PLATE 17. 



Fig. 24. — Cyphonautes occidentalis sp. nov. The larval stage of M. viUosa 

 showing the organism in optical section as it appears while still living and 

 lying on its side. X 70. 



Fig. I24a. — C. occidentalis. Showing the margin of the first two zooeeia 

 (a) and (b) through the transj^arent shell (sit.) still adherent to the sub- 

 stratum. X 30. 



Fig. 24b. — M. villosd Hineks. A young colony of three zooeeia still 

 carrying the shell of the larva. X 30. 



Fig. 25. — M. villosu. A young colonj' of five zooeeia. X 30. 



Fig. 26. — Microponi coriacea Esper. A few zooeeia showing raised mar- 

 gins, foramina (for.) and ooecia (oe.). X 30. 



Fig. 27a. — ThcdamoporcUu rozicri Audouin. Habit sketch of a portion 

 of an incrusting colony. Natural size. 



Fig. 27. — T. rozieri. Habit sketch of a })ortion of a branching colony. 

 Natural size. 



Fig. 28. — T. rozieri. A few zowcia in the adult condition showing oper- 

 culum (op.) and posterior portion of orifice (/*. or.) ; also foramen (for.) 

 and blunt process {hi. pro.). X 30. 



Fig. 29. — T. rozieri. Three zooeeia showing great size of the bilobate 

 ocecia {oe.) and the diminutive size of the zooeeia bearing them. X 30 . 



A 



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