110 RESEARCH IN CHINA. 



Associated pygidia transversely semicircular, axis conical, with two or more 

 rings, marginal border spinose, with the anterior pair of spines, in the type species, 

 very strong. 



It may be that some of the pygidia described under Olenoidcs and Damesclla 

 belong to this genus, but with our present knowledge it would be difficult to identify 

 them. 



The genus is characterized by the peculiar glabella, narrow frontal margin, 

 and spinose pygidium. It is assumed that the pygidia associated with the cephala 

 belong to the genus, as there is no other associated form to which they could be 

 referred except Damesella blackwelderi [p. 125], and from this the pygidium differs 

 in its short, conical axis, and the character of the spinose border. 



The pygidia referred to Teinistion by Doctor Monke are unlike those found 

 associated with the cephala of Teinistion typicalis Walcott. They are much more 

 closely related to the pygidia referred to Stephanocare sinensis Bergeron. It may 

 be that the generic reference of the pygidium in each case is incorrect, as the cephala 

 are associated with various forms of pygidia and no entire specimen of either species 

 has been found. 



Genotype. Teinistion lansi Monke. 



The species referred to the genus are T. lansi Monke, T. sodeni Monke, T. alcon 

 (Walcott), and T. typicalis (Walcott). 



Teinistion alcon (Walcott). 

 Plate 9, Figure 3. 



Dorypygella alcon WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 33. (Described and discussed 

 as a new species essentially as below.) 



This species is represented by a single, somewhat imperfect specimen of the 

 central portions of the cephalon. Glabella broadly truncato-conical, its width at 

 the base and its length being the same; a pair of short, shallow posterior furrows 

 occurs, which outlines a postero-lateral lobe that extends out into and crosses the 

 dorsal furrows ; a second pair of furrows is very slightly indicated a short distance 

 in advance of the posterior pair; back of the postero-lateral lobe there is a deep, 

 sharp, narrow furrow on the slope into the occipital furrow; occipital furrow slightly 

 defined, shallow near the center, and deeper laterally; occipital ring unknown; dor- 

 sal 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 slightly greater than that of the glabella, and slope gently 

 backward to the posterior furrow, and rather abruptly downward in front of the 

 palpebral ridges; palpebral ridges broad and rounded; they originate opposite the 

 glabella, somewhat interrupt the dorsal furrow, and extend outward subparallel to 

 the frontal margin of the cephalon to the palpebral lobes; 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 cephalon 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 atid the fixed cheeks. 



One of the peculiarities of this cephalon is the blending of the palpebral 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 peculiarity is the interruption of the dorsal 

 furrow by the palpebral ridges and the postero-lateral lobes of the glabella. 



The inner surface of the crust is minutely punctate, as shown by the minute 

 papillae on the cast; this may indicate that the outer surface was finely granulose. 



