154 TRANSACTIONS LIVERPOOL BIOLUGICAL SOCIETY. 
weed lying in an inch or so of water in sandy tide-pools 
at Roscoff. The sea-weed upon examination proved 
to be a multitude of Convoluta schultz which were 
basking in the sunlight in a most conspicuous way. 
Suspecting that this was a purposeful action, Geddes 
experimented and ascertained that the green bodies evolved 
oxygen and formed starch, while a most disagreeable 
odour (resembling that of trimethylamine) was exhaled, 
which probably rendered the animals free from attack and 
thus enabled them to enjoy the direct sunlight. 
The green bodies consist of cells containing one or 
more chloroplasts, one or more pyrenoids, and rod-like 
masses of starch. In the present species (C. paradoxza) 
similar bodies but brown in colour are present. The 
physiological action of the brown bodies has not been 
tested. That of the green cells of C. roscoffensis has 
furnished the basis for recent work by Haberlandt* and 
his conclusion, if correct, in all probability will be found 
to apply to C. paradoza. His hypothesis is to this 
effect. The green bodies are physiologically alge, that is, 
are descended from algze, ‘‘ which at the present time owing 
to profound adaptation in and with the Convoluta, have 
lost their independent algal character and now constitute 
an integral histological element, the assimilating tissue 
of the Convoluta.” + 
Littoral species of animals adopt various devices in order 
to resist the attacks of the waves. Convoluta paradoxa 
adopts a method which, as Professor Herdman tells me, is 
paralleled in the Nudibranch Ancula cristata.t The “tail” 
or pointed hinder extremity of the body is provided with 
sticky adhesive papille which enable C. paradoza to 
*v. Graff, ‘‘ Accela,” 1891. 
+See Lankester ‘‘ Nature,” vol. XLIV., 1891, p. 465. 
+See Trans. Biol. Soc., Vol. 1V., p. 135. 
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