88 



It is seen that of sixteen families, six have living representatives, one 

 more than appear to Lave been represented during the Cambrian ei^och; 

 w hile but two of the Cambrian families have survived. All those living 

 in Cretaceous times have endured till now. All now living had Pale- 

 ozoic representatives, while half the Paleozoic families do not appear to 

 have survived the changes which introduced the Mesozoic time. 



A D D E ^^ D A . 



(December, 1877.) 



Aca'otlneBe, Linnarson. Discinidcv. 1876. 



Bibang till K. Svensk. Vet. Ak. Handl. iii, No. 12, p. 20. 1st sp. A. 

 coriacea, Liuuars. 1. c. p. 21, pi. iv, f. 44-4d. (Cambrian.) Comp. Mesotreta, 

 Kutorga. Mucb like typical Discina. 



^gilops, Hall. f BracMopoda. I§«d0. 



Third Regent's Rep. App. K. p. 171 ; sole ex. ^. snbcarinafa, Hall, 1. c. 

 pi. 4, f. 1 a-h. (Trenton.') A squeezed indeterminate cast, described 

 (iufei-entially) as a Lamellibrancb, but referred to Bracbiopoda by Mil- 

 ler, Am. Pal. Fos. p. 103, 1877 ; no diagnosis ; incert. sedis. 



lij'siiBgotlayB'ig, Hall. Spb ij^cridce. 1§6S. 



Twentietb Reg. Rep. p. 388, note; lapsus ^^ Sjjringothyris, Winchell. 



i^B'iSaofldea, Friren (?). Incert sedis. 187«5. 



Bull. Soc. Nat. Hist, de Metz, 1875, p. 22, pi. i, ii. (Middle Lias.) O. 

 Hasina, Fr. n. s. Quoted as a Bracb. in Geol. Rec. for 1875, index of n. s. 

 p. 351. 



This term, as used by lUiger, was spelled Prionites. This does not, how- 

 ever, aftect tbe synonymy in Bracbiopods. 



KSiizoiJliyMaaDM, Lindstrom. Coelenteratcc. 



Dr. Lindstrom is convinced that tbis is distinct from Calceola. 



SiaessBa, Beslongchamps. Splriferidcc. 1854. 



First published by Dav. 1. c. (See p. 69.) Afterward in Ann. Inst. 

 Prov. 1855 (not 1S54) ; extras, p. 6, f. 8-11, 12-lG. 1st sp. <S. imhricafa, 

 Suess, 1. c. 



Tresiiatis, Sharpe. Discinidcc. 1847. 



Page 73, instead of " Type " read " Ist sp. 1. c. p. 68, f. 1-3," OrU- 

 cula terminalis, etc. 



