General History of the ^farine Poli/zoa. 1G9 



tically from the same locality, and since, as I have pointed 

 out, the peculiarities in the description of Si/ntethijs can be 

 easily accounted for on the supposition that Forbes and Good- 

 sir's specimens were, like the Duke of Argyll's, the Diazona 

 violacea of Savigny. 



XX. — Contributions towards a General History of the Marine 

 Polyzoa, 1880-91. — Appendix. By the llev. Thomas 

 HiNCKS, B.A., F.K.S. 



[Continued from p, 93.] 



^ Annals,' November 1880 (p. 28 sep.) 

 Steganoporella Rozierij Audouin. 



I have taken this species as the type of a new genus, Tha- 

 lamoporeUaj distinguished from Steganoporella by important 

 differences in the internal structure of the zocecium *. 



Ibid. (p. 29 Sep.). 

 Steganoporella elongata^ sp. n. 



This species must be referred to the genus Micropora. 

 The structure of the Steganoporellidas had not been thoroughly 

 investigated when my description of it was published ; later 

 researches have shown that it is not a member of this family, 

 but finds its proper place in the kindred tribe of the Micro- 

 poridee. 



Ibid. (p. 30 Sep.). 

 Steganoporella Jervoisii^ sp. n. 



This form belongs to the genus Thalamoporella. The list 

 of the recent species of Steganoporella which I have given 

 (p. 30) is from the cause just mentioned defective. The 

 first of the species which it contains, Eschara impressa^ 

 Moll, must be removed from it. Of the rest, Flustra Rozierij 

 Audouin, Memhranipora gothica^ Busk ( = 4?. Rozieri^ form 

 goihica^ mihi), and Steganoporella Smittii^ Hincks, belong to 

 the genus Thalamoporella j Memhranipora magnilabrisj 

 Busk, is the only representative of the genus Steganoporella 

 as now defined, 



* "Critical Notes on the Polyzoa," < Annals ' for Feb. 1387, pp. 163, 

 164. 



