1. IDMONEA. 15 



constituted of five cells diminishing in length from within outwards, 

 pretty closely connate. Surface spotted with white." 



Idmonea meueghinii, Hell. I. c. p. 120, pi. iii. figs. 6, 7. 



Hah. Adriatic Sea. 



14. Idmonea triforis, Heller. 



" In habit like the preceding, only that the branches are more 

 attenuated, and there are only three cells in each series." 



Idmonea triforis, Hell. I. c. p. 120. 



Hah. Adriatic. 



15. Idmonea tubulipora, Meneghini. 



" Zoarium expanded horizontally, the numerous branches radia- 

 ting from a central point ; lateral series regularly alternate, oblique, 

 not simple as in other species, but consisting of two or three rows of 

 cells, which are closely connate." 



Idmonea tubulipora, Menegh. I. c. p. 12 ; Heller, I. c. p. 120. 



16. Idmonea dilatata, D'Orb. 



" Rose-coloured when fresh; branches short and very wide, smooth 

 or longitudinally striated beneath ; the series of cells form, as it 

 wei'e, projecting horns on both sides, each contains six cells pro- 

 duced into long salient tubes." 



Idmonea dilatata, D'Orb. Pal. Franq. p. 731. 



Hab. He de Re. 



17. Idmonea angustata, D'Orb, 



" Branches only half as wide as in the preceding, a)id much 

 thicker, compressed, the lateral series composed of three very long 

 free cells, which are wide apart." 



Idmonea angustata, D'Orb. I. e. p. 731. 



Hah. Banks of Newfoundland. 



18. Idmonea rustica, D'Orb. 



" Irregularly branched ; branches as much compressed as in /. 

 dihtata ; the series of cells much more closely approximated and 

 indistinct in the middle of the branches, each composed of 4-5 cells ; 

 dorsal surface wrinkled, transversely punctate." 



Idmonea rustica, D'Orb. Pal. Franq. p. 731. 



Uab. Manilla, Hongkong, Macao, Chusan archipelago (D'Orh.). 



