C. H. F. Peters—Positions of Swift's Comet. 215 
pedicellarie. In life these clusters of pedicellarize are supported 
on soft extensible processes, which project beyond the ends of 
the spines of the lower surface, giving it a very peculiar appear- 
ance. Some of the specimens were two feet in diameter, Th 
color was usually bright red above, yellowish below; some 
specimens varied to orange-red, and others to purplish or 
e 
brownish red, above. 
Ophiacantha anomala G. O. Sars, Vidensk.-Selsk. Forhandl., 1871. 
A handsome species, having six arms, and of a bright salmon- 
color when living. single specimen was dredged by us in 
the Gulf of Maine, 140 miles east of Cape Ann, in 112 fathoms, 
sand and gravel, in 1877. 
With this was associated another beautiful salmon-colored 
species (?Amphiura Otteri Ljung.) with five long slender arms. 
Ophioscolex glacialis also occurred at the same locality. Both 
the latter had, however, been taken by our parties in previous 
years, 
Art. XXI.— Positions of the Comet discovered by Mr. Lewis Swift ; 
by C. H. F. Perers. (From a letter to the Editors, dated 
Litchfield Observatory of Hamilton College, Clinton, N. Y., 
July 6, 1878.) 
Or the comet found by Mr. Lewis Swift of Rochester on 
July 6, the following positions were here obtained : 
1878. Ham. Coll. m.t. a Comet. 5 Comet. 
h 
July 10, 13 5 58 1717 1024 + 939322 10 “ 
July 19, 10 27 58 16 30 35°35 —12 42225 4 “ 
uly 28, 94212 1612 4158 ~—21 18169 8 “ 
The approximate parabolic elements herefrom derived are: 
(Epoch) Time of Perihelion passage, July 20°753 Berlin m. t. 
m = 279°52'-06 
= 102 15°72 | M, Eq. 1878-0, 
i= 78 11°41 
_Much labor would be saved to astronomers, if comet-hunters 
like Mr. Swift, would indicate the position of a new discovery 
With a little more accuracy. For obtaining it with only a few 
minutes’ error, nothing else is needed but a common watch 
jm connection with the field of the telescope used as a ring- 
micrometer. 
Am. Jour. gecetidane: pee, Vou. XVI, No. 93.—SzPr., 1878, 
