British Protozoa and Zoophytes. 123 



with delicate short fibres instead of the usual molecular matter, 

 and contains, both within the shell and tubes, the highly refrac- 

 tive bodies I have mentioned in a former paper as ova. 



EXPLANATION OF PLATE IV. 



Fig. 4. Dendrophrya erecta, seated on a portion of stone, and showing 

 pseudopodia projecting from summits of branches. 



Fiy. 5. Summit of one of the tubes of D. erecta, with projecting lobes of 

 sarcode and pseudopodia. 



On Lecythia elegans (nov. gen. et sp.).* 



This animal, of which I give drawings in PI. V. fig. 10, is 

 found on Sertularia pumila. It is exceedingly minute, and re- 

 quires high microscopic power and careful adjustment of light 

 for its accurate definition. The body is flask- or carafe-shaped, 

 mounted on a long, fine, rigid pedicle, and enclosed in a closely 

 fitting envelope. The summit of the body is dilated, and fur- 

 nished with a variable number of long, slender, divergent pro- 

 cesses or tentacles, which appear to correspond with those of 

 Aclinophrys. When the tentacles are contracted, they become 

 capitate, and assume the form of a bossed crown, as shown in 

 the figure. 



In the following part of this paper the term 'polypidom ' is 

 used (with Johnston) to signify the chitinous envelope of zoo- 

 phytes ; the term 'polypary,' the living communicating substance 

 from which the polyps spring — the ' ccenosarc ' of Allman ; the 

 term 'generative sac,' the cavity, formed of the two constituent 

 membranes of the zoophyte, which contains the ' generative ele- 

 ments' — ova or spermatozoa; and 'placenta,' the layer of f endo- 

 derm ' in the generative sac, from which the generative elements 

 are developed, and by which they are nourished. 



Cionistes reticulata (nov. gen. et sp.)f. 



Polypidom retiform ; alimentary polyps sessile, minute, white, 



with a single row of short tentacles ; reproductive polyps 



columnar, thickened towards the apex, not terminated by a 



cluster of thread-cells, bearing many generative capsules. 



A male specimen of this zoophyte was found growing on an 



old shell at Granton, in May 1857. It differs from the Euden- 



drium confertum of Alder (the Dicoryne of Allman) in the absence 



of the dense clusters of large thread-cells which terminate the 



* Read to the Royal Physical Society of Edinburgh, April 24, 1861 . 

 t Read to the Royal Physical Society of Edinburgh, March 23, 1859 ; 

 now rewritten. 



