'GO 



SYSTEMATIC HISTORY OF THE IXFUSOEIA. 



Asia, Aii-tralia, and America, (xv. 11.) 

 \'alve Innately ciu'ved. Sporangial frus- 

 tules %\-ith somewhat angular dorsum. 

 A common species, easily recog-nized by 

 the distinct • marginal stride intei-posed 

 between the rather distant, conspicuous 

 bead-like ocelli. 



E. ulpcstris (K.). — Front view rectan- 

 gidar or subcuneate, with conspicuous 

 marginal ocelli and interposed strice ; 

 valves narrow, arcuate, \\dth the romided 

 apices scarcely a little recurved. KB. 

 p. 84, t. 5. f. 16. = ^5". ostrantina, Rab Diat. 

 p. 11), t. 1. f. 29? France, England, 

 (xiii. 8.) AVe are unable to distinguish 

 this species from^. Ar(/m ; for we believe 

 that the subcuneate front view is an 

 accidental variation, and in specimens 

 from M. de Brebisson we find that cha- 

 racter by no means constant. Striae are 

 interposed between the ocelli, as in JiJ. 

 Atu/iis, and are nearly, if not quite, as 

 distant as in that species ; and we doubt 

 whether recur\ed extremities of the 

 valves are not sometimes found in both. 



E. reticulata (Nag.). — Front viewrect- 

 angidar, margins with stronger capi- 

 tate and intermediate finer ones ; valves 

 slightly curved, the obtuse ends some- 

 what attenuated ; strine strong, 3 to 5 in 

 1-1200" ; the interstices regularly reticu- 

 lated, veined, margins finely transversely 

 striated. KSA. p. 869. Switzerland. 



E. loiu/icoDiis (E., S.). — Front \'iew 

 subrectangidar, with conspicuous mar- 

 ginal ocelli and strife, as in JE. An/us ; 

 valves elongated, curved, with obtuse 

 ends and slightlv angular dorsum. 

 8B1). pi. ;iO. i. 247. = Einwtia lomji- 

 cornis, EM., several figures. Europe, 

 Asia, and America, (xv. 0-9). Costae 

 strong, alternating with striated spaces. 

 Perhaps a sporangial state of E. An/us. 



E. oceUata (P]., K.). — Front view bar- 

 rel-shaped, with conspicuous marginal 

 ocelli and interposed strijie ; valves lu- 

 nately curved, with roimded apices, KB. 

 p. U, t. 29. f. 57 ; SBD. pi. 1. f. 6. =Eu- 

 Hotia ocelldta, E. Fresh water. Europe 

 and America, Fossil, Greece. 



E. Ei((j(>)(ue (S,), — Front view inflated, 

 witli truncate extremities ; valves lunate, 

 with straight, truncate extremities ; 

 costac distinct, 8 in -001"; oceUi con- 

 spicuous ; stricG 32 in -OOl". S An. 

 .Jan, 1857, p, 7, pi, 1, f. 1, Freshwater. 

 Biarritz, France. The nearest allies of 

 tills species are E. prohoscidm and E. 

 Sorex. It may bo distinguished from 

 the first by its distinct ocelli, and from 

 the second by its conspicuous cosUe and 

 their areola-iike interspaces, S. 



E, comta (E,), — Small ; valves curved, 

 with regularly convex dorsum and 

 rounded ends ; strife strong and gi-a- 

 nidar, = Eunotia comta, EA. 1840, & M. 

 pi. 6. 2. f. 17 e,f. Fossil. Greece. We 

 are not certain whether this and the next 

 species are correctly placed in the ocel- 

 lated section. 



E. Hellenica (E.). — Valves long, 

 cur^-ed, with regularly convex dorsimi 

 and rounded ends ; costjTe strong, 4 in 

 1-1200", having very delicate striae in- 

 tervening between i\\^VL\.= Eunotia Hel- 

 lenica, EA. 1840, & M. pi, 6. 2. f. 17 a, b. 

 Fossil. Greece. 



3 * Castes not capitate. 



E. constricta (Breb.). — Front view 

 elliptical, slightly constricted at the 

 middle ; valve semilunate, with 8 distinct 

 costa3 in -001". SBD. vol, i. p. 14, pi. 

 30. f, 248. Brackish water. France and 

 England, Strife 30 in -001". S. 



E. maryaritifera (Rab.). — Front view 

 barrel-shaped, with truncate ends and 

 striated margins ; valves with three dor- 

 sal undulations and rounded ends ; costae 

 4 to 5 in 1-1200"; bordered by puncta. 

 Rab Diat. p. 17, pi. 1. f. 32. Persia. 



E. Musculus (K.). — Front view sub- 

 orbicidar ; valves lunate, with very con- 

 vex dorsum, concave venter, and taper- 

 ing acute apices; costae distinct. KB. 

 p. 33, t. 30. f. 6; SBD. pi. 1. f. 10. = 

 Eunotia Sphcerula, EM. pi. 8. 1. f. 6 ? 

 Brackish water. Em-ope, Asia, Africa, 

 and America, (xin. 18.) Striae 40 in 

 •001". S. 



E, rupestris (S.). — Front view elliptic 

 or elliptic-lanceolate ; valves semilan- 

 ceolate, tapering to the subacute apices ; 

 costae distinct ; striae faint, 40 in -001". 

 SBD, vol. i. p. 14, pi. 1. f. 12. E. cjihhe- 

 rula, KB. t. 30, f, 3 ; KA. p. 3. = E. 

 Westermanni, SBD. vol. i. p. 14, pi. 1. 

 f. 11, Fresh or brackish water. Europe 

 and America. 



E. quinquccostata (Rab.). — Valve semi- 

 lanceolate, M'ith obtuse ends, and five 

 somewhat converging costae. Rab Diat. 

 p. 18, t. 1. f. 35. Germany. 



E. Hyndmani (S.). — Front view ven- 

 tricose witJi truncate ends ; valves stout, 

 lunately curved, with rounded apices; 

 strifie moniliform, IG in -001"; costaB in- 

 conspicuous, SBD, vol. i, p. 12, pi. 1. f. 1. 

 = Eunotia Luna, EM. pi. 15 a. f. 58. 

 Britain, Large ; valve not recurved. 



E. Westermanni (E,, K,),— Front view 

 elliptic ; vah es semilunate, with turgid, 

 coii\(;x dorsum gradually attenuated to 

 the rather obtuse not prominent apices ; 



