128 THE EOTIFEKA. 



Genus ERETMIA, Gosse. 



[GEN. CH. Lorica neither tessclated nor ridged ; destitute of spines irropcr, but 

 furnished with long dltenuatc rigid bristles. 



This seems to be a natural group, containing numerous species. They appear to be 

 destitute of the spines common to Anurcsa, pointed extensions of the lorica itself; for 

 the slender appendages are quite different in form, and probably in function. — P.H.G.] 



E. PENTATHEix, Gossc, sp. nov. 

 (PI. XXIX. fig. 12.) 



[SP. CH. Five long bristles iwojected from the lorica ; one dorsal and two from each 

 side: no frontal or posterior spines. 



This species I know only from a single dead and empty lorica which I found in the 

 sediment of water, dipped in June, from a pool at Sandhurst, Berks, by Dr. Collins. 

 The lorica is ovate, truncate in front, with no spines of the ordinary pattern, but bearing 

 attached to the medial line of the dorsum a long stiff seta, or attenuate spine, the base 

 of which is deep but very thin, the depth gradually diminishing. From the sides, about 

 two-thirds down, spring a pair of similar bristles of less basal depth ; and, at a short 

 distance from the round extremity of the lorica, another pair. All radiate from the 

 surface of the lorica, and are consimilar in length and tenuity. No trace of the internal 

 organs was left. 



This has evident affinities with the A. biremis of Ehrenberg, which he describes 

 from a single specimen obtained in the Baltic Sea. That species, however, has four 

 frontal spines. — P.H.G.] 



Length, unrecorded. Habitat. Pool near Sandliurst Mil. Coll. (P.H.G.) : very rare. 



E. cuBEDTES, Gosse, sp. nov. 

 (PI. XXIX. fig. 11.) 



[SP. CH. Lorica bag-like, round behind, truncate before; with a diverging seta 

 from the dorsum and one from the venter ; four straight spinous processes from the 

 rounded end ; the whole surface cut into cubical tessera. 



This minute and very curious form I place in the genus Eretmia, though the body 

 processes seem rather spines than set*. I have found it, but only as a dead lorica, on 

 two separate occasions, and in water from widely distant localities ; but Mr. Hood has 

 since found it living, and sent me a good drawing of it, which well agrees with my own. 

 All were in autumn and winter of 1885-86. 



The lorica edge is not spined, but notched. Yet the notches are but the intervals 

 between the tesscrm of the front row, of which three are seen beside the lateral two. 

 For the entire surface of the lorica is marked with two series of depressions, those of 

 each series parallel to each other, but the two series crossing each other at right angles 

 (or nearly) ; so as to leave a multitude of square tesserae, or cubical knobs, — like dice 

 set corner- wise : — a form of surface quite unique, so far as I know. I was, indeed, dis- 

 posed to think it an Arcelline Infusory of the genus Difflugium, till I received Mr. Hood's 

 report, which showed it a true Anuraad. He describes the rotatory front as bearing 

 the normal three great ciliate lobes. The large red eye I had myself seen. — P.H.G.] 



Length (including spines), ^jj, inch (P.H.G.) ; ^L inch (Hood). Habitat. Birming- 

 ham (P.H.G.) ; Black Loch, Dundee (Hood) : rare. 



