REPORT ON THE POLYZOA. 
135 
(1) Microporella 'per sonata (Busk). 
(2) Microporella malum (Audouin). 
(3) Microporella ciliata (Pallas). 
The peculiar habit of growth of the Flustra marginata of Krauss, and which is also 
presented in the very closely allied Eschar a jlahellaris , Bk., was apparently regarded by Dr. 
Gray as sufficient for a generic distinction. But that it is not so is obvious from the cir- 
cumstance that a similar condition obtains in species belonging to widely distinct genera. 
It appears to me, therefore, convenient to merge all the erect bilaminar Microporellidan 
species, whether with or without the flexible fasciculate stem and marginal bundles of 
tubes, into one group for which Dr. Gray’s name might be retained, but which, since they 
agree in all more essential characters, should perhaps be regarded more in the light of 
a sub-genus than as absolutely distinct from Microporella. 
§ a. Erect, bilaminar. 
1. Flustramorphci, Gray. 
Flustramorpha, Gray. 
Flustra (sp.), Krauss. 
Fschara (pars), Auctt. 
Mastigophora (sp.), Hincks. 
Character. — Zoarium erect, radicate, bilaminar, composed of irregular lobes, bordered 
and loosely interconnected by chitinous tubes ; mouth coarctate ; a lateral pouch-like 
vibracularium. 
(1) Flustramorpha marginata , Krauss (sp.) (PI. XX. fig. 8). 
Flustra marginata , Krauss, Corail, und Zooph. d. Siidsee, p. 35, fig. 3. 
Flustramorpha marginata, Gray. 
Character. — Zoarium composed of strap-shaped lobes 
dividing more or less regularly in a furcate manner, and 
bordered by a bundle of chitinous tubes continuous down- 
wards into a peduncle. Zooecia broad, ovate, or sub- 
hexagonal, flattened in front, and separated by shallow 
sulci. Mouth arched above, contracted below (coarctate) ; 
lower border straight, entire, smooth ; a lunate pore whose 
lower edge is toothed ; on one side of the front a large 
pouch-like vibraculum with a long setose flagellum. 
Surface finely granular. Ocecia globose, prominent, 
though slightly immersed at the base. 
Habitat. — Station 142, lat. 35° 4' S., long. 18° 37' E. ; 150 fathoms, green sand. 
Off Marion Island, 50 to 75 fathoms. 
[Natal, Bolton ; South Africa, Krauss]. 
Fig. 39 . — Flustramarpha marginata. 
a, Operculum ; b, mandible. 
