B. K. Greger — JSf. American Species of Ethericlgina. 537 



deflection of theanterior margins of thepedicle valve and a thickening 

 or piling up of the shell layers along the margins of the brachial 

 valve. With the upward deflection of the anterior and lateral 

 margins of the pedicle valve, a number of irregidar, hollow, spine- 

 like digitations form around the margins of the pedicle valve and 

 continue to grow outward, closely adhering to the surface of the 

 host. When the size of the host is small, as in the case of a small 

 crinoid column, the digitations in following the surface appear to 

 clasp the host, but I can scarcely attach any morphologic significance 

 to the fact. 



Etheeidgina incondita u.sp. (PI. XIV, P'igs. 16-18.) 



Shell minute, seldom attaining a diameter greater than 2"5 mm., 

 breadth somewhat greater than length ; very irregular in outline. 

 Pedicle valve cemented to foreign objects and conforming to their 

 surface ; area of attachment confined to the visceral region ; beak 

 free and slightly raised. Anterior and lateral margins of the valve 

 deflected upwards at maturity and forming a trail. Brachial 

 valve flat or somewhat convex, except along the anterior margins ; 

 here a rim is formed where the edges conform to the upturned margin 

 of the pedicle valve. Hinge-line as long as or slightly shorter than 

 the greatest breadth of the shell ; a linear cardinal area, delthyrium, 

 and well-developed teeth are present. Spines variable in number 

 and confined to the margins of the pedicle valve. 



This interesting little species is found in the Elmdale Formation 

 (Pennsylvanian), in the vicinity of Beaumont and Cambridge, 

 Kansas, attached to the larger brachiopods of the fauna. It occurs 

 less abundantly in the Kansas City Formation (Pennsylvanian), 

 in Jackson and Grundy Counties, Missouri. 



Holotype : the original of Fig. 16, from Beaumont, Kansas 

 (author's collection). 



Etheeidgina? spoNDYLiFORMisWhite&St. John. (PI. XIV, Fig. 15.) 



1868. Aulosteges spondyliformis White & St. John, Trarin. Cliicago Acad., 



vol. i, i3t. i, p. 118, text-fig. 2. 

 1915. Strophcdosia .spondyliformis ? Girty, Bulletin 5-4-1, U.S. Geol. Surv., 



p. 80, pi. X, fig. 8. " 



I know this interesting little species only from the description and 

 figure given by the authors, and its relationship to the species here 

 discussed is inferred wholly from a study of the description. 

 Dr. Girty has figured and referred to this species a very obscure 

 specimen from the Wewoka Formation (Pennsylvanian) of Oklahoma. 



Hall &, Clarke figure a Stro-phalosia sjJondyUformis ; vol. viii, pt. i, 

 pi. xviia, figs. 25-6. This is a tiueStrophalosia; it is a rare species 

 in the Kansas City formation. All specimens of the species in my 

 collection show a misshapen and twisted pedicle beak, and, in^ 

 variably, a cicatrix of attachn:yent. 



