110 PLANAIUA. 



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. 



c. PLANARIA FODIN^E The Quarry Planaria. Plate XV. Figs. 7, 



8, 9, 10. 



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 on a 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. 



