84 



POPULAE ILLUSTEATIONS OF 



Fig. MO. 



-; z 



these is the house or cell of a 

 polyp ; so that in a good specimen 

 we see a kind of marine village, 

 which, under the teaching of God, 

 -y' ] has been beautifully constructed 

 by the thousand inhabitants it 

 contains." 



The last genus in the British 

 forms of the order Sertularidse is 

 illustrated in Fig. 109 (p. 82). 

 They are called Campanularia 

 because the Hydrothecae are bell- 

 shaped. Johnston figures three 

 real, and figures one and describes 

 two doubtful species six in all 

 as inhabiting our coasts. The species 

 figured looks in a natural state like 

 a small plant rising from a single 

 stem, and branching off into the 

 shape of a "horse's tail," which 



fc is the popular name given to it by 



Ellis. 



THE CALTCOPHOEiD-as. 

 The next phase in the morpho- 

 logy of the Hydrozoa is observed in 



~~3'~ a most interesting family of Zoo- 



phytes, found only far out at sea, 

 and therefore termed oceanic. It 

 will not be necessary for me to dwell 

 long upon this or the next group, 

 also oceanic viz., Physophoridse, 

 inasmuch as specimens are not so 

 accessible for examination to our 

 sea-side ramblers. But they are 

 very interesting and beautiful 

 creatures notwithstanding. The 



Fig. 110. Diphyes dispor (magnified) ; a, the 

 coenosarc ; 6, the polyp with its single ten- 

 tacle ; e, the same, covered with its hydro- 

 phyllum ; c, nectosac, or locomotive organ ; 

 d, the somatocyst; /, duct leading from the 

 hydraecium, which, joining with others, 

 forms the connection of the swimming floats 

 and the somatic cavity; g>, the proximal 

 nectocalyx, or "swimming float;" gr 2 , the 

 distal nectocalyx; i, t, the mouth of the 

 nectosac ; k, the hydraecium ; *i, the hydrsa- 

 eial canal (after Huxley). 



