oma) 
338 ANALYTICAL INDEX. 
CHAPTER ITI.—continued. 
§ 2. All the preceding Planariz inhabit the sea, ‘ PAGE 
Others dwell in lakes, ponds, and marshes, 
a.— PLANARIA HEBES—The Sluggish Planaria, 
Length, breadth, colour, &e. described, 
Plate XVI. explained, 
b,—Puanaria racteEA—The Milky Planaria, 
Type of the genus Planaria usually selected by Naturaliets, 
Found in Philipston Loch, and in a a at Red Braes, 
Animal described, 
When replete with food the Nees is divplaved, 
Propagation—Dr Johnson, 
Feed alike on animal and vegetable matee 
Lives in society, among decaying ae 
Of nocturnal habits, 
Plates XIV. and XV. explained, 
Note.—The genus Planaria—M. Duges and Mr Darwin 
c.—PLANARIA FopINa—The Quarry Planaria, 
Size, appearance, and organs described, 
Propagation, 
History of specimens, 
Lurks among mud—animal rare, 
Plate XV. explained, 
d.—PLANaRiaA ARETHUSA—The Fountain Planaria, 
Slight and indefinite distinctions perplexing, 
This species not to be identified with the Planaria torva, 
Description of specimens collected at the Dropping Well, Foul- 
den, Berwickshire, 5 
Feed on animal substances, the snow-white pupa thers farms 
Colour, size, and aspect depend upon quantity and quality of 
the food, 9 : 
Protected from abrasion by a einen secretion, 
Propagation obscure—M. Duges, 
Vigorous reproductive faculty—Dr Johnson, 
Dwell in springs or fresh-water rills, 
Plate XVI. explained, 
f—PLANARIA VARIEGATA, c 
Observations on a single specimen, 
Length, breadth, &c., 
107 
ib. 
ib. 
ib. 
ib. 
111 
112 
ib. 
113 
114 
115 
