MARINE POLYZOA. 91 



7. ESCHARA DECUSSATA. PI. CVII. figS. 4, 5, 6. 



Cells ovate, mostly separated by raised lines, between which 

 and the central ovate portion of the front is a shallow sulcus ; an 

 avicularium with an acute mandible pointing upwards on the 

 middle immediately below the subcrescentic mouth. 



Eschara decussata, M.-Edw., Lamk. ed. 2. ii. p. 267 ; M.-Edw., 



sur les Eschares, p. 40. pi. 4. fig. 2. 

 Hab. Seas of Australia, Macaillivray. 



Whatever obscurity may attach to E. lichenoides, M.-Edw., 

 there can be no doubt about the present species being the one 

 intended by that author. 



8. ESCHARA FLABELLARIS. PL CVII. figs. 7, 8, 9, 10. 



Polyzoary flabellate, attached by a flexible stem composed of 

 horny tubes. Cells ovato-ventricose, punctured ; a crescentic 

 pore a little below the mouth, and an avicularium on the side 

 and upper part of the cell; mandible acute, pointing directly 

 outwards. Ovicells globose, prominent, subgranular or smooth. 



Hab. Algoa Bay. 



9. ESCHARA GRACILIS. PL CVIII. figs. 5, 6, 7- 



Polyzoary composed of slender, slightly compressed, subcylin- 

 drical branches. Cells deeply immersed, pyriform, bulging 

 above ; an elongated central pore (? avicularium) ; in the quite 

 young cells a mamillary projection on each side a little below 

 the mouth ; mouth orbicular, with a minute denticle below. 



Millepora tenella, Esp. SuppL i. t. 20. 



Eschara gracilis, Lamouroux, Encyc. p. 375; Blainville, Man. 



d'Actinol. p. 428 ; Lamarck, An. s. Vert. ii. 268. ed. 2 ; M.- 



Edwards, sur les Eschares, p. 28. pi. 2. fig. 2. 

 Hab. Bass's Strait, parasitic on Catenicella elegans ; Macgilli- 



vray. 



The closed cells noticed by M. -Edwards are not improbably 

 ovicells. 



10. ESCHARA GIGANTEA, n. s. PL CXIX. fig. 3. 



Polyzoary very thick and solid, lobes wide, undulated. Cells 

 smooth, solid, ventricose, ovate or subhexagonal, immersed and 

 coalescent ; a deep penthouse-like projection above the mouth, 

 the lower lip of which projects. 



Hab. South Patagonia, Darwin. 



