IIVDROZOA, 



VJ 



termed gastropores, ami the ductylozooids in sinuU.r pits u-rined daclv- ,. i,,- i 

 lopores, the pores being usually arranged in systems (Figs. i:. and Ik"). 



M1LLEFOHID.E. Milhpora forms massive laminate or Ijraudied Caws 4. 

 growths, and presents a great variety of forms ; but, according Uj Prof. 

 Hickson, there are no defiiiiti' speeific characters separating one form 

 from another, and consequently we nuist regard the forty or more 

 so-called species as mere variations of only one species, viz., Jlillejjuru 



Fi.;. 10. 



. *. 



Monocaulus imperator. upper third. (Much reduced.) 



alricornis,ov the Stag's Horn Millepora. He would call, for instance, 

 Jf. rcrrurom (Case 4, upriglit portion) JA. (/hirin/iis,fiu-.[vs>. nm/rnsa. 

 It seems that an eml)rv<i settUiig down on a broad surface with 

 room to spread forms a laminate growth, such as the typical .]f. 

 alckornis or M. complavata (Case 4) ; but if it settles on a small 

 o])jectit tends to forma branching growth. JA///^/wv/ often encrusts 

 old bottles, &c. ; in Case ?>\ a delicate network of Fan ( '<>ral is exhilMt4'<l 

 coated with a thin crust of Mi/I^'/>oni ti/rironiis. Systems consisting 

 of small gastropores, surrounded by irregnlar circl--^ .■'" •d'om six still 



K 



