OF THE NAVICULE^. 



909 



parallel stiia3, wliicli reach the median 

 line, and a small central nodule. 



N. acuminata (S.). — Linear, with 

 acutely cuneate ends and parallel costae^ 

 which do not reach the median line. = 

 Pinmdaria acuminata, SD. i. p. 55, pi. 18. 

 f. 1G4. Prenmay peat. 



N. minor (Greg.). — Minute ; lateral 

 view linear, with acutely cuneate ends ; 

 strias fine, nearly parallel, not reaching 

 the median line,\36 to 40 in -001". GDC, 

 p. 5, pi. 1. f. 1. Scotland. 



N. crassa (Greg.). — Linear- or elliptic- 

 oblong, with obtusely cuneate ends ; 

 strice tine, but distinct, moniliform, radi- 

 ant, nearly reaching the median line, but 

 leaving an orbicular blank space round 

 the central nodule. MJ. iii. p. 41, pi. 4. 

 f. 18. Scotland. Is of a brown colom- 

 in balsam. 



N. Utricuhis (E., K.). — Striated, 

 linear-oblong ; ends attenuated, with a 

 slight marginal curvature, into the obtuse 

 apices. KB. p. 9S. = Pinnularia Utri- 

 culus, EA. p. 134. Mexico. Alnn to 

 iV^. disphenia. 



N. trigonocephala (E.). — Striated, 

 linear, with the ends dilated into large 

 cuneate heads. = Pinnularia trigonoce- 

 phala, EM. pi. 34. 8. f. 11.^ Japan. Very 

 unlike any other species in having the 

 cuneate heads much dilated and broader 

 than the intermediate portion. 



N. microstoma (K.). — Large, turgid, 

 elongated oblong, vdtii obtusely cimeate 

 ends, longitudinal lines, and a veiy mi- 

 nute oblong median nodule ; striae nume- 

 rous, obscure. KA. p. 71. =iV. lata, KB. 

 p. 92, pi. 3. f. 51; N.Jirma,^ SD. p. 48, 

 pi. 16. £. 138. Europe. Front view broadly 

 linear, with truncate ends, roimded an- 

 gles, and broad lateral borders, tm'gid at 

 the middle. Perhaps Professor Smith 

 was right in imiting this to N.Jirma. 



'N.Jirma (K.). — Large, tm^gid, oblong- 

 lanceolate, with obtuse, cuneate ends, 

 thick borders, and largo median nodule ; 

 striae wanting or obscure. KB. p. 92, 

 pi. 21. f. 10. Fossil. Santa Fiore. 



N. maxima (Greg.). — Large, striated, 

 linear, with longitudinal lines, and ob- 

 tuse, cuneate or conic ends ; striae fine, 

 parallel, nearly reaching the median line, 

 shorter opposite the central nodule, 

 about 52 in -001". GDC. p. 15, pi. 1. 

 f. 18. Marine. Britain. (vii. 75.) 

 Generally elongated ; nodule definite, 

 surrounded by a smooth space. Front 

 view linear, naiTowest at the middle, 

 with striated margins. Differs from N. 

 jirma in its paler colom', finer striae, and 

 more obtuse apices, Greg. 



^.formosa (Greg.).— Large, striated, 

 linear or linear-oblong, with longitudinal 

 lines, obtuse, cuneate or conic ends ; 

 striae distinct, slightly inclined, not 

 reaching the median line, shorter oppo- 

 site the large central nodule, about 35 

 in -001". TM. iv. p. 42, pi. 5. f. 6. 

 Marine. Scotland. Agrees in form with 

 H. maxima, but is distinguished by its 

 more conspicuous and slightly inclined 

 striae which do not reach the median 

 line, leaving a longitudinal median blank 

 band. 



N. Kerguelensis (R.). — Oblong, with 

 obtusely cuneate ends ; costae stout, 

 radiant ; nodule indefinite. = Pinnularia 

 Kerguelensis,YM.^l. 35 a. 2. f. 15. Afiica. 



I. Valves elliptic, with rounded ends. 



N. cocconeoides (Rdh.). — Small, ellip- 

 tic, with broadly romided ends, and 11 

 to 13 parallel and distinct, but faint 

 strict in 1-1200", which reach the median 

 line. = Pinnularia cocconeoides, Kab D. 

 p. 43, pi. 6. f 18. Stockholm. 



^ N. scutelloides (S.). — Small, subor- 

 bicular, with 18 monilifomi, radiant 

 striae in -001", nearly reaching the 

 median line. SD. ii. p. 91 ; Greg. MJ. iv. 

 pi. 1. f. 15. Britain. 



_N. pectincdis (Breb.). — Linear-elliptic, 

 Tvith roimded ends, and 22 striae in -001". 

 SD. ii. J). 92. Marine. France, Britain. 

 Front view with truncate ends. 



N. Algeriensis (jNIont.). — Elliptic-ob- 

 long, with 10 striae on each margin. 

 M. Fl. d' Alger, p. 190. Marine. Algiers. 



N. Cluthensis (Greg.).— Elliptic, with 

 broadly rounded ends ; striae conspicu- 

 ous, moniliform, reaching the median 

 line, about 20 in -001"; median line 

 broadest at the central nodule, slightly 

 attenuated towards the ends. GDC. 

 p. 6, pi. 1. f. 2. Scotland, (vn. 73.) 



N. oralis (Nag.). — Finely striated, 

 oval elliptic j front view broadly linear. 

 1-720" to 1-600". KA. p. 890. Switzer- 

 land. 



N. oblongella (Nag.). — Smooth, ob- 

 long-oval ; front view broadly linear. 

 1-720 ' to 1-430". KA. p. 890. Switzer- 

 land. 



^ ^.fossilis, EM. pi. 10. 1. f. 6. Bohemia. 

 Ehrenberg's figure shows this species 

 elliptic, slightly rhomboid, with rounded 

 ends ; the median sutm-e of three lines, 

 interrupted by the indefinite central 

 nodule. 



N. nana (Greg. MS.). — Minute, oval, 

 obtuse.; costae radiant, nearly reaching 

 the median line; umbilical space not 



