113 



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 Phimatella, surface and edge view. 



(Original.) 

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



projection of numerous barbed spines. (After Allman.) 

 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.) 

 Fi<*. VI. — Life appearance of a colony of Boioerbanhia 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. XL — A cluster of Pedicellina cernua on a filament of seaweed, nat. 



size. (Original.) 

 Fig. XII. — Diagram of the structure of a Bryozoon zooid in a retracted 



condition. (Original.) 

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

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



i. intestine ; m. mouth ; o. ovary ; 02. oesophagus ; r. retractor 



muscle; s. statoblasts; si. stomach; t. testis; v. oesophageal 



valve. 



Classification : — 

 Class.— BEYOZOA ( = POLYZOA). 

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

 no body cavity ; tentacles non-retractile. 

 Family a. — Pedicellinidae — 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. 



