CRUSTACEA. 
45 
shales, the lobes of the pygidial fimbria, instead of being flat, broad and 
contiguous, are more lanceolate, relatively narrow, elevated along the middle, 
with the apex nearly terminal. Upon careful comparison of these pygidia 
with Dr. Green’s description of Cnjph(Eus Calliteles, it appears beyond question 
that the species was founded upon a pygidium of this character. The original 
specimens of both C. Calliteles and C. Boothii were derived from the same 
locality, viz.: Huntingdon, Huntingdon county, Pennsylvania. The varietal 
feature of the pygidium with its associated characters is evidently a genetic 
difference, as it is apparent in the youngest individuals observed, and it 
therefore seems advisable to recognize in Green’s species, C. Calliteles, at 
least a variety, with the following differential characters; 
Dalmanites (Cryph^us) Boothi, var. Calliteles.* 
PLATE XVI, FIGS. 5-22; and PLATE XVI A, FIGS. 9-17. 
Cryphmis Collitelus, Green. Ainer. Journ. Science, vol. xxxii, p. 346. 1837. 
Dalmanites Boothii, Hall. Illustrations of Devonian Fossils, pi. xvi, tigs. 7, 8, 12, 14. 1876. 
(1) Cryphwus calliteles, 1 Kayser. Abhandl. z. Geolog. Specialkarte von Pr. und d. Thiir. St., vol. ii, part 
4, p. 32, pi. iii, tig. 10. 1878. 
Genal spines long, flat, tapering to an acute extremity and reaching to the eighth 
thoracic segment; slightly depressed laterally and distinctly grooved by the 
occipital furrow for two-thirds their length. The occipital ring is unusually 
wide, and bears a stout spiniform node at its center. The first thoracic 
segment has a node or faint spine iqion the axial line, and thence backward 
to the pygidium the spiniform nodes increase in size; the first annulation of 
the pygidium also bears a short spine. The lateral lobes of the pygidial 
fimbria are distant, narrow, lanceolate, elevated along the middle, having the 
apex terminal. The axial lobe is shorter than the rest, but more elongate 
than in D. Boothi and acutely angled. The surface of the test is mostly very 
faintly granulose, the glabella and pygidial lobes generally quite smooth, the 
posterior portion of the genal spines more strongly granulose than any other 
part of the surface, and the thoracic segments furnished with single rows of 
low pustules. Abundant material representing this species affords evidence 
* The specific name of this species as originally published is Collitelus, probably a typographical error 
for the personal noun Calliteles. 
