IDMONEA SEHPENS. 453 



IliMUNEA SERPENS, LillUBCUS. 

 Plate LXI. figs. 2, 3, and Plate LX. fig. 2. 



SMALL PURPLE ESUIARA. Kills, Cor. 74, no. 6, pi. xxvii., e, E. 

 TUBIPORA SEKPE.NS, Linn. Syst. Nat. ed. 12, 1271. 



MlLLEPOHA LILIACEA, 1'dll. Elcllch. 21 s . 

 MlLLEPOKA TUBULOSA, /.//. J~ Sol. Zoopll. 136. 



Ti-BULiPORATHANsvEKSA, Liimk. An. 8. V. ed. 2, ii. 242: Lamx. Expos. Metli. 

 1, pi. Ixiv. fig. 1 (after Ellis) : Malnv. Actinol. 424 : Fischer, 

 Bryoz. du Sud-ouest de la France (1870), 10. 



IDMOXKA TKAX.SVKRSA, ^f.-Edw. Ann. Sc. Nat. stir. 2, ix. 218, pi. ix. fig. 3: 

 D'Orb. Pal. Fr. terr. cr6t. v. 731. 



? IDMONEA DILATATA, id. loc. cit. 731. 



OBELIA TCBULIFERA, Lamx. Exp. Meth. 81, pi. Ixxx. figs. 7, 8 (young state 

 of the present species) : (REPTOTUBiGERA)D'0/-6. loc. cit. 752. 



? REPTOTUBIGERA CONFLUENS, id. loo. cit. 



TUBI-LIPOKA PORAMINCLATA, Bloinv. Actinol. 425, pi. Ixii. figs. 3, 3 a. 



Tufii'LiPORA SEKPKXS, Flem. B. A. 529: Couch, Corn. Faun. iii. 105, pi. xix. 

 fig. 6 : Johnst. B. Z. 2nd ed. 275, pi. xlvii. figs. 4-6 : Alder, 

 Northumb. Cat., Trans. Tyiies. Nat. F. C. 1857, 46 (sep.) : 

 Busk, B.M. Cat. iii. 25, pi. xxii. : &c., &c. 



IDMUNEA SEKPEJJS, Van Ben. Bull. Ac. Roy. Belg. rri. no. 12, 647 (5 sep.), 

 pi. i. figs. 7-9 : Smitt (subgen.), loc. cit. 399, pi. iii. figs 1-5, 

 and pi. ix. figs. 1, 2. 



Zoarium cither wholly adnate or attached by the base, the 

 branches growing erect ami free, composed of lobes 

 which are dichotomously divided, slightly expanded and 

 usually bifid at the extremities, of a purplish colour, 

 vitreous and punctate, the dorsal surface striated lon- 

 gitudinally. Zocecia disposed on the branches in promi- 

 nent, oblique, semialternate series, more or less curved 

 outwards above, usually connate, sometimes free to- 

 wards the extremities, the cells in each series increasing 

 in height from the outer side inwards. 



Var. a (radiata). Zoarium regularly radiate in form, 

 attached by a central disk, the branches disposed round 

 it, free and suberect, generally bifid at the extremities. 



-pccics varies much in appearance according to its 



