1912.| N. ANNANDALE: Fauna Symbtotica Indica, i. 125 
(also recumbent) branches originating from lateral buds; some- 
times more than one lateral bud on each side of a zooecium. 
Zooecta membranous, hyaline, oval, very flat but with the 
margin supported by vertical chitinous rods; orifice situated 
at the summit of an elongate but slender vertical tubule which 
rises from near the anterior end of the dorsal surface of the 
zooecium. Parietal muscles consisting of short vertical strands 
situated round the periphery of the zooecium within the chitinous 
rods. Gonads arranged round the margin of the zooecium just 
within the parietal muscles. 
Polypide elongate and slender; tentacles not numerous; no 
gizzard or cardiac antechamber. : 
Platypolyzoon investigatoris, sp. nov. 
Zoarium with comparatively few lateral branches, forming 
a sparsely ramifying figure ; no branches with subsidiary branches 
observed ; rarely more than one lateral bud on each side of a 
zooecium, not more than two observed; the terminal bud of a 
branch sometimes drawn out into an elongate, slender process. 
Zooecia oval, measuring about Io mm. by o-5 mm.; colour- 
less except for the chitinous rods, which have a yellowish tinge. 
Orificial tubule of great relative length, very slender. Parietal 
muscles forming short, vertical, somewhat fan-shaped strands 
with the narrow end arising from the inner surface of the ventral 
wall and the broad end attached to the dorsal wall of the 
zooecium. 
Polypide with the tentacles very long; the stomach slender 
and elongate ; the retractor muscles delicate. 
Habitat, etc.—Attached to the telson of two of the type 
specimens of Sgutlla investigatoris, Lloyd, from off the S. W. Coast 
of Arabia; 110 fathoms (R.I.M.S. ‘‘ Investigator ’’). 
The affinities of the new genus and species are somewhat 
doubtful. The zooecia have a superticial resemblance to those of 
Flustrella and it is possible that fF. flabellaris, Kirkpatrick,! from 
the China Sea may be related. Nothing, however, seems to be 
known about either the method of budding or the anatomy 
of Kirkpatrick’s species. The structure of the orifice and the 
method of budding of P. investigatoris differ greatly from those 
found in F. lispida (Fabr.), the type-species of its genus, and 
possibly the former is related rather to Avachnidium, from which, 
however, it differs in that the zooecia are not separated by stolon- 
like processes. This is perhaps a difference of no great morpho- 
logical importance, for the terminal bud in the branches of 
P. investigatoris sometimes takes the form of a slender elongate 
process. The form of the zooecia and the general appearance of 
the zoarium are strongly reminiscent of the freshwater genera 
Arachnotdea and Hislopia,® and indeed the relationship between 
1 Ann. Mag. Nat. Hist. (6), vol v, p. 23, pl iv tgs. 3, 3a (1890). 
2 Annandale, Rec. Ind. Mus., vol. vi, p. 198 (1911). 
