Description of the Figures in Plate III. 



Figures 1 and 2, representing the female specimen, are drawn directly froin 

 the object. Figs. 3-7 are taken from the male specimen ; figs. H, 6, and 7 

 being drawn direct with tlie camera from tlie original objects, while figs. 4 and 5 

 are constructed from separate caniei'a drawings of the several pai-ts shown. Fig. 

 8 is taken from one of the specimens from Naples. 



Aphabetical Lis 



a. Racbis. 



b. Stalk. 



c. Stem. 



d. Polype. 

 dl. Leaf. 



e. Zooid. 



/. Tentacle. 



fo. Foreign body, swallowed as food. 



gr. Calyx. 



li. Cavity in calyx process. 



i. Spicule. 



L Cteoeuchym, or fleshy body 



substance. 

 ni. Mouth. 

 n. Stomach. 



t of Eeferences. 



o. Mesentei-y. 



01'. Egg of Entomostracon embedded 



in mesenterial filament. 

 p. Retractor muscle. 

 q. Protractor muscle. 

 r. Short mesenterial filament, 

 .s. Long mesenterial filament. 

 t. Ovum. 



ts. Spermatosphere. 

 u. Main canals of rachis. 

 V. Smaller canals. 

 w. Ectoderm. 

 X. Mesoderm. 

 y. Endoderm. 



showing zooids on ventral 



Fig. 1.— Dorsal view of the female specimen, x 



Fig. 2.— Ventral view of the female specimen, 



surface of rachis : also ova at bases of leaves, x |. 



Pig. 3. — Transverse section through the rachis of the male siJecimeu, with the 

 whole of the 13th left leaf, and the base of the 13th right leaf. Shows mode of 

 formation of leaf by lateral fusion of polypes ; also arrangement of zooids on 

 rachis. On the right leaf the spicules are represented, but on the left they have 

 been omitted for the sake of clearness, x 3. 



Fig 4. — Longitudinal section of a single ijolype along the line A.\ in Fig. 3 ; the 

 plane of section being the iJffinfl o/s!/)/i)?!.e(r(/, perpendicular to the flat surface 

 of the leaf : shows whole structure of a polype, x 17. 



Fig. 5. — Transverse section through six contiguous polyjjes taken along 

 the line BB in Fig. 3, cutting the several polypes at different portions of their 

 lengths. The uppermost section jiasses through the calyx and base of the 

 tentacles. The second section passes tlirough the stomach, and shows the 

 mesenteries and the arrangement of the retractor muscles. The third section 

 passes through the mesenterial filaments below the stomach, and shows their 

 division into two small and six large ones : shows also food particles in the act 

 of being digested by the filaments, and a ripe spermatosphere. The fourth, fifth, 

 and sixth sections are below the lower ends of the short mesenterial filaments; 

 they show the long filaments, and the various stages of development of the male 

 reproductive organs, x 25. 



Fig. 6. — Transverse section through one of the smaller spicules, x 400. 



Fig. 7. — Transverse section through a large spicule, x 400, 



Fig. 8. — Separate view of bare stem, x |. 



