DEVELOPMENT OF THE BRACHIOPODA 



245 



Including the genera : 



Ampliigenia. 

 Aulosteges. 

 Bactrynium. 

 BiloUtes. 



Camarella (group). 

 Camarophoria. 

 *Chonetes. 

 Clitambonites. 

 Conchidium. 

 Davidsonella. 

 Davidsonia. 

 Daviesiella. 

 Derbya. 

 Enteletes. 

 Eudesella. 

 Hemipronties. 



Hipparionyx* 

 *Lacazella. 

 *Leptcena. 



Leptcenisca. 



Lyttonia. 



Meekella. 



Mimulus. 



Oldhamina. 

 *0rthis (group). 



Orthisina. 

 *0rthothetes. 



Pentamerella. 



Platystrophia. 

 *Plectambonites. 



Porambonites? 



Proboscidetta. 





*Productella. 

 Productus. 



* Rhipidomella. 

 Schizopkoria. 

 Sieberella. 

 Streptis. 



*8treptorhynchus. 

 Stricklandinia. 

 Strophalosia. 



* Stroplwodonta. 



* Strophomena. 



* Strophonella. 

 ThecideUa. 



* Thecidium. 

 Thecidopsis. 

 Triplecia. 



TELOTREMATA. 



(reXo? last, and rp^^a perforation.) 



(Plate XI, figures 22-28.) 



Protegulum as in Atremata. Pedicle-opening shared by 

 both valves in nepionic stages, usually confined to one valve 

 in later stages, and becoming more or less limited by two 

 deltidial plates in ephebic stages. Arms supported by cal- 

 careous crura, spirals, or loops. Valves articulate. 



Including the genera : 



Acanthotliyris . 



Ambocoe.Ua. 



Amphidina. 

 *Athyris. 



*Atretia (Cryptopora). 

 *Atrypa. 



Bifida. 



Bouchardia. 



Centronella. 

 *Cistella. 



Clorinda. 

 * Ccelospira. 



Ccenothyris. 



Cryptonella. 



Cyrtia. 



Cyrtina. 



Dayia. 



Dictyothyris. 



Dielasma. 



Dimerella. 



Disculina. 



Eatonia. 



Eudesia. 



Eumetria. 



Glassia. 



Grunewaldtia. 

 *Hemithyris. 



Hindella. 



Ismenia. 



Karpinskya. 



Kayseria. 



Kingena. 



Koninckella. 

 * Koninckina. 

 *Jraussina. 

 *Laqueus. 



