378 
Froceedings of the Boyal Physical Society, 
V. Observations on British Zoophytes and Protozoa. 1. Clava nodosa. 
2. Acharadria larynx. 3. Zooteirea religata. 4. Freja (Lagotia) 
obstetrica, Freya stylifer. 5. Chsetospira maritima, 6. Oxytricha 
longicaudata. By T. Strethill Wright, M.D. (Plate XVII.) 
1. Clava nodosa (n. sp., T. S. W.) 
" Polypary creeping. Scleroderm membranous, ' Polyps 
single, small, aurora-coloured, each springing from a small 
knot of convoluted tubes/ This zoophyte was found on the 
fronds of Delesseria sanguinea at Queensferry and Largo." 
The very delicate threads of the polypary creep over the 
fronds of the seaweed, and at intervals twine themselves into 
a convoluted knot of membranous tubes, from which a single 
polyp arises. The species occurs only at low tide mark ; 
while G. repens, for which it may be mistaken, is found in 
shallow rock pools. 
2. Acharadria larynx. (PI. XYII. figs. 7, 8.) 
*' Polypary branched, spirally twisted. Polyps pale orange, 
with two rows of tentacles. The lower row from 4 to 12, the 
upper row from 2 to 8 capitate." 
On stones carrying Gary ophy Ilia Smithii, received from 
Ilfracombe. This little Tubularian was about a quarter of 
an inch high, with three polyps, and resembled in habit 
Tuhularia larynx. It bears the same relation to Yorticlava 
that Corymorpha does to Tuhularia larynx. 
3. Zooteirea religata. 
I described this animal to the Society about three years 
ago. It is a stalked Actinophrys. The body, as in other 
animals of this class, consists of two elemental tissues, 
to which I have given the term ectosarc and endosarc, 
— terms which have been adopted by Dr Carpenter. The 
ectosarc or external tissue is prolonged into a thick brush 
of the most delicate contractile palpocils or tentacles, like 
threads of spun glass (PI. XYIII.), by which the animal 
is constantly seizing small organic particles, and convey- 
ing them to the endosarc or inner tissue, which is the 
nutritive element. I stated that the stalk was formed of 
a prolongation of the ectoderm, similar to the tentacles; 
but, having again discovered large colonies of these animals 
last summer, and again this winter, I have been enabled to 
study the structure of the stalk more closely, and find that 
