94 Mr Daly ell on the Propagation of Scottish Zoophytes, 



beyond that of the gemmule or oxmni^ and possibly bearing 

 nearly the same relation to it as the larva or caterpillar bears 

 to the ovum of insects. Neither can I at present view the va- 

 rious, protracted, interrupted, alternate motion and quiescence 

 of these beings, otherwise than as resulting from animation ; 

 thence necessarily ascribing to them such characteristics as are 

 inconsistent with the technical description and nature of an 

 ovum. They repose permanently, also, on advancing still 

 another stage, as the larva on entering its second state, which, 

 though less conspicuous, does ensue with the actinia, and is 

 amply demonstrated by the sertulariae, flustrae, and alcyonia ; 

 and this repose terminating in apparent decay, is preparatory 

 to the existence of that original hydra, which founds the spe- 

 cimen generating a thousand others from its basis. 



Favourable conditions may enable more successful natural- 

 ists to prosecute the history of the two beings allied to the me- 

 dusae, and to ascertain whether any analogy subsists between 

 the propagation from the sac on the face of the hydra of the 

 Tubularia indivisa, and the propagation from the pendulous 

 nidus on the face of the Hydra tuba. 



Some of the animalcula infiisoria may be probably found 

 the progeny of zoophytes in an intermediate stage. 



flf Fig. 1. Animal from the vesicle of the Sertularia dichotoma ; crest a ; tenta- 

 cula, b. enlarged. 



^. Fig. 2. Animal from the disc of the Hydra tuba ascending; crest «; arms b" 

 Fig. 3. The same quiescent — both figures enlarged. 



