surmount the difficulty by substituting the name Conocephalites 

 for Conoceflialus^. In 1872 the late Mr. F. B. Meek, whose 

 great care and perspicuity it is a pity more of us do not follow, 

 adopted! Corda's names to the exclusion of Barrande's 

 substituted one. Finally in the words of Mr. Walcott : — " This 

 division [^■.e., of Conocephalus, Zenker] appears to me to be one 

 demanded by the characters of the two types, and I fully endorse 

 the opinion of the late Mr. F. B. Meek (....) that Mr. 

 Corda's names should be adopted, and the subsequent name 

 Conocephalites, proposed by Mr. Barrande, in 1852, treated as a 

 synonym. I" In these terms I now employ the name Ptychoparia 

 for Conocephalites australis, Woodw., and the fragmentary 

 cephalic shield, lately obtained by Mr. Howchin, for which I 

 propose the name of — 



Ptychoparia Howehini, sp. nov. Pi. IV., figs. 1-3. 



Sp. Char. — Glabella oblong, with sides almost parallel, narrow- 

 ing but very slightly towards the front, which is evenly rounded; 

 surface convex, and slightly arched in the middle line, most so 

 posteriorly ; furrows in three pairs, the first or posterior pair 

 being the strongest marked, consisting of shallow depressions 

 extending inwards nearly to the arched median line ; second or 

 middle pair still shallower and shorter, issuing from the axial 

 grooves halfway between the first pair of furrows and proximal 

 ends of the ocular ridges ; third or anterior pair very short and 

 faint, mere nicks in the lateral margins of the glabella, exactly 

 opposite the proximal ends of the ocular ridges ; basal lobes the 

 most pronounced, the anterior lobe the largest, gradually sloping 

 downwards to the well developed frontal furrow, which is wide 

 and gently concave ; fillet (bourrelet) of the limb prominent, 

 thick, and rounded. Facial sutures anterior to the ocular ridges, 

 straight (i.e., parallel to the longer axis of the glabella), giving to 

 the anterior portions of the united glabella and fixed cheeks a 

 square appearance. Fixed cheeks gently convex, but not wholly 

 preserved. Ocular ridges very well marked, broad and rather 

 flat, very oblique to the longer axis of the glabella, bounded pos- 

 teriorly by faint furrows. Axial furrows broad and not deep. 

 Ornament consisting of granules of two orders, small, and minute 

 respectively, interspersed with one another, and distributed over 

 the whole surface, including the frontal furrow, limb, and ocular 

 ridges. 



* Syst. Sil. Boheme, 1852, I. p. 415. 



t 6th Ann. Report U.S. Geol. Survey Territories (Hayden's), 1872, 

 T) 487 I regret that I have not this work at hand to refer to. 

 X Bull. U.S. Geol. Survey (Powell's), No. 10, 1884, p. .35. 



