OF THE AECELLINA. 



553 



of Lagynida, as well as the interesting Cornus^pira described by Scliultze. Of 

 Fissurina we have no details. 



Dr. Bailey, of New York, adds another new genus to the Monothalamia, 

 under the name of Caclium. 



Genus DIFFLUGIA. — Shell of one chamber (unilocular) with a single 

 aperture, usually of a more or less spherical or ovoid shape, but sometimes 

 more elongated and clavate, or pitcher-shaped; thin, opaque, of a dark 

 olive or brown colour, in general, when occupied by the hving organism, but 

 when empty, hyahne and colomiess. The sui-face of the shell is either smooth 

 or sculptured, and occasionally armed with spine-like processes. In a few 

 species, D. proteiformis, D. acuminata, and D. gigantea, the envelope does 

 not acquire even the usual homy consistence, but is soft, and becomes 

 strengthened by the adhesion of foreign particles of silex and other matters, 

 which give it a rough, irregular appearance. The aperture or foramen 

 varies in figure and size, and furnishes valuable specific distinctions. The 

 pseudopodes are characterized as being cylindrical, not much elongated, and 

 obtuse or rounded at the extremities. 



DiTTLUGiA proteiformis. — Ovate, sub- 

 globose, covered by a coating of minute 

 grains of sand, and either of a deep olive, 

 black, or greenish colour. Processes 

 hyaline, from 1 to 10. 1-240". Among 

 Oscillatoriae. 



D. ohlonga. — Oblong, ovate, or orbi- 

 cular, smooth, and of a brownish colour ; 

 processes fewer and stouter than those 

 of the preceding species. Among Oscil- 

 latoriae, &c. 1-200". Surface irregu- 

 larly reticulated. 



J), acuminata. — Oblong and rough, 

 w-ith minute grains of sand ; posteriorly 

 pouited ; processes hyaline. 1-70". 



D, Enchelijs (xxi. 19 «,/). — Oval ; co- 

 lomiess ; translucent and smooth, round- 

 ed dorsallv; processes transparent, 

 slender and small ; apertiu-e lateral. This 

 is the smallest species of the genus. 

 1-30'" 1-15"'. In stagnant water. Du- 

 jardin refers it to his genus Trinema. 



D. Ampulla. — Oblong, club-shaped, ele- 

 gantly marked by an oblique series of 

 dots (puncta) ; hyaline ; foramen ovate. 

 1-680". At Salzburg. 



D. spiralis (Bailey). — Sub-globose, mi- 

 nutely granidated : upper sm-face un- 

 equal, with a spiral line of two or three 

 tmns. Variable processes niunerous, 

 constantlv changini? position, hvaline. 

 1-680". ^ Berlin and United States. 

 Fresenius remarks that some large spe- 

 cimens are met with coated \%dth coarse 

 particles, like D. proteiformis, instead 

 of the usual finely reticulate lines. It 

 attains, he says, in size to 1-7"'. 



D. acantliophora (xii. 64). — Ovate, 

 oblong, loosely areolated ; foramen den- 

 tated; armed posteriorly with three or 

 fo\u spines (aculei). 



D. areolata. — Lorica and foramen as 

 in the preceding, but the spines defi- 

 cient. 



D. dentieulata. — Ovate, oblong, smooth ; 

 foramen with twelve dentations. 



D. Lagena. — Clavate, or oftheformof 

 a bottle ; smooth, without reticulations ; 

 margin of opening entire. 



D. Icevigata. — Ovate, oblong, smooth ; 

 foramen with eight dentations ; ap- 

 proaches D. dentieulata. 



1). striolata. — Ovate, oblong, delicately 

 striated longitudinally j foramen with a 

 dentated border. 



D. Bructeri. — Ovate, surface rugose ; 

 the end presenting the aperture rather 

 attenuate but tmneate ; margin of aper- 

 ture entire. 1-1050". On moss. 



D. cancellata. — Oblong, obtuse ; sur- 

 face beset with imperfectly rounded cells, 

 5 to 6 in 1-2500" ; aperture narrow, en- 

 tire. 1-1040". On moss. 



D. ciliata. — Ovate, surface areolar ; 

 each posterior areola furnished with a 

 cilium or cirrhus ; constricted towards 

 the foramen, which has 10 to 16 denti- 

 culations. 1-936''. Conmiou in Her- 

 cynia. 



D. seinimdum. — Shorter, ovate, brown, 

 surface with narrow and small areolae ; 

 aperture wide, verv' finely denticidated 

 or entire. 1-2500" "to 1-1250". On moss 

 and stones. 



D. collaris. — Narrowed like a neck be- 

 hind the aperture ; straight, attenuate, 

 pyriform or sub-clavate ; surface irregu- 

 larly ceUular; cells small, but of equal 

 size, except about the neck, where they 

 are smaller; apertiu-e entire. 1-840". 

 About roots of trees. 



