£30 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
are somewhat larger, and from Zanzibar there is a larger form which I 
believe to be a new species. 
VITTATICELLA ContEt (Audouin). (Plate 10. figs. 1-4.) 
Eucratea Contei, Audouin, “ Descr. de Egypte,” Hist. nat. p. 242; Savigny, on plate 
13. fig. 1, calls it “ Catenaires ” *. 
Catenicella Savigny?, Blainville, Man. d’Actinologie, p. 462, pl. 78. fig. 5 (1834). 
Catenicella Contet, d’Orb. Pal. Frang. vol. v. p. 44 (1850). 
The zoarium has usually one or two single globule, and then a geminate 
one, and a new branch may also occasionally grow with a corneous connection 
from the anterior surface of a globula. There are radicles from the dorsal 
surface, though frequently radicle chambers exist without the radicles being 
developed. Neither the growing stolons nor the earliest zocecia have been 
found. Zocecia elongate, contracting to the base, with a narrow vitta on each 
side; a spinous process, varying considerably in length, at each upper corner; 
but apparently without avicularia, and in stained preparations these processes 
were found to be empty. 
The oral aperture is nearly round, but rather flattened on the proximal 
edge ; the operculum is smaller than in any other species of Catenicellide 
which I have examined, and the muscular attachments are at the side. The 
compensation sac is very short. 
There are 12 tentacles.. According to Maplestone there are also 12 
tentacles in C. lorica, Busk, and C. ventricosa, Busk. The ovicells are 
unknown. 
_ The species was first figured by Savigny, whe placed it in his genus 
Catenaria, which apparently included this and Alysidium Lafontu (Aud.), 
but Audouin in his description called them both EHucratea; next Blainville 
modified the name Catenaria to Catenicella, for which verbal change there 
was no justification, and Conte: was the type which he again figured, but his 
genus included Hippothoa divaricata, from which part of his generic descrip- 
tion was written, in fact he says perhaps Conte is the same as H. divaricata, 
Lamx. It will thus be seen that the genus Catenicella should never have 
been made, and that it is a synonym of Catenaria; nor was Blainville 
justified in changing the specific name and calling the species Savignyi. 
Several of Audouin’s species were similarly re-named by d’Orbigny. 
For this division of the Catenicellide MacGillivray has made a new 
* It may be well to call attention to the fact that Savigny always used the plural form of 
the generic name on his plates, even when there was only one species. On the present plate 
(13) there are the names of three genera, while there are only four species, so that we can 
only presume which species Savigny meant to join together, and apparently Audouin was 
in the same position as we are. Audouin placed the first three species in one genus, but 
now they are put in three. 
