110 PLANARIA. 
Note.—The genus Planaria has received much embellishment from 
the pursuits of two naturalists, M. Duges of Montpellier, who has en- 
deavoured to divide it into sections, founded chiefly on the position of the 
principal organs—and Mr Darwin. 
The latter has discovered no less than twelve terrestrial species, ten 
of which he describes. Mr Darwin also describes five new marine species. 
Most of those animals belong to South America, and to some other dis- 
tant regions visited by Mr Darwin.—Annals and Magazine of Natural 
History, v. xiv. p. 241. 
¢.—PLANARIA FopINE—The Quarry Planaria.—Plate XV. Figs. 7, 
So alO: 
Length a quarter of an inch or more ; body full, plump, diminishing 
towards the anterior extremity, and obtuse behind.—Plate XV. fig. 7 ; the 
same, enlarged, fig. 8. Two yellow eyes are very conspicuous near the 
anterior extremity, fig. 9. The mouth, apparently below, also near the 
anterior extremity. This Planaria feeds greedily on mussel. Colour 
pale, dingy yellow. Motion swift. 
On crawling up the side of a glass jar, they readily drop from their 
position ona slight shock, being apparently timid. Their natural dwel- 
ling is among mud. 
This animal propagates in August and September, producing sphe- 
rical yellow ova. 
Specimens were taken in July from an old quarry at Fenton Tower, 
in the county of Haddington. On August 14. two of them appeared on 
the side of a jar, each with a large ovum, considerably higher than the 
middle of the body. A month later, an ovum was also seen occupying 
the body of several, seemingly full-grown individuals, though appearing 
in some, which are in an earlier stage. The ovum is best seen from be- 
low, as the belly is paler, and the parts thinner, fig. 10, slightly enlarged ; 
fig. 11, more enlarged. I have not observed more than one ovum at a 
‘time in a specimen. Probably it is generated from the posterior extre- 
mity, and ascends upwards. 
