Arccllina.] iNFUSoiiiAL animalcules. 209 



fectly roimdcd cells, 5 — 6 iu l-2500tli; upcrtiu'e narrow, entire. 

 Length l-lOiOth. Found on moss. 



DiFFLUGiA ciliatu. — Lorica ovate, surface areolar ; each posterior 

 areola fiu-nislied with a eilium or cirrhus; constricted towards the fora- 

 meu which has 10 to 16 dcnticulations. Length 1 -936th. Common in 

 Hcrcynia. 



D. seminulum. — Lorica shorter, ovate, brown, surface mth narrow 

 and small ai'eolse, aperture wide, very finely denticulated or entii'e. 

 Length l-2500th to l-1250th. On moss and stones. 



D. colJaris. — Lorica formed like a neck behind the aperture ; 

 straight, attenuate, pyriform or sub-clavate ; smlace irregularly 

 cellular, the cells small, but of equal size, except about the neck, 

 where they are smaller; aperture entire. Length 1 -840th. About 

 roots of trees. 



D. dryas. — Lorica ovate, with longitudinal linear rows of ovate 

 cells ; apertui-e entii-e, truncate. The size of cells decreases poste- 

 riorly. Length 1-11 70th. On roots of trees. 



D. oligodon. — Smooth, oblong, sub-cylindrical, apertiu-e with eight 

 strong dcnticulations. Length 1-lOOOth. This species and the two 

 following found in Kurdistan. 



D. reticulata. — Lorica ovate, surface broader, marked by a net- 

 work of minute cells ; apertiu-e simple, large. In its interior are 

 nvmierous particles like aggregated buds ; or the margin of the fora- 

 men may be furnished with dentations. Length 1 -880th. 



D. squamata. — Lorica ovate, Avith large loose areolae looking like 

 scales (squama) ; aperture with dcnticulations, truncate contracted. 

 Length 1- 1450th. 



The next species, is from Dujardin, those following from Sclum- 

 berger. [Annales des Sciences Nat. 2,mo. Series, vol- iii. 1845, 

 p. 254.) 



D. glohulosa. — Lorica brown, globular, or ovoid, smooth. Length 

 l-260th to l-105th. Found netir Paris. 



D. d&pressa.—LoviQ.ai diaphanous, ovoid, depressed, resistant; its 

 surface divided by slight fissures (lines) into numerous small and 

 irregular polygonal sections. Length 1 -220th. Apertui'c with au 

 uneven margin. Found in springs, Vosges. 



D. (jigaatm. — Lorica, greyish, brown, rough as if screwed with 



