20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
L. riciniformis Hall = Genus ? 
Microtrypa altilis Wilson 
Opikina wagneri robusta Wilson 
*Rafinesquina alternata (Conrad) 
R. alternata platys Wilson 
R. normalis Wilson 
R. ottawaensis Wilson 
*Rhynchotrema ainsliei (N. H. Winchell) 
*R. increbescens (Hall) 
R. intermedium Wilson 
Schisotreta canadensis Wilson 
*Sowerbyella punctostriata (Mather) 
*S. sericea (Sowerby) 
*Strophomena delicatula Fenton 
*S. cf. S. dignata Fenton 
*S. filitexta Hall 
S. filitexta crenulata Wilson 
S. filitexta obesa Wilson 
. minuta Wilson 
. mollis Wilson 
. planumbona praecipta Wilson 
. rotunda Wilson 
. thalia Billings 
. venustula Wilson 
Trigrammaria trigonalis prima Wilson 
Zygospira deflecta (Hall) 
Z. recurvirostris (Hall) 
HAHHHHY 
Correlation and discussion of faunal list—This list is composed only of those 
species placed by Wilson in the “Leray column.” Those species placed on the line 
“Leray-Rockland” are added to the Rockland list because many Trenton forms 
appear on the line that elsewhere are unknown in the Chaumont. Even with this 
precaution the list above contains many Trenton forms that are not known in 
the Chaumont elsewhere such as Paucicrura rogata, Sowerbyella punctostriata, 
Rafinesquina alternata and varieties or subspecies, Strophomena filitexta, Rhyn- 
chotrema increbescens. Despite these uncertainties the formation probably is the 
equivalent of the Chaumont of New York. 
Rockland formation.—This is the type region for this formation which here 
consists of about 35 feet of heavy-bedded, gray, somewhat crystalline limestone 
interbedded with shale at some places. The brachiopods are listed below; those 
prefaced by a double asterisk are from Leray-Rockland beds where difficulty 
was experienced in separating the two. A single asterisk indicates a doubtful 
identification as in other lists. 
Camerella hemiplicata (Hall) = Parastrophina hemiplicata (Hall) 
C. panderi (Billings) = Idiospira panderi (Billings) 
**C. volborthi Billings 
**Crama trentonensis Hall 
Dalmanella paquettensis (Sinclair) = Onniella paquettensis Sinclair 
D. rogata (Sardeson) = Paucicrura rogata (Sardeson) 
**Dinobolus canadensis (Billings) = Obolellina canadensis (Billings) 
**D. erectus Wilson=O. erecta (Wilson) 
