CLASSIFICATION. 
Jh acli. 3 
• Subord. Thecacea, n. (p. 152). 
^Fam. Billing sellidce, n. (p. 152). 
Fara. Strophomeniclce. 
Subfam. Orthothetince. 
Subfam. Rufinesquince , n. (p. 153). 
Subfam. Cadomellince. 
Fam. Tkecidiidte. 
Subfam. Thecidiince. 
Subfam. Lytioniinaz. 
Fam. ProductidcG. 
Fam. Richthofenidm. 
Fam. Ortlxidm. 
Order Telotremata. 
- Subord. Rostracea, n. (p. 155). 
Fam. Rhynchonellidaz. 
Fam. ? Eichwaldiida ?, n. (p. 155). 
Subord. Helicoregmata. 
Fam. Atrypidaz. 
Subfam. Zygospirince. 
Subfam. Atrypince. 
Fam. Spiriferidcs. 
Subfam. Suessiince. 
Subfam. Uncitince. 
Subfam. Trigonotretince , n. (p. 156). 
Fam. Nucleospiridce. 
Fam. Athyridaz. 
Subfam. Athyrince. 
Subfam. Meristellince. 
Fam. Konincldnidaz. 
Subord. Ancylomiaciiia. 
Fam. Terebratulidaz . 
Subfam. Centronellince. 
Subfam. Stringocephalince. 
Subfam. Terebratulince. 
Fam. ? Dyscoliidce. 
Fam. Terebratellidaz. 
Subfam. Dallininaz , n. (Beecher, p. 159). 
Subfam. Platidiinas. 
Subfam. Mcgathyrinaz. 
Subfam. Magellaninoz , n. (Beecher, p. 160). 
Subfam. Magasince. 
Subfam. Kraussinince. 
His paper is accompanied by a table showing the relationships and 
geological distribution of these families. 
