884 



SYSTEMATIC HISTOEY OF THE INFUSORIA. 



A. veneta (K.). — Friistiiles minute, 

 elliptic-oblong-, with truncate ends ; 

 lateral view semielliptic. KB. p. 108, 

 t. 3. f. 25. Marine. Venice and Con- 

 stantinople. 



A. horealis (K.). — Frustules minute, 

 oblong-lanceolate, with acute or trun- 

 cate apices ; lateral view semilanceolate. 

 KB. p. 108, pi. 3. f. 18. Heligoland. 

 1-1200". 



A. Holienackeri (Rab.). — Frustules 

 minute, oblong or oblong-lanceolate, 

 with three longitudinal lines on each 

 side. Rab D. p. 31, pi. 9. f. 11. South 

 Persia. 



A. hyalina (K.). — Frustules hyaline, 

 elliptic-lanceolate, with acute or trun- 

 cate apices, and a few, very delicate 

 longitudinal lines ; transverse strise ob- 

 scm-e. KB. p. 108, pi. 30. f. 18; SBD. 

 i. p. 19, pi. 2. f. 28. Marine. Europe, 

 (vii. 58.) Imperfectly silicious. 1-600" 

 to 1-422". 



A. nana (Greg.). — Frustules small, 

 narrow elliptic-oblong, with rounded 

 ends ; outer portions with straight ven- 

 tral margin, and about 50 transverse 

 strife in -001". GDC. p. 38, pi. 4. f. 64. 

 Scotland. 



A. elUptica (Ag., K.). — Frustules 

 small, elliptic-lanceolate, turgid at the 

 middle, with attenuated obtuse apices ; 

 valves distinctlv striated. KB. p. 108, 

 t. 5. f. 31. = CijmheUa elUptica, AD. p. 8. 

 Marine. Baltic. Associated in amor- 

 phous mucus, K. 



A. navicidaris (E.). — Frustules ellip- 

 tic-lanceolate, with subacute ends and 

 conspicuous transverse striae. EA. p. 122, 

 t. 1. 1. f. 12. Africa, America, (xii. 37.) 



A. gracilis (E.). — Frustules small, nar- 

 row oblong, truncate; valves slender, 

 transversely striated. EA. t. 3. 1. f. 43 ; 

 EM. t. 37. 3. f. 1. Europe, Asia, Africa, 

 America, Australia, (xii. 26.) Outer 

 portion of valve lunate. 



A. affinis (K,). — Frustules oblong, 

 slightly attenuated, with rounded or 

 broadly truncate apices, marked with 

 longitudinal lines, the central ones very 

 faint. KB. p. 107, t. 30. f. m. France, 

 Britain. 1-960" to 1-390". 



A. marina (S,). — Frustules elliptic, 

 with somewhat trimcate extremities; 

 nodule very faint; striae 40 in -001". 

 ANH. 1857, xix. p. 7, pi. 1. f. 2. Marine. 

 France, Britain. -0006" to -0024'. 

 (vii. 59.) Not unfrequent, but has been 

 overlooked from its exact resemblance in 

 outline to A. affinis ; it may be known 

 by its more delicate striae and inconspi- 

 cuous nodules, Sm. 



A. duhia (Greg.). — Frustules oblong, 

 with broadly rounded ends ; outer por- 

 tions stout, with concave venter, obtuse 

 ends, and 24 fine transverse striae in 

 •001". GDC. p. 42, pi. 5. f. 76. Scot- 

 land. It has some analogy with A. 

 inarina ; but the striation is coarser, and 

 nodides distinct, Greg. 



A. ohlonga (Greg.). — Frustides elon- 

 gated linear-oblong or elliptic-oblong, 

 with conic apices ; outer portions very 

 narrow, canoe-shaped, with conspicuous 

 nodule, and 24 distinct transverse striae 

 in -001". GDC. p. 43, pi. 5. f. 78. 

 Scotland. Large. 



A. elongata (Greg.). — Frustules elon- 

 gated, narrow, oblong-lanceolate, trun- 

 cate ; outer portions very narrow, canoe- 

 shaped, wath 26 conspicuous transverse 

 striae in -001"; dorsum with longitudinal 

 lines. GDC. p. 49, pi. 5. f. 84. Scotland. 

 Large. 



A. angusta (Greg.). — Frustules nar- 

 row linear-oblong, truncate; outer por- 

 tions with 44 fine transverse striae in 

 •001". GDC. p. 38, pi. 4. f. 66. Scot- 

 land. 



A. obtusa (Greg.). — Frustules broad 

 linear-oblong, with broadly rounded 

 ends ; outer portions canoe-shaped, with 

 70 verv fine transverse striae in -001". 

 Greg. TM. v. pi. 1. f. 34. Scotland. 

 Large. 



A.plicata (Greg.). — Frustules hyaline, 

 broad linear-oblong, with rounded an- 

 gles and truncate apices ; outer portion 

 canoe-shaped, very faintly striated; 

 dorsmn with longitudinal lines. Greg. 

 TM. V. pl.^ 1. f. 31. Scotland. Large. 

 The longitudinal lines give a plicate 

 appearance to the frustule, Greg. 



A. crassa (Greg.). — Frustules linear 

 or linear-oblong, with roimded or sub- 

 truncate apices; outer portions canoe- 

 shaped, with from 12 to 20 coarse trans- 

 verse striae in -001"; dorsmn with longi- 

 tudinal series of transverse striae. GDC. 

 p. 52, pi. 6. f. 94. =A. sulcata, Ro. MJ. 

 vi. p. 18, pi. 3. f. 7 ?. Britain. Large. 



A. spectabilis (Greg.). — Frustules 

 broad linear or linear-oblong, with 

 rounded angles and subtruncate apices ; 

 outer portions canoe-shaped, with 14 to 

 16 distinct transverse striae in -001"; 

 dorsum with longitudinal series of trans- 

 verse stria?. GDC. p. 44, pi. 5. f. 80. 

 Scotland, (vii. 57.) Large. 



A. excisa (Greg.). — Frustules h^^aline, 

 broadly linear or linear-oblong, truncate ; 

 appearing notched at the sides from the 

 marginal position of the nodides; outer 

 portion canoe-shaped, with 52 very fine 



