328 SIR SIDNEY F. HARMER ON 
Type 17 (fig. 17). — Proximal segments of F and G in contact (rarely- 
separated), longer than the corresponding parts of J and K. The joints are 
on the distal sides of G and D, lying hardly in advance of the axil, and they 
traverse the zooecia FJ and GK, passing through the opesia of F and G, the 
two in7ier zorecia. Kootlets given off on the distal sides of the joints. — 
Menipea. 
Type 18 (fig. 18). — The internode becomes triserial by the development oB 
a median row of two or more zocecia. The distal member of the median row 
(E^ in the figured specimen) behaves as an axillary zocEcium. Bifurcation 
in other respects as in type 17. — Menipea (triserial species). 
Type 19 (fig. 19). — Part of a sympodial colony of Menipea spicata, only 
one of the branches being jointed at each bifurcation. 
Type 20 (fig. 20). — Agreeing with type 8 except for the intercalation of a 
median series of zooecia in the internode. — Amastigia kirkpatricki (Lev.^ 
MSS.),n.sp. 
V. Characters of Certain Genera and Species of 
SCRIIPOCELLAEIID^. 
Family SCEUPOCELLAEIID^. 
Cellulariidae, Hincks, 1880, p. cxxxvii ; Busk, 1884, p. xxii ; MacGillivray, 1887,, 
Trans. Pi'oc. R. Soc. Vict, xxiii. p. 199; et auctt. 
Scrupocellariidaj, Levinsen, 1909, pp. 89, 130; Caim & Bassler, 1920, U.S. Nat. 
Mus., Bull. 106, p. 180. 
A diagnosis, based on Levinsen's study of the Family, has been given by 
Canu and Bassler, and this may be accepted with but few modifications. 
The Family consists of Anascous Cheilostomata, of erect habit, usually much 
branched, and attached by rootlets. With rare exceptions the zoarium is 
unilaminar, and the branches are biserial in the majority of species. The 
branches are nearly always flexible, well-developed chitinous joints occurring 
in most cases. The opesia is large, and spines usually occur distally or at the 
sides of the orifice. A specially modified spine, the scutum or fornix, jointed 
at its base, projects horizontally over the opesia, being branched or broadened' 
except in the region of its narrow stalk ; but it may be completely wanting. 
The full equipment of heterozooecia consists of (1) an aviculariuni, or a pair 
of avicularia, on the frontal surface, typically on the proximal side of the 
opesia, and with the rostra directed proximally. The frontal avicularia on 
the distal side of an ovicell are commonly paired and directed distally ; 
(2) a lateral or marginal avicularium at the outer distal corner of the 
zoo3cium ; (3) a basal heterozooecium, which may be either an avicularium 
or a vibraculum, on the basal surface, at the proximal end of the zocecium^ 
usually in contact with the lateral avicularium of the preceding zooecium. 
The heterozooecia are not jointed at their base, and any or all of them may 
