Fig. 



PLATE XL. 



EXPLANATION. 



1. Vaginicola CRYSTALLINA, Ehr., vol. ii. p. 715. — Lorica containing two zooids, 



X 200. 



2. Stylocola striata, From., vol. ii. p. 730, x 300 (De Fromentel). 



3. Vaginicola GLOBOSA, D'Udk., vol. ii. p. 7 16, dimensions unrecorded (D'Udekem). 



4, 5. Thuricola valvata, Wright sp., vol. ii. p. 718. — Loricae with two zooids in an 

 expanded and contracted state ; v, valvular structure, x 200 (Str. Wright). 



6-S. Thuricola folliculata, Miill. sp., vol. ii. p. 718.— 6, Fully extended zooid 

 with at vv lateral edges of pectinate valve, x 200; 7 and 8, distal region 

 of lorica showing pectinate structure of valve, x 400. 



9, lo. Cothurnia imberbis, Ehr., vol. ii. p. 720. — 9, Lorica containing two zooids, 

 that at a in a contracted condition, having developed a subcentral ciliaiy 

 girdle preparatory to migration, x 200; 10, detached migratory zooid (Greeff). 



11. Cothurnia pontica, Meresch.,vol. ii. p. 725. — Empty lorica, x i5o(Meresch- 



kowsky). 



12. Cothurnia gracilis, S. K., vol. ii. p. 724. — Zooid contracted, x 250. 



13-15. Thuricola operculata, Grubcr sp., vol. ii. p. 719. — 13 and 14, Expanded zooids, 

 showing at op valve-hke operculum, and at / retractile ligament that connects 

 the same with the body at the bottom of the lorica ; 15, basal region with the 

 operculum and retractile ligament diagrammatically represented (Gruber). 



16. Pvxicola socialis, Gruber sp., vol. ii. p. 728. — Distal region of expanded zooid 

 with at m collar-like membrane, dimensions unrecorded (Gruber). 



17, iS. Cothurnia compressa, C. & L., vol. ii. p. 722. — Front and lateral aspects, 

 X 170 (Claparfede & Lachmann). 



ig. Cothurnia havniensis, Ehr., vol. ii. p. 720, x 100 (Ehrenberg). 



20,21. Cothurnia patula, From., vol. ii. p. 722. — Lorica with two zooids in their 

 expanded and contracted states, x 200 (De Fromentel). 



22. Cothurnia Cohnii, S. K., vol. ii. p. 723, x 400 (Cohn). 



23. Cothurnia pupa, Eichw., vol. ii. p. 724, dimensions unrecorded (Eichwald). 



24, 25. Cothurnia Sieboldii, Stein, vol. ii. p. 720. — Ventral and lateral aspects, x 150 

 (Stein). 



26. Cothurnia astaci. Stein, vol. ii. p. 721, x 150 (Stein). 



27. Cothurnia CURVA, Stein, vol. ii. p. 721, x 300 (Stein). 



