99 
point directed forward as in those of Paradoxides. The circumscribed lobes, 
both anterior and posterior, so characteristic of this genus, are in this example 
very well marked, and seem to be sub-triangular. All the cranidia are 
superficially strongly granulate, and this constitutes another distinctive 
character separating this genus from other allies. 
J. W. Gregory has figured ( loc. cit., pi. XXVI., fig. 8) a cranidium of 
Dinesus with two thoracic segments ; these latter show a broad axis with 
narrow pleurae, which features are not very characteristic of the Bathyuridce. 
Very closely akin to the figure of the Dinesus cranidium with thoracic segments 
given by Gregory is that of Ptychoparia orestes, Hartt sp., 1 from the St. John 
formation of New Brunswick, which Dr. Walcott has figured as Hartt’s type 
• of Conocephalites Jialli , now merged into the fore-named species. In this 
there are a similar ovate and deeply margined glabella and narrow pleurae. 
A pygidium is here figured which may possibly belong to Dinesus. It is 
too short for Ptychoparia, which in some points it otherwise resembles, and the 
axis and lateral divisions are in keeping with the character of the Dinesus 
thorax. 
Genus Saratogia, Walcott. 
Saratogia cf. hamtjlus, Owen sp. Plate VII., fig. 23. 
Observations .—The genal spine here figured bears a very close resemblance 
to the “ fish hook spine ” figured by Owen 2 under the name of Lonchocephalus 
hamulus ; the only difference being in the less pronounced curve of the spine 
at the genal angle in the present form. S. hamulus is an Upper Cambrian 
species from the Franconia formation of Wisconsin, U.S.A. 
? Saratogia rugulata, sp. nov. Plate VII., fig. 24. 
Description. —-The specimen here referred tentatively to the genus 
Saratogia is a free cheek resembling that of a ptychoparian, having a strongly 
■wrinkled or furrowed surface and thickened border. The eye lobe is 
represented by a median crescentic margin. It probably belongs to a stout, 
heavy type of trilobite, judging from the thick rugose character of the 
specimen. The facial suture, with its deeply crescentic eye lobe, resembles 
that of Saratogia calcifera, Walcott sp. 3 . In depth from back to front of this 
free cheek is 7 mm., and its total width, 10 mm. 
The genus Saratogia is described by Dr. C. D. Walcott as having cranidia 
and free cheeks not unlike those of Crepicephalus iowensis, Owen, and 
Ptychoparia diademata, except that the fixed cheeks are narrow in Saratogia. 
This genus is typically Upper Cambrian, but its range extends downwards 
into the Middle Cambrian. 
Fam. Dikellocephalid^;. 
Genus Saukia, Walcott. 
Cf. Saukia sp. Plate VII., figs. 25-26. 
Observations.-— The cranidium provisionally referred to this genus has 
glabella slightly expanding in front, the frontal lobe of which is tumid. 
The glabella is divided by two deep lateral furrows extending across the 
glabella, and there is a narrow occipital ring present which is somewhat 
crushed. The fixed cheeks are divided from the glabella by deep narrow 
furrows, and are apparently long elliptical, cut off transversely at the base, 
1 Walcott. Bull. U.S. Geol. Surv., No. 10, 1884, p. 39, pi. V., fig. 3. 
2 Hep. Geol. Surv., Wisconsin, Iowa and Minnesota, Philadelphia, 1852, pi. IA., fig. 8. See also 
Walcott, Smithsonian Misc. Colls., vol. LXIV., No. 3, 1916, p. 195. 
* Conocephalites calciferous, Walcott. Thirty-second Ann. Rep., New York State Mus., 1879, pp. 
129-130. Saratogia calcifera, Walcott sp. Smithsonian Misc. Colls., vol, BXIV., No, 3, 1916, p, 197, 
pi. XXXIV., figs. 6, 6 a-e. 
