OF MADEIRA AND NEIGHBOURING ISLANDS. 295 



plates and names the species Catenicella Savignii, instead of C. Contei, 

 which it should have been. 



3. D'Orbigny at last establishes a genus Catenaria (Paleont. Fran., 



Cretace Brjoz. 1850, p. 42) and his first species is Eucratea Lafontii, 

 Aud. 



4. Busk (Cat. Polyz. Brit. Mus. 1852_, p. 13) established a genus Alysidium, 



in which he placed two species, A. parasiticum and A. Lafontii. If 

 the genus is retained it will be with A. parasiticum as its type, and 

 A. Lafontii omitted from it. 



5. Busk, 'Challenger' Report, 1884, p. 14, gives ^'■Catenaria, Savigny. 



. . . The typical species I have assumed for this genus is the Eucratea 

 Lafontii of Audouin.'^ Read " Catenaria, d'Orbigny,^' and the type is 

 right, but other species placed by Busk under the name in this report 

 can scarcely be considered congeneric with the type. 



Catenicella Contei {Audouin). B. (PI. 42. figs. 1-3.) 



1828. Eucratea Contei, Audouin, Savigny's Egypte, pi. 13. fig. 1. 

 1834. Catenicella Savifinyii, Blaiuville, Man. d'Actin. p. 462, pi. 78. fig. 5. 

 1860. Catenicella eleyans, Busk, Quart. .Journ. Micr. Sci. vol. Yiii. p. 280 (nee Cat. 

 elegnns, Busk, Brit. Mus. Cat. Polj^z. p. 10, pi. 9). 



I figure two primary zooecia which I found growing on a Lepralian at 

 Madeira, and also a portion of a specimen from the Johnsonian Collection 

 at Madeira labelled C. elegans ; moreover, Busk^s own specimen from 

 Madeira, now in the British Museum, is similarly named. It is obvious that 

 a mistake was made, and that the species is really C. Contei, Audouin, the 

 type of the genus ; but it is curious thati the artist did not figure the vittse 

 which are present, and, moreover, are characteristic of all allied forms. 



Catenaria Lafontii [Audouin). B., W. 



1828. Eucratea Lafontii, Audouin, Savigny's Egypte, pi. 13. fig. 2. 



1850. Catenaria Lafontii, d'Orbigny, Paleont. Fran., Cretace, p. 43. 



1852. AlysicUum Lafontii, Busk, Cat. Marine Polyz. Brit. Mus. p. 14, pi. 14. figs. 1-4. 



1884. Catenaria Lafontii, Busk, Pteport ' Challenger,' Polyz. p. 14. 



In records from Madeira Busk called it Eucratea Lafontii, and Waters 

 Alysidium Lafo7itii. I found small pieces attached to Lagenipora Costazei, 

 and the Funchal Museum was well supplied with the species, which was 

 found growing on a fisherman's basket. 



Grenus Halysisis *, n. g. 

 Zoarium chain-like, each zooecium forming a separate link, jointed to the 



* akvcris a chain ; many genera having been formed from this root has necessitated the 

 form of the last syllable. 



