88 



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

 more than appear to have been represented during the Cambrian epoch; 

 while 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. 



ADDEI^[DA. 



(December, 1877.) 

 AcrotlaeSe, Linnarson. Discinidw. 18711. 



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

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

 Kutorga. Mucb like typical Discina. 



JEgilopn^ Hall. f BracJiiopoda. 1§«5©. 



Tbird Eegent's Rep. App. K. p. 171 ; sole ex. ^. suhcarinata, Hall, 1. c. 

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

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

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



I^y§img®tlayri§, Hall. • Spiriferidce. 186S. 



Twentietb Eeg. Eep. p. 388, note; lapsus ^^ Syringothyris, Wincbell. 



©rtla®id£a5 Friren (1). Incert. sedis. 187«5. 



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

 Hasina, Fr. n. s. Q uoted as a Brack, in Geol. Kec. for 1875, index of n. s. 

 p. 351. 



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

 ever, aftect tbe synonymy in Bracbiopods. 



ilE^plBylltaBMj Lindstrom. Coelenteratm. 



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



Igwessia, Deslongchamps. Splri/eridw. 1854. 



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

 Prov. 1855 ^not 1S54) ; extras, p. 6, f. 8-11, 12-16. 1st sp. S. imiricata, 

 Suess, 1. c. 



TrcBmatis, Sharpe. Biscinidce. 1847. 



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

 cula terminalis, etc. 



