PLATE LXXXIII * 



Larval forms. 



no. 



1. LoxosoMA singulare; larva in the act of swimming. 



2. TuBULiPORA FLABELLARis (? FIMBRIA of the present 



work) ; general appearance of the free larva. 



3. Alcyonidium mytili ; free larva, front view. 



4. MiCROPORELLA ciLiATA; free larva, viewed in profile. 



5. Cellepora pumicosa ; free larva. 



6. BuGULA flabellata ; free larva. 



7. EucRATEA chelata; free larva, viewed in profile. 



8. Valkeria uva, form cuscuta; free larva, front view. 



9. Membranipora pilosa ; larva {Cyphonautes co/ti- 



pressus) immediately after liberation. 



10. Flustrella hispida ; free larva. 



Lettering of the Figures. 



S. Oral surface. 



I. Aboi-al surface. 



C. Ciliary corona. 



ph. Pharynx. 



ce. ffisophagus. 



E. Eectum. 



est. Stomach. 



o. Mouth of the gastrula. 



ms. Oral mesoderm. 



mi. Aboral mesoderm. 



cc. Cavity of the body. 



CD. Digestive cavity. 



oc. Eye-speck. 



Jl. Flagellum. 



pi. Ciliary plume. 



vt. Sucker. 



V. Adhesive organ. 



sb. Furrow separating the aboral 



mass and the surface bearing the 



ciliary corona. 

 si. Furrow separating the sucker 



and the lower portion of the 



aboral surface. 

 RM. Maximum point of the aboral 



mass. 

 RV. Border of the sucker. 

 r. Great retractors. 

 va. Tactile organ (in Lo.xosoma). 

 mp. Pigment of pharynx (in Alci/o- 



mdittm). 



Obscure portion of the body- 



cavity between the two branches 



of the stomach. 



Lateral diverticulum of the 



foi-egoiug. 

 coq. Shell (in Ci/phonautes). 



cc. 



cce 



* The figures in this Phite are all copied, by the author's kind permis- 

 eion, from Dr. J. Barrois's admirable work on the Embryology of Ihe 

 Polyzoa, with the exception of fig. 6, which is after IS'itsche. 



