214 



INA'Kiri'KIM/A'I'l', AXniAI.S. 



in commuiiicatiuii witli fine anotluT l)y a small tul)^' <iv "sijilmncle." 

 Tlie sliell tliun constituted is liuried in the mantle at the liinder 

 end (if the Imdv (tii,'. l-"i4). Ijastl\,iu the eurions extinet group of 

 the JSilniiiiilrx^ which alsu lieldug hei'e, the elimgati'd body was 

 supjiiirteil liy a long dai't-likc intcvnal skeletim, the chief portion 

 of which ciinsisted of a cylindrical jminted tihrnns Imdy, called the 

 "guard." In front, the guard was hiiUdwcd out into a conical 

 cavity, in "which was hidgeil a singular series of rhanilicrs, united 

 liy a tulic i:r " siphnuclr," and fni'ining c:illectivcly \vh:;t is called 



Fi;,' ir,j.--o Ilitcn 



.■ SlirU (■' )illl 



.11 nr Sr,,;„ „,,/,./,. ; /, Vvn n|- 1 1 , .<! , nl, I, Ih I ^ fi - Hlfll,. «a / 



the " phragmacdue." In fr^ut of that, again, the skeleton was ]iro- 



lo}ig(.Ml fdi'ward into a i i' nr less extensixely ih'\cliiiied horny 



exjiaiisidu or '' pen," 



The second nid,.r of the C,y,/„, /„/;„,/,, —that of iJie Te/rahran- 

 I'/iiiita — comprises forms char.iclei'iseil hy lieing creeping animals, 

 ]irotected hy an ,:r/,-nni/ m.i iii/-rh,iiHl,n;;l xhrll^ the partitions be- 

 tween till' chambrrs being pei-roraled for the |i;iss:ige of a lueiu- 

 biaiioMs oi' calcareous tube, termed I lie " siphiuiele." 'The arms ai'e 



llore I li;i]i leu 



nuuiiier, ami are ^\r\ 



le\ oid of suckers ; I he 



gills are 



