868 



SYSTEMATIC HISTOKY OF THE INFUSORIA. 



transverse striae : Saxony, y. minor (K.). 

 In tliis species the strise are visible only 

 when highly magnified. It is best di- 

 stinguished by its slightly angular or 

 rhomboid form — a character not noticed 

 by Ehrenberg, who gives in the ' Micro- 

 geologie ' only one figure, and five habi- 

 tats. Diam. 1-2200" to 1-960". 



C. depressa (K.). — Minute, much de- 

 pressed, plane, elliptic, furnished near 

 the margin with pimctated striae. KB. 

 pi. 5. f. 8. 2. Aquatic. Eiu'ope. Accord- 

 ing to Rabenhorst, it resembles a small 

 and flat state of the var. salina of the 

 preceding species. Diam. 1-1800". 



C. Placentula (E.), — Plane, elliptic, 

 \\\\h. faint, dotted longitudinal lines. 

 SBD. i. p. 21, pi. 3. f. 32. (\^i. 36.) 

 Aquatic. Common. 1-1440". Ehren- 

 berg, in his ' Microgeolo^ie,' gives many 

 figm-es and upwards of sixty habitats for 

 this species. His definition differs from 

 that of Professor Smith, and is as fol- 

 lows : — " Plane, elliptic, with an abrupt 

 margin; within and without smooth." 

 Having seen no authentic specimens of 

 C. Placentula and C. Pedicidus, we have 

 adopted Professor Smith's views, but do 

 not implicitly rely on them ; for not only 

 do Ehrenberg and Smith differ in their 

 descriptions, but whilst the latter states 

 that both species occm- in the Lough 

 Moume deposit, the former has excluded 

 them from his lists of species found 

 in it. 



C.prcetexta (E.). — Small, elliptic, with 

 six longitudinal lines on each side of the 

 centre, and a dilated, smooth, areolar 

 margin. EA. pi. 3. 3. f. 11. Japan, 

 India, Africa, America. 



C.pimctata (E.). — Small, elliptic, with 

 eight punctated longitudinal lines on 

 each side of the median line. KB. p. 72, 

 pi. 29. f. 30. Australia, America. 



C. eughjpta, EM. pi. 34. 6 a. f. 2. Flo- 

 rida. Ehrenberg' s figure represents a 

 smaU elliptic form, with broadly rounded 

 ends, and a median line and nodule, 

 having on each side parallel, distinctly 

 dotted longitudinal lines. 



C. striolata (Rab.). — Small, narrow- 

 elliptic, with dense, faint longitudinal 

 striae on each side of the median line. 

 Rab D. p. 28, pi. 10. f. 8. Aquatic. 

 Salzburg. 



C. ohlonga (K.). — Oblong-eUiptic, with 

 somewhat acute apices and longitudinal 

 lines. KB. p. 72, pi. 5. 8. f. 7. North 

 Sea and Indian Ocean. 1-320". 



C. limhata (E.). — Large, elliptic, with 

 broadly rounded ends, very fine longi- 

 tudinal lines, and a subentire gelatinous 



border. EM. pi. 14. f. 42. Adriatic and 

 Mediterranean Seas, 1-576". Raben- 

 horst describes this species as like C. 

 Placentida with a distinctly developed 

 border-like membrane. 



C. oceanica (E.). — Large, roimdish- 

 elliptic, with numerous delicately punc- 

 tated, somewhat converging longitudi- 

 nal lines ; dorsmn convex. KSA. p. 52. 

 Europe, America, (xu. 42.) 



C. concentrica (E.). — Large, broadly 

 elliptic, with broadly rounded ends and 

 concentric longitudinal lines. KB. p. 72, 

 pi. 28. f. 15. Mexico. 



C. undulata (E.). — Elliptic ; dorsum 

 slightly convex ; exterior furrowed, with 

 undulated concentric lines. KB. p. 72, 

 pi. 5. f. 11. Baltic, Asia, Afi-ica. 1-432". 

 Not transversely striated. 



C. lineata, EM. numerous figures and 

 habitats. Australia, Asia, Africa, Eu- 

 rope. We have seen no description of 

 this species ; but, according to Ehren- 

 berg's figures, it seems to differ from C. 

 undulata in the nonconvergence of its 

 longitudinal striae. Apparently a very 

 common species, as Ehrenberg gives 

 upwards of fifty habitats. 



C. fasciata (E.). — Large, elliptic ; disc 

 with dotted longitudinal lines on each 

 side the median line, intersected by a 

 transverse median smooth band. £B. 

 p. 72, pi. 28. f. 14. Aquatic. Peru. 



C. gemmata, EM. pi. 37. 2. f. 1. Ore- 

 gon, vEgina. Ehrenberg's figm-e is large, 

 broadly elliptic, wdth rounded ends and 

 a smooth linear median line, having 

 on each side five or six parallel, lon- 

 gitudinal, moniliform series of large 

 gTanules. 



C. aggregata (K.). — Oblong-eUiptic, 

 girt with a broadish lacerated, crenidate 

 limb ; disc having near the margin finely 

 dotted rays, and in the middle punc- 

 tated longitudinal lines. IvB. p. 72, 

 pi. 5. 8. f. 5. Baltic and North Seas. 

 1-1440". 



C. marginata (K.). — Elliptic, wath 

 radiatingly pimctated margin and dis- 

 coid longitudinal lines. KB. p. 72, pi. 5. 

 6. f. 1. Marine. Europe. 1-840". 



C. dirupta (Greg.). — Broadly elliptic 

 or suborbicular, wjth a smooth median 

 line, having on each side wavy longi- 

 tudinal and faint transverse striae. GDC. 

 p. 19, pi. 1. f. 25. Scotland. The lon- 

 gitudinal striae are most evident in the 

 centre, and the transverse, which are 

 somewhat radiant, near the margin. 

 LTnder a low power the nodule appears 

 dilated into a stauros. Professor Gregory 

 states that it differs in its brown colour 



