878 Proceedings of the Boyal Physical Society. 



V. Observations on British Zoophytes and Protozoa. 1. Clava nodosa. 

 2. Acharadria larynx. 3. Zooteirea religata. 4. Freya (Lagotia) 

 obstetrica, Freya stylifer. 5. Chaetospira maritima, 6. Oxytricha 

 longicaudata. By T. Strethill Wright, M.D. (Plate XVII.) 



1. Clava nodosa (n. sp., T. S. W.) 



" Polypary creeping. Scleroderm membranous, 1 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 C. repens } for which it may be mistaken, is found in 

 shallow rock pools. 



2. Acharadria larynx. (PI. XVII. 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 Caryophyllia Smithii, received from 

 Ilfracombe. This little Tubularian was about a quarter of 

 an inch high, with three polyps, and resembled in habit 

 Tubularia larynx. It bears the same relation to Vorticlava 

 that Corymorpha does to Tubularia 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. XYIIL), 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 



