NO. 1415. CA3IBIiIAN FAUNAS OF CHINA—WALCOTT. 33 



DORYPYGELLA ALCON, new species. 



This species is represented by a single, somewhat imperfect speci- 

 men of the central portions of the head. 



Glabella broadl}^ truncato-conical, its width at the base and its leng-th 

 being- the same; a pair of short, shallow, posterior furrows occur, 

 which outline a postero-lateral lobe that extends out into and crosses 

 the dorsal furrow; a second pair of furrows is very slightl}" indicated 

 a short distance in advance of the posterior pair; ))ack of the postero- 

 lateral lobe there is a deep, sharp, narrow furrow on the slope into 

 the occipital furrow; occipital furrow strongly defined, shallow near 

 the center, and deeper laterally; occipital ring unknown; dorsal furrow 

 well defined at the sides in front of the postero- lateral lobe. 



Fixed cheeks about as broad as the glabella; they rise rather 

 rapidly from the dorsal furrow to a height slightl}^ greater than that 

 of the glabella, and slope gently backward to the posterior furrow and 

 rather abruptly downward in front of the ocular ridges; ocular ridges 

 broad and rounded; they originate opposite the glabella, somewhat 

 interrupt the dorsal furrow, and extend outward subparallel to the 

 frontal margin of the head to the palpebral lobe; palpebral lobes 

 broken away, but from the configuration of the broken part of the 

 fixed cheek they appear to have been nearly one-half the length of 

 the head and placed on the most elevated portion of the cheek; frontal 

 rim narrow and nearly flat, transverse, and sloping upward from in 

 front of the glabella and the fixed cheeks. 



One of the peculiarities of this head is the blending of the ocular 

 ridge and the downward slope of the fixed cheek, so that it appears to 

 be a strong ridge just back of the frontal rim; another peculiarit}' is 

 the interruption of the dorsal furrow l)y the ocular ridges and the 

 postero-lateral lobes of the glabella. 



The inner surface of the crust is minutel}^ punctate, as shown by 

 the minute papillae on the cast; this may indicate that the outer 

 surface was finely granulose. 



Length of the head, exclusive of the occipital ring, of the type and 

 only specimen, is 6 mm., with a width near the edge of the palpebral 

 lobes of 10 mm. 



This species is distinguished from D. fyphxdis b}^ its broader 

 glabella and fixed cheeks ^nd upward sloping frontal rim, and from 

 D. alastor by the absence of a frontal limb and the character of the 

 lobes of the glabella. The pygidia, which are referred to D. alastor^ 

 may possibly belong to I). alcon\ but from the fact that thev are 

 evidently from a difl'erent bed of limestone, and that there are no 

 specimens of the head associated with the pygidia, 1 do not think it 

 best to include them under this species, especially as the head of D. 

 alastor and the p3^gidia appear to be from the same bed of limestone. 



Proc. N. M. vol. xxix— 05 3 



