796 



SYSTEMATIC HISTORY OF THE INFUSORIA. 



splendida, and its alse are less conspi- 

 cuous; but it resembles that species in 

 form, and we doubt whether it be 

 distinct. 



S. striatula (Tui-p.). — Front view broad 

 cuneate, with rounded angles and short 

 costae ; lateral view ovate, with distant, 

 curved costse, which reach the median 

 line; al« small. SBD. i. pi. 9. f. 64 

 Common. Resembles aS". splendida, but 

 is shorter in proportion to its breadth. 

 In the front view the central portion is 

 broader, the ends more truncate, the 

 costse shorter, and the alse less conspi- 

 cuous. Lateral view faintly striated; 

 stri£e 8 to 13 in 1-1200". ( ->% . /»; iW 



S. limosa (Bai. MS. ?).— Broadly ovate 

 acuminate, faintly punctato-striate ; ca- 

 naliculi short and indistinct, not reach- 

 ing more than 1-6" across the valve ; 

 length -0073", breadth -0035" ; striae in- 

 distinct, 22 in -001. New Zealand, Hud- 

 son River, New York, Thames mud. 

 Bri JMS. vii. p. 179, pi. 9. f. 5. 



S. h'ems (E.). — Short ; form and size 

 of S. striatula, but with 16 finer striae in 

 1-1200". ERBA. 1844, p. 272 ; KSA. 

 p. 39. Kiu'distan. 1-912". 



S. Testudo (E.). — Large, ovate, obtuse, 

 with 12 slender striae in its length, which 

 is 1-288". E l.c. 1840, p. 24; KSA. 

 p. 39. Marine. 



S. Gemma (E.). — Front view narrow 

 cuneate ; lateral view broader, ovate- 

 elliptic, faintly striated between the de- 

 licate, unequally distant costae, which 

 reach the median line; alae inconspi- 

 cuous. KB. t. 7. f. 9; SBD. i. pi. 9. f. 65. 

 Common in marine marshes, (xii. 2-4.) 

 Distinguished from aS". striatula by its 

 much finer costae and less conspicuous 

 alae, which in the lateral view generally 

 coincide with the margins. Sometimes 

 nearly elliptic. We have rarely seen it 

 so narrow as Professor Smith's figure 

 represents it. 



S. kevigata (E.). — Elongated, smooth, 

 with subequal, obtuse ends, a distinct 

 median suture, and two longitudinal 

 lateral lines. KSA. p. 36 ; EM. t. 33. 14. 

 f. 24. Fossil. United States. 1-168". 

 Ehrenberg's figure in the ' Microgeologie ' 

 is ovate, with a median line, lax intra- 

 marginal crenations, and very short 



S. buatimalemis, EM. pi. 33. 6. f. 7. 

 America. Figure broadly ovate, with 

 both ends much rounded, and minute 

 intramarginal crenations, without me- 

 dian line or costae. 



S. ichthyocephala (Rab.). — Large, 

 ovate-oblong, with rounded ends, three 



broad, flexuose costae in 1-1200" and a 

 broad linear median band. Rab D. p. 30, 

 pi. 10, Supp. f 6. Italy. The figure 

 shows the costae cm*ved, except the 

 middle one, which is broader and 

 straight. 



S. cordata (E.). — Ovate-subcordate, 

 with four lax striae in 1-1152", conti- 

 guous in the median line. ERBA. 1845, 

 p. 272 ; KSA. p. 39. Fossil. Georgia. 



S. prcetexta (E.). — Long ovate, more 

 than twice as long as broad, with five 

 rather lax striaa in 1-1252", towards the 

 middle broadly interrupted and not con- 

 tiguous in the median line, hence forai- 

 ing four series Avitli a broad linear me- 

 dian space and two smooth lateral ones. 

 Maritime. India. ERBA. 1845, p. 365 ; 

 KSA. p. 38. 



S. euglypta(F..). — Small, ovate-oblong, 

 mth seven striae in 1-1200", which do 

 not reach the centre ; front view cuneate, 

 with rounded angles at larger end. EA. 

 p. 136, t. 3. 5. f. 2. 4; KB. t. 28. f. 27. 

 Asia, Africa, America. 



S. uninervis (E.). — Small, ovate, half 

 as long again as broad; costae reticu- 

 lated at the margin, contiguous at the 

 slender median line, 7 in 1-1152". KSA. 

 p. 38. Maritime. India, Africa. 



S. Folium (E.). — Ovate, turgid and 

 obtuse, slightly compressed, with 24 fine 

 striae in 1-1150". Fossil. Barbadoes. 

 1-540". 



S. Crumena (Breb.). — Small, orbicidar 

 ovate, with 7 or 8 evident marginal 

 stri» in 1-1200". KSA. p. 38. Aquatic. 

 France, Britain. Its suborbicidar form 

 in lateral view distinguishes it from 

 every other species except S. Bright- 

 ivellii. 



S. Brightwellii (S.). — Small, suborbi- 

 cular, with one end subacute ; costae 

 distinct, marginal, 10 in -001"; alae in- 

 conspicuous. SBD. i. p. 33, pi. 9. f. 69. 

 Britain. According to Professor Smith, 

 this species is distinguished from S. Cru- 

 mena by its coarser and more prominent 

 costae and distinct striae ; S. Crumena is 

 also smaller and more orbicidar. 



S. oralis (Breb.). — Small, ovate-elliptic, 

 with 8 marginal costae in 1-1200", and 

 one end more attenuated than the other ; 

 alae inconspicuous. KSA. p. 33 ; SBD. 

 pi. 9. f. 68. Aquatic. France, Britain. 

 Front view oblong-cimeate, truncate. 

 1-360" to 1-280". Margin with very 

 short, teeth-like costae. The larger end 

 in lateral view is less rounded than in 

 the allied species. 



S. orata (K.j. — Minute ovate, or ovate- 

 elliptic, with 7 to 9 delicate, very short, 



