length, 1.24 inches; height, about 0.30 inch ; convexity, about 0.23 inch. 



Locality and position ; Same as last. Prof. Bradley's collection. 



TETRADECOPODA. 



? Genus ARCH^OCARIS, Meek, 1872. 

 (Proceed. Acad. Nat. Sci., Philad., XXIV., 335.) 



Arch^ocaris vermiformis, Meek. 



Plate 18, fig. 7. 

 Archxocaris vermiformis, Meek (1872) ; Proceed. Acad. Nat. Sci., Philad., XXIV., 335. 



The specimens of this fossil yet known are too imperfect to be sys- 

 tematically characterized, but it may be described, in a general way, as 

 follows, the description being intended to apply to a side view of an 

 individual, as seen more or less compressed laterally in concretions : 



Cephalothorax, or head, about equaling the length of the first three and 

 a half of the body segments behind it; subtrigonal in form, being some- 

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