OF THE NAYICULE.i:. 



899 



side by a longitudinal line into two series, 

 reaching the median line. = iV! Smithii, 

 y nitescem, GD. p. 15, pi. 1. f. 16. Ma- 

 rine. Scotland. Colourless imder a low 

 power; median line linear, nodide de- 

 finite. Distinguished from N. Smithii by- 

 its smaller size, the characters of nodide 

 and median line, and its bright- white 

 aspect, 



N. quach'ifasciata (E.). — Elliptic-ob- 

 long, Avith attenuated, obtuse ends ) 

 strise 20 in 1-1200", di\'ided on each side 

 of the median line into two linear series. 

 EB. 1840. = Pinnularia quadrifasciata, 

 EM. pi. 19. f. 25-27; N. lineata,^J)on\im, 

 MT. vi. p. 32, pi. 3. f. 17 ? Marine. Fossil, 

 Greece ; recent, Britain. 1-430". Series 

 of striae separated by a naiTow blank line. 



N. elliptica (K.). — Elliptic or linear- 

 elliptic, vnih. roimded ends ; striae di- 

 stinct, connivent, 27 in -001", divided 

 into two series on each side the median 

 space by a longitudinal line. =iV; Par- 

 mula, KA. p. 80; N. ovalis, SD. i. p. 48, 

 pi. 17. f. 153. Europe. 



N. pygm(Ba (K.). — Minute, elliptic or 

 oblong-elliptic, with rounded ends, hya- 

 line, with very faint, close striae, and a 

 panduriform blank median space. KA. 

 p. 77. =N, mimitula, SD. i. p. 48, pi. 31. 

 f. 274. In brackish or fresh water. 

 France, England. Although the striae, 

 which are very indistinct, are not inter- 

 rupted, yet the peculiar form of its me- 

 dian space shows that its proper position 

 is in this gToup. 



N. cestiva (Donkin). — Large, narrow- 

 elliptic, with rounded ends ; striae fine, 

 distinct, costate or obscurely moniliform, 

 reaching nearly to the median line, 

 crossed on either side near their inner 

 ends bv a longitudinal line. TM. vi. 

 p. 32, pi. 3. f. 18. Marine. Northum- 

 berland. This beautiful species differs 

 from N. Smithii in its more gracefully 

 elliptical figure, in its costate and much 

 finer striae, and in the darker-brown 

 colom* when mounted in balsam. The 

 dry valve is pale-brown. Donkin. 



N. AUmaniana (Greg.). — Small, oval, 

 with subacute apices ; costae about 20 in 

 •001", somewhat radiant, nearly reaching 

 the median line, divided by a line near 

 to and concentric with the margin. = 

 Pinmilaria AUmaniana, GD. p. 16, pi. 1. 

 f. 21. Marine. Scotland. The marginal 

 series of costae narrow, conspicuous, 

 border-like ; the inner one fainter. 



2 t Valves linear, with dilated centre 

 and ends. 



N. Rahenhorstii (Ralfs). — Elongated, 



slender, gradually dilated at centre and 

 broadly rounded ends ; striae fine, short, 

 divided on each sid« the median line by 

 a naiTow, blank, longitudinal line. = Pin- 

 milaria interrupta, Bab D. p. 44, pi. 6. 

 f. 3. Italy. Divided by two constric- 

 tions into three oblong portions ; the 

 interrupting line undulated like the 

 margins. This species resembles a slen- 

 der N. nohilis with interrupted striae. 



F. Valves with capitate or rostrate apices, 

 t Valves inflated or ventricose. 



N. Crux (E.). — Cruciform, with di- 

 verging costae, which do not reach the 

 median line. = Pinnularia Crux, EM. 

 pi. 12. f. 37. Asia, Cassel. This species 

 has the lateral view like a Biblarium, but 

 with median line and nodide. 



N. Trochus (E.). — With strongly in- 

 flated middle, and obtuse, rostrate ends, 

 longitudinally striated. Elnf. p. 179, 

 pi. 21. f. 8. Fossil. Sweden. 1-860". 



N. inflata (K.)- — Minute ; with much 

 inflated centre, and short, obtuse, beak- 

 like ends ; strife wanting or indistinct. 

 KB. p. 99, pi. 3. f. 36=iV: Follis, EM. 

 several figiu*es. Fossil, Sweden, Santa 

 Fiore ; recent, Europe. 



N. amphisbcena (Bory). — Inflated, 

 elliptic, with capitate or conic apices ; 

 strife close, delicate. E Inf. p. 178, pi. 13. 

 f. 7 ; SD, i. p. 51, pi. 17. f. 147. Common. 

 Europe, Asia, Africa, America. (^t:i. 72 ; 

 IX. 141.) 1-1700" to 1-240". Median 

 nodide orbicular. The Pinnularia am- 

 phisbcena, EM., is probably a state of this 

 species exhibiting more conspicuous 

 striae. 



N. Placenta (E.). — Minute, ventricose, 

 roundish-elliptic, with a nipple-like pro- 

 ! jection at each apex, EM. pi. 33. 12. 

 ' f. 23. Oregon. 



N. sphcerophora (K.). — Elliptic-lance- 

 olate, strongly constricted into capitate 

 or conic apices; striae wanting or in- 

 distinct. KB. p. 95, pi. 4. f. 17 ; SD. i. 

 p. 52, pi. 17. f. 148. Europe, Asia. Very 

 similar to N. amphisbccna^ but it is less 

 inflated, and it appears destitute of striae. 

 According to Rabenhorst, it difliers also 

 bv having faint longitudinal lines. 

 1^320". 



N. hrevis (Greg.). — Small, elliptic, 

 contracted into short, broad, mammiform 

 ends ; striae fine, about 35 in -001", 

 nearly reaching the median line, shorter 

 opposite the indefinite central nodule. 

 GD. p. 6, pi. 1, f, 4. Scotland. Professor 

 Walker Arnott is probably correct in 

 uniting this to N, amphishcena. 

 3m2 



