938 



SYSTEMATIC HISTORY OF THE INFXJSOEIA. 



For C. rectangula (p. 811), substitute : — 



C. Meneghiniana (K.). — Front view 

 rectangular ; valves minute, with smooth 

 centre and rather coarse marginal striae. 



For C. Dallasiana (p. 



C. Dallasiana (Sm.). — Frustules with 

 flat ends ; valves with biillate-rugose 

 centre and coarse marginal striae. SD. 

 ii. p. 87. = C. radiata, Bri. TMS. viii. 

 pi. 6. f. 11. Brackish water. Europe, ^ 

 America, 



C. minutula (K.). — Frustules with' 

 flat ends ; valves with radiating dots or 

 striae at centre. KB. pi. 2. f. 3. = C. 



KB. p. 50, pi. 30. f. 68. C. rectangula, 

 Rab D. p. 11. Europe. Fresh water. 



813), substitute: — 



opermlata, SD. i. p. 28, pi. 5. f. 48. Eu- 

 rope. (Kiitzing, however, describes his 

 C. minutula as undulate.) 



C. Kiitzingiana (Th.). — Ends of frus- 

 tules undulate J valves with convex, 

 smooth centre, and long, coarse mar- 

 ginal stri^B. SD. i. p. 27, pi. 5. f. 47. 

 Brackish water. Eui'ope. 



CoccoNEis Finnica. — On careful ex- 

 amination of several fossil deposits said 

 by Ehrenberg to contain this species, we 

 can find no foi-m resembling the figures in 

 the ^ Microgeologie,' excepting Navicula 

 elhptica. 



EupoDiscus ? Peruvianus (Kitton, 

 MS.). — Valve orbicular, finely pimc- 

 tated, with two smaU, roundish sub- 

 marginal processes, and a submarginal 

 series of close minute apiculi. Peruvian 

 and Calif ornian guanos. We regard the 

 genus of this Diatom as doubtful. The 

 valve has some resemblance to an Au- 

 liscus ; but the puncta are not in flexuose 

 lines. The processes, as seen in front 

 view, are short and subtruncate, and 

 the circle of apiculi which connects 

 them shows an aflinity to Cerataulus. 

 The processes of the one valve alternate 

 with those of the other, and are often 

 visible at the same time. 



E, ? Grevillii (Ralfs, n. sp.). — Disc ob- 

 scurely punctate, with (3) clavate intra- 

 marginal processes, and a circlet of spines 

 between the processes and the centre. 

 Monterey. Dr. Greville. The processes, 

 which are rather distant from the mar- 

 gin, resemble those of Aulacodiscus, and 

 the circlet of spines that of Systephania ; 

 but the absence of connecting lines re- 

 moves it from the former, and the pre- 

 sence of processes from the latter genus. 



PoDOSiRA ? compressa (West). — Frus- 

 tule geminate, free ? ; polar always shorter 

 than equatorial diameter j valves elliptic, 

 obscurely punctate ; puncta scattered ; 

 angulum smooth. Creswell Sands, 

 Druridge Bay, Yannouth Sands. West, 

 TMS. viii. p. 150, pi. 7. f. 11. (vin. 34.) 

 This form occurs plentifully on the sands; 

 the frustules always occur in pairs. The 

 absence of stipes or any attachment, the 

 compressed valves, and the want of a 



thickened umbilicus, render its position 

 in the present genus doubtful. 



Epithemia {Eunotia, E.) Sancti An- 

 tonii = E. Beatoruni = Denticuta ? lauta 

 (Bail.). — This species has been foimd 

 by Mr. Kitton in the Monterey-stone and 

 Richmond deposits; in the latter they 

 occur in filaments of 6 and 7 fi'ustules, 

 clearly showing that they are improperly 

 placed in the present genus, and are pro- 

 bably allied to Denticula. 



Navicula hullata (Norman, n. sp.). — 

 "Elliptical, extremities slightly pro- 

 duced; striae in a marginal and two 

 central bands ; marginal band of un- 

 equal width ; the blank spaces between 

 the granules studded mth a line of cir- 

 cular bosses; striae moniliform, 14 in 

 001". Stomachs of Ascidians, Shark 

 Bay, Australia " (Norman in litt.). 



N. Sillimanorujn (E.). — Inflated at the 

 centre ; apices produced, rounded, and 

 constricted ; striae radiant, not reaching 

 the median line. EM. pi. 2. 2. f. 13.= 

 Pimiularia SilUmanorum, EA. p. 133, 

 New York deposit. This species re- 

 sembles Gomplionema geminatiim, but is 

 distinguished by its less conspicuous 

 striae and equal ends ; the figure in EM. 

 represents only a fragment. 



N. Cypri7im (E., K.). — Small; valves 

 oblong, slightly contracted into the very 

 broad obtuse ends ; central nodule ob- 

 long ; striae evident. 103. p. 99, pi. 29. 

 {.'So. = Fimmlaria Ci/prinus, EA. pi. 1. 11. 

 f. 7. Chili. ''^ ^ 



N. Reinickeana (Rab.). — Resembles 

 N. cuspidata and JV". rostrata ; but the 

 capitate ends are more prolonged, and 

 the sti'ias are only 30 in -001". Rab. 

 Algen Sachs. No. 802. Dresden. 



Aulacodiscus Sollittianus (Nonnan, 

 MS.). — "Disc large, hyaline, %vith six 

 conspicuous processes, distant from mar- 



