82 AwALS OF 'JHE Carnegik Musfxm. 



list there are fifteen genera, eleven of which are not represented by 

 the work previously done. These genera belong to the families Cen- 

 tronellidas {Tn'i^ena), 'i'erebratiilidK {Ennella), Teretratellidse {Tro- 

 pidoleptiis), SpiriferidiC {Cyr/ina, Delthyris), Cranidae {F/w/idops, 

 Craniella), Strophomenidae {Stropheodonta, Pholidostrophia), and 

 Productidaj {Choiiefes, Strophalosia^. The genera Crania, Rhipido- 

 mclla, Spirifer zwdi OrtJwthetes are here represented by middle Devo- 

 nian species, while the previous work was done on Silurian species, and 

 interesting points may be obtained by comparison. 



The following list shows which of the brachiopods that occur in 

 this material furnished series suitable for study. 



Camarotccchia cong/ri^ahi (Conrad). Two specimens, both adults. 



C. Jiorsfordi Hall. One specimen, an adult. 



C. sapplio Hall. One specimen, an adult. 



Trigeria lepida Hall. Specimens few, but most of the growth stages 

 are represented. 



Eunella //niklcciii Hall. Complete series. 



Tropidolcptiis carina fi/s (Conrad). Abundant both in young and 

 mature stages. 



Atrypa reticularis (T>innaeus). One specimen. 



Cyrtina Jiamiltoiiensis Hall. Full series. 



Spirifer iiii/crotia/as Conrad. Full series. 



S. audaciiltis (Conrad). Some young specimens but not a full series. 



S. graiiiilosi/s (Conrad). Few specimens, all adults. 



Dellliyris consobrinus (d'Orbigny). Full series. 



D. sciilptilis Hall. Rare, all adults. 

 Reticularia fiiiibriata (Conrad). Rare, adults only. 

 Ainboca'iia u/iii>o/iata (Conrad). A few very small specimens; 



adults not present. 



Niicleospira concinua Hall. Rare, adults only. 



Atiiyris spiriferoides (Eaton). Rare, adults only. 



Piwlidflps oblata Hall. Common, full series. 



P. haniiltonice Hall. Abundant. Full series. 



Crania crenistriata Hall. Rare. Incomplete series. 



Craniclla iianiilio/iice Hall. Fairly complete series. 



Stroplicodonta concava Hall. Rare. T>ater neanic and adult stages 

 only represented. 



S. deniissa (Conrad). Adults only, rare. 



S. inceqtiistriata (Conrad). Common. Full series. 



