472 RB. P. Whitfield—Lingula in the Trenton Limestones. 
TABLE II.—Concluded. 
; Au 
Double A. | B. |B-A. thor- 
Star. Name. mag. |mag.|mag Color A. Color B. ity 
25| 21967 |y Coronz | 4°0| 7°0| 3°0 |Albasubvir. Purpurea 2 
26} 22032 |o Coronze | 5°0} 6°1| 1°] |Subflava Subczerulea x 
27| £2055 | Ophiuchi | 4°0| 6°1 | 271 |Flava Subceerulea z 
28) 22084 !¢ Herculi ‘0| 6°5 | 3°5 |Subflava Subrubra z 
29| 22107 |Hercul. 167| 6-5 | 8-0| 1°5 |Subflava Subceerulea p 
30| 2272 |70Ophiuchi| 4°1/| 6-1 | 2-0 |Flava Purpurea z 
31} 22289 |Hercul. 417) 6°0| 7:1} 1:1 |Flava Subceerulea z 
32| 22382 |e’ Lyre 4:6} 6°3| 1-7 | Albasubvir. | Albasabezerulea z 
33| 2579 |6 Cygni 3:0| 7-9 4:9 |Subviridis Cinerea x 
34| 2603 je Draconis | 4-0| 7°6| 3°6|Flava Cverulea z 
35) 02413 |A Cygni 5°5| 7°6| 21 |Blanche Cendri Clair De 
36) A. G. Clark. |r Cygni 4:9} 74) 2°5 |Light yellow Light blue De 
q| 22822 |u Cygni 0} 5:0} 1:0 |Alba | Albasubceerulea z 
38| 22934 8°2| 9°2| 1°0|Albasubflava Alba z 
39| 02483 [52 Pegasi | 6:°0| 8-0| 2:0 |Blanche Cendri De 
40} 02489 |r Cephei | 4-4! 7°5| 3-1 |Jaune Clair Olivatre De 
41| %3001 jo Cephei 5°2| 7-8| 2°6 |Kq. flava q. ceerulea »» 
421 OX507 'B.A.C. 8277! 6°31 7°7! 1:4 ‘Blanche Cendri Olivatre De 
Binaries different colors: = (B-A) = 97-4; mean (B-A) = 2-44. (Nos. 16 
and 18 omitted). 
Art. LXIV.—On the occurrence of true Lingula in the Trenton 
Limestones ; by R. P. WHITFIELD. 
Ir has been supposed by many that the Brachiopodous 
genus, Lingula, as represented by Lingula anatina Lamarck, & 
living species, was not represented among the fossil Lingulid 
of the older Paleozoic rock formations, if anywhere in rocks 
of Paleozoic age; and there has been a growing tendency to 
class all the Linguloid shells of these formations under other 
generic names. There is no question but that many of the 
forms represented in the Paleozoic rocks are really generically 
distinct from the living types; but I think we have proof in 4 
species from the Trenton limestones of Wisconsin and Minne- 
sota, that the true Lingulz were represented by at least one gi 
cies at that period. Several years ago I received from 
Aaron Elder, formerly of New York city, who had been spend- 
ing a summer near Rochester, Minn., some internal casts of an 
undescribed Lingula. On examining them and finding the 
markings of the muscular scars and vascular lines very strong, 
I urged Dr. Elder to obtain more of the casts, at his next visit 
to that place, calling his attention particularly to these mark- 
ings. During the following autumn I received other specimens, 
from some of which the accompanying figures and description 
of parts are taken. The species I propose to name Lan 
. 
. 
