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EXPLANATION OF PLATE IX. 



Fig I. Portion of a colony of Plumatella repens, sketched from life, 



showing zooids in various states of expansion. (Original.) 

 Figs. II. and III. Statoblasts of Plumatella, surface and edge view. 



(Original.) 

 Fig. IV. Edge view of a statoblast of Cristatella mucedo, showing the 



projection of numerous barbed spines. (After Alhnan.) 

 Fig. V. Anterior part of the body of Lophopus, seen from the right 



side. The free ends of the lophophore and of the tentacles are cut 



off. (After Allman.) 

 Fig. VI. Life appearance of a colony of Bowerbankia imbricata, nat. 



size. (Original). 

 Fig. VII. A cluster of zooids of the same, fully expanded. (After 



Hincks.) 

 Fig. VIII. A calcareous colony of Lichenopora hispida, showing two 



ooecia in the centre. Drawn from Nature. (Original.) 

 Fig. IX. Two colonies of the same, nat. size. 

 Fig. X. Pedicellina cernua, showing the full expansion of the tentacles. 



From life. (Original.) 

 Fig. XI. A cluster of Pedicellina cermta on a filament of seaweed, nat. 



size. (Original.) 

 Fig. XII. Diagram of the structure of a Bryozoon zooid in attracted 



condition. (Original.) 



Fig. XIII. The same in a state of expansion. (Original.) 

 LETTERING : a. anus ; ep. epistome ; /. funiculus ; g. nerve ganglion ; 



i. intestine ; m. mouth ; o. ovary ; oe,. oesophagus ; r. retractor 



muscle ; s. statoblasts ; st. stomach ; t. testis ; v. cesophageal 



valve. 



CLASSIFICATION : 



CLASS. BEYOZOA ( = POLYZOA). 

 Sub-Class I. ENTOPEOCTA ; Anus opening within the lophophore ; 



no body cavity ; tentacles non-retractile. 

 Family a. Pedicellinidse colonial. 

 Family b. Loxosomidae solitary. 



Sub-Class II. ECTOPEOCTA ; anus opening outside the lophophore 



area ; well-developed body-cavity (coelom) ; tentacles retractile. 



Order 1. Phylactolaemata. Lophophore horseshoe-shaped ; with 



epistome ; membrane supporting bases of tentacles ; all 



fresh-water in habitat. 



Order 2. Gymnolaemata. Circular lophophore ; no epistome ; no 

 membrane round bases of tentacles ; all marine except 

 Paludicella. 



