52 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
specimens from zone Dr. 7 I, 1 e. Nos. 1 to 26 belonging to the 
Cornell University Museum, and for the pedicle valves Nos. 27 to 41 
of the same station. } 
The specific name Orthis (Dalmanella) superstes was given by 
Hall and Clarke to these thickened forms with vascular markings.‘ 
The “ broad, low, median sinus” on the pedicle valve running from 
the middle of the valve to the front, described as a distinctive charac- 
ter of O. superstes,® is not seen on specimens of D. danbyt. - 
Although the specimens of ). danbyi generally occur in the con- 
dition of molds, a few have been collected with the shell of the sur- 
face ‘preserved. 
In size the specimens of ). danbyi rarely exceed 12 mm. in width. 
The following specimens are selected and figured as types of 
Dalmanella danbyt on Plate II. 
Fig. 15 (Ith. 3 K. 1 kk, specimen 1), mold of interior of brachial 
zalve. (Compare with 1225 B 1. 21.) 
Fig. 14 (Ith. 3 K. 1 00., specimen 1), mold of interior of brachial 
valve. (Compare with 1225 B. 1. 21.) 
Fig. 25 (Dr. 7 I, 1 e., specimen 31), mold of interior pedicle valve. 
Fig. 7 (Dr. 7 I, 1 e., specimen 46), mold of exterior pedicle valve. 
ig. 38 (Ith. 38 K. 1 00., specimen 2), mold of exterior brachial 
Fig. 8 (Ith. 38 K. 1 00., specimen 3), mold of exterior pedicle 
valve. 
Fig. 4 (Ith. 3 K. 1 rr.), mold of exterior of brachial valve. 
Locality Ith. 3 K. is in West Danby, Tompkins County, and is the 
typical section of the Dalmanella danbyi zone at the base of the 
Chemung formation. 
Dr. 7 I, is a section on the east side of Bald Hill, Caroline, Tomp- 
kins County, and also contains the fauna of the Dalmanella danbyi 
Zone. 
DALMANELLA ALLEGANIA, new species. 
Plate II, figs. 17 and 20. 
This name is proposed for specimens having the form beta and 
figured by Hall’ among the types of his species Orthis leonensis. 
The specific character, namely, its broadly oval shape, distinguishes 
it from the typical Dalmanella leonensis of Chautauqua County. 
The typical specimens measure 8 by 11 mm. and 8.7 by 12.83 mm. The 
surface markings and the interior markings of both valves are very 
similar to those of 2. leonensis. The muscular scars of the pedicle 
valve are wider than in PD. /eonens?s. No specimens of this form have 
been seen by the writer among the specimens of 2). deonensis of Chau- 
tauqua County. 
CERI ING Mo, WHUOE Ii dl, Tee, jo, SR 
> See p. 53. ; 
EEG INS Wop IY 5 TH LUO, io \aanE, Se 
