135 
cumulated animal, rather than that of a zoophyte, though 
I have not succeeded in detecting it. 
LIMNIADES. 
Polypidoms fleshy, or spongy, or corneous, polymorphous ; 
'he polypes placed in tubes with angular or round orifices, 
closed when the animals recede. 
FRE DERI CELL A. 
Generic Character : Polypidom fixed, coriaceous, tubular, 
branched. Polypes issuing from the extremities of the 
branches; tentacular disc orbicular, tentacula arranged on 
the margin of the disc in a single series, about twenty 
four in number, invested at their origin by a membrane. 
Dr. Allman, Ann. and Mag. Nat. Hist., vol. 13, p. 331. 
PREDERICELLA SULTANA. Horny, trailing, sparingly 
branched ; branches tubular, closed at their terminations 
when the polype is withdrawn. 
Plumatella sultana, Johnston’s Brit. Zooph., p. 323. 
Sab. On the weeds in the ponds at Trengwainton, near 
Renzance; common. 
This species till very lately, was arranged with Plumatella, 
but that genus is now divided into two, Plumatella, and 
Fredericella by Allman and others. 
It is horny, tubular, creeping, and rarely exceeds an inch 
>n length. The branches are few in number, short and 
s °uielimes dichotomously dividing. When the animal is 
"'thdrawn, the openings of the lubes are closed. When 
fl'e animal protrudes itself, the openings become patulous. 
File tentacula are about thirty, long, slender, though not of 
e qual length, and ciliated. The inferior third of tentacula 
ar *d external surface of the mouth cloated with long cilia 
"'hich point towards the termination of tentacula, these do 
hot move in a vibratory manner, but are sometimes closely 
a Pplied to the surface and at others hang loosely. The 
Sizzard and intestine very visible. 
