TYPICAL OBJECTS IN NATURAL HISTORY. 117 



Classis VII. TUNICATA. 

 Ordo III. Heterobranchiata, Bl. 



1. Ascidiadae .... Ascidium intestinale . . B. 



2. ClavellinidaB . . Clavellina lepadiformis B. 

 .S. Botryllidee .... Boti-yllus violaceus .... B. 



4. Pyrosomidae . . Pyrosoma atlanticum. 



5. Salpidae Salpa democratica. 



Mollusca (continued). — G. Busk, Esq. has furnished the following list for 

 the lower groups of Mollusca. 



Classis POLYZOA. 



Ordo I. P. INFUNDIBULATA. 



Subordo I. Cheilostomata. (Celleporina.) 



§ A. Polyzoarium articulated. 



§§ a. Uniserial. 



Fam. 1. Catenicellidae Catenicella hastata. 



§§ b. Bi-multiserial. 

 Fam. 2. Salicornariadae .... Salicornariafarciminoides. . B. 

 3. Cellulariadse Cellularia Peachii B. 



§ B. Polyzoarium not articulated, but continuous throughout. 



§§ a. Uniserial. 

 Fam. 4. Scrupariadae Scruparia chelata B. 



§§ b. Bi-multiserial. 



Fam. 5. Farciniinariadae . . Farciminaria aculeata. 



6. Gemellariadse .... Gemellaria loricata B. 



7. Cabereadse Caberea Hookeri B. 



8. Bicellariadae Bicellaria ciliata B. 



9. Flustradae Flustra foliacea B. 



10. Membraniporadae . . Membranipora memhrana- 



cea B. 



Lepralia auriculata B. 



11. Celleporadae Cellepora pumicosa B. 



12. Escharadae Eschara foliacea B. 



13. Vinculadae Vincularia ornata. 



14. Selenariadae Cupularia Loioei. 



Subordo II. Cyclostomata. (Tubuliporina.) 

 § 1. Erect, not adnate. 



§§ a. Articulated, or having' the polyzoary divided into internodes united by 

 flexible joints, 



Fam. 1. Crisiadae Crisia eburnea B. 



§§ b. Polyzoary continuous throughout. 



Fam. 2. Idmoneadae Idmonea atlantica B. 



Pustulipora deflexa B. 



