52Q REPORT ON ZOOLOGY, MDCCCXLIV. 



respects of the same nature as the aquatic Planarise, 

 and were distinguished by the same reproductive power. 

 These animals, on creeping, leave behind them a slimy 

 streak, are found under stones and in other moist loca- 

 lities, and most probably live upon vegetable matter [viz. 

 on decayed wood] . Their motion is very sluggish ; they 

 cannot endure water, and shun the light of day. Their 

 intestinal canal appears to be branched in. the same way as 

 it is in Planaria lactea, and their mouth-sucker also retains 

 the power of motion for a very long time after the death or 

 even dissolution of the rest of the body. The external 

 orifice for the mouth-sucker and the genital orifice consist of 

 transverse slits, placed one behind the other, on the abdo- 

 minal surface. Darwin enumerates twelve different species 

 of these terrestrial Planarise, viz. Planaria vagmuloides, with 

 numerous ocelli at the anterior margin of the body, Avith 

 yellow, orange- coloured and black markings, 2^ inch in length, 

 and Planaria elegans, with ocelli only on the lateral edges 

 of the foot, with white, red-brown, and purple markings, one 

 inch long. Both species were found under the bark of 

 decayed trees in the forests of Brazil. Planaria pull a and 

 bilinearis, with numerous ocelli regularly disposed at the 

 anterior part of the body; and Planaria nigro-fusca, with 

 numerous ocelli on the anterior border of the bodv ; those 



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at the anterior edge are grouped in regular series, but 

 on the sides in two and three together. All three spe- 

 cies occur under stones and rotten wood in the districts 

 on the Rio Plata. Planaria pallida, three inches long, 

 the ocelli of which are arranged like those of P. nigro-fusca, 

 was discovered by Darwin in the neighbourhood of Valpa- 

 raiso ; whilst he found in the south of Chili the three 

 species, P. maculata, setnilineata, and elongata, the last of 

 which had no ocelli, but was five inches in length. A 

 Planaria tasmaniana, found in the forests of Van Diemen's 

 Laud, was furnished with ocelli, set all round the margin of 

 the foot. 



Darwin (Annals Nat. Hist, xiv, p. 240) has also added the 



