92^ 



SYSTEMATIC HISTOEY OF THE INFUSORIA. 



•001". KB. p. 107 ; SD. i. p. 44, pi. 15. 

 f. 124. = Navicula and Entomoneis alata, 

 EB. 1845^ p. 154. Common, especially 

 in salt-water marshes, (xiii. 5 to 7.) 

 1-570" to 1-430" 5 central portion with 

 longitudinal lines. 



A. Kdtzingii (Breb.). — Very hyaline ; 

 front view slightly constricted, longi- 

 tudinally lined, with rounded apices. 

 KA. p. 93. France. 



A. constricta (E.). — Very hyaline ; 

 front view oblong, sinuato-constricted, 

 with rounded ends ; lateral view narrow, 

 with straight median line, and transverse 

 stauros-likeband. EA. p. 122, pi. 2. 6. f. 28 ; 

 SD.i.p.44,pl. 15. f 126. Europe, America. 

 (xii. 1.) Stride very faint, 68 in -001". 



A. duplex (Donkin). — Broad, panduri- 

 form, with truncate ends and rounded 

 angles; lateral view narrow, not stri- 

 ated ; keel strongly sigmoid, unaccom- 

 panied by puncta. TM. vi. p. 165, pi. 3. 

 f. 13. England. Resembles A. alata in 

 the broad, deeply-constricted front view 

 with conspicuous alee, but differs from it 

 in the absence of striae and puncta, and 

 in the narrow-linear lateral view. 



A.plicata (Greg.). — Front view deeply 

 constricted, with broadly roimded ends ; 

 each valve with a plate extending from 

 its inner margin to the nodule, fm^nished 

 like the wings with about 50 fine trans- 

 verse strise in -001" ; central portion 

 with faint vertical lines or folds. GDC. 

 p. 33, pi. 4. f. 57. Scotland. Approaches 

 nearest to A. alata, but differs from it in 

 the folds of the middle space, and in the 

 presence of lateral plates. Judging from 

 the figure quoted, the longitudinal lines 

 are similar to those present in A. alata 

 and other species, and we doubt the 

 distinction of the lateral plates. 



A. pulclira (Bailey). — Large ; front 

 view deeply constricted, with rounded 

 ends, distinctly striated, punctate near 

 the margin.^ BC. ii. p. 38, pi. 2. f 16 

 & 18. Florida. Often twisted ; central 

 portion narrow, sigmoid, with a few fine 

 longitudinal lines. 



A. quadrifasciata (Bailey). — Small; 

 front view moderately constricted, with 

 truncate or slightly rounded ends ; valves 

 striated, lanceolate, with produced ros- 

 tellate apices. BC. ii. p. 38, pi. 2. £ 2-4. 

 United States. When living, the colour- 

 ing matter forms four yellowish trans- 

 verse bands ; not contorted. 



A. vitrea (S.). — Straight ; front view 

 oblong, with rounded ends and slight 

 constriction ; lateral \Tiew lanceolate ; 

 striaj 52 in -001". SD. i. p. 44, pi. 31. 

 f. 270. Britain. 



^ A. elegajis (S.). — Straight ; front view 

 linear-oblong, with broadly rounded ends 

 and very slight notch-like constriction ; 

 lateral view lanceolate ; striae 40 in 

 •001". SD. ii. p. 90. ; GDC. p. 33, pi. 4. 

 f. 58. Britain. '^Distinguished from ^. 

 vitrea by its longer and comparatively 

 more lanceolate and slender frustule, 

 and closer striae" (S.). Professor Ai-nott 

 would unite this with A. vitrea. 



A. ohtusa (Greg.). — Front view linear- 

 oblong, with slightly sinuated sides and 

 rounded ends : striae veiy line. GDC. 

 p. 34, pi. 4. l 60. Scotland. Alee of 

 nearly uniform breadth. 



A. minor (Greg.). — Front view oblong, 

 with slightly sinuated sides and rounded 

 ends ; striae rather coarse ; central smooth 

 portion lanceolate. TM. v. p. 75, pi. 1. 

 f. 38. Scotland. 



A. pusilla (Greg.). — Front view qua- 

 drangular ; alae slightly constricted, the 

 constriction apparently overlapped by 

 the convexity of the valve ; lateral view 

 acutelv lanceolate ; striae fine, about 60 

 in -OOi". GDC. p. 33, pi. 4. f. 56. Scot- 

 land. 



A. lepidoptera (Greg.). — Elongated ; 

 front view linear, with broadly rounded 

 ends ; the notch-like constriction of the 

 alas apparently overlapped by the con- 

 vexity of the valve ; lateral view lan- 

 ceolate, apicidate ; striae fine, about 48 

 in -001" ; GDC. p. 33, pi. 4. f. 69. Scot- 

 land. The alae are carried round the 

 ends, and in the lateral \dew appear like 

 an apiculus. 



A. maxima (Greg.). — Front view very 

 broad, panduriform, with rounded ends, 

 the notch-like constriction overlapped 

 by the convexity of the valve ; striae 

 distinct, about 36 in -001" ; lateral view 

 acutely lanceolate. GDC. p. 35, pi. 4. 

 f. 61. Scotland. 



A. complexa (Greg.). — Front view 

 broadly pandimform, with broadly romid- 

 ed ends; alae with marginal pimcta ; striae 

 delicate, about 45 in -001" ; central por- 

 tion oblong, with concentric longitudinal 

 lines. GDC. p. 36, pi. 4. f 62. Scot- 

 land. 



A.paludosa (S.). — T\^dsted; front view 

 dilated, broadly winged, deeplj- con- 

 stricted, with rounded or truncate ends, 

 and a waved longitudinal line on each 

 side between the margin and central 

 portion ; sti-ic^ 60 in -001" SD. i. p. 44, 

 pi. 31. f 269. Britain. Fresh or slightly 

 brackish water, according to Smith; 

 marine, according to Professor Arnott. 



A. ornata (Bailey). — Small; front view 

 deeply constricted, with truncated or 



