808 



STSTE.MATIC HISTORY OF THE INFUSOEIA. 



character into some of the definitions, 

 strige are more distinct and more easily 



* Lateral view obIo?ig or lanceolate, 

 sometimes sliyhtly constricted beneath 

 the apices. 



t Septa straight or fumiel-shaped. 



Grammatophora stricta (E.). — 

 Large, wath straight, parallel septa ; 

 lateral view lanceolate. B^B. t. 29. f. 76. 

 Asia, Africa, America. 



G.parallela, EM. pi. 21. f. 26. We 

 know not how this form diiiers from 

 G. stricta, except that the figures of the 

 lateral valves exhibit more rounded 

 apices. 



G. Tahellaria, EM. pi. 18. f. 89, 90. 

 Fossil. Virgmia. In Elirenberg's figures 

 the front view has the septa slightl}^ 

 cm'ved and dilated inwards (fimnel- 

 shaped) ; lateral view lanceolate, with a 

 large central canal. 



2 1 Septa with a semicircular curv-e near 

 the marginal ends ; otherwise straight. 



G. marina (Ljug., K.). — Septa with 

 a single curvatm-e ; lateral view linear- 

 obloug, gradually tapering into the ob- 

 tuse apices. KB. t. 17. f. 24. = Diatotna 

 tcenicefonne, D. marinum (Lpig.), and 

 D. latruncalarium (Ag.), D. hrachy- 

 ffonium (Carm.), Bacillaria CleopatrcB 

 (E.)., B. Adriatica and B. Meneghina 

 (Lobarzewsky), Grammatophora oce- 

 anica. Everywhere. Common, often 

 forming long chains, (iv. 47 ; xi. 52, 53.) 

 The synonyms are adopted from Kiitzing, 

 and probably some of them belong to 

 other species. The frustules are of very 

 variable length, sometimes nearly square, 

 sometimes many times longer than broad. 

 Connecting hinge slender. 



G. tropica (K.). — Laro-e, ssAW striated 

 margin ; septa with a single curvature ; 

 lateral view linear, \\dth rounded apices. 

 KB. t. 30. f 71. Cape of Good Hope. 

 1-600" to 1-156' 

 tumid. 



G. gihha (E.). — Large, striated; septa 

 curved at outer end, otherwise straight ; 

 lateral view linear, with slightly in- 

 flated centre and rounded ends. KB. 

 t. 29. f 77. Cuba. (xi. 48, 49.) 



G. Mexicana (E.). — Large ; septa with 

 a single cm'vature ; lateral view con- 

 stricted beneath the rounded apices. KB. 

 t. 18. f. 1-6. Em-ope, America. Con- 

 necting hinge tumid. 



G. gibberula (K.). — Margin striated ; 

 septa once curved ; lateral view lanceo- 



Connecting hinge 



we use it merely to indicate that the 

 detected. 



late, with tumid centre and obtuse apices. 

 KB. t. 30. f. 81. Naples. 1-450". Con- 

 necting hinge slender. Difters from G. 

 Mexicana in its distinctly striated mar- 

 gin and more lanceolate lateral view. 



G. macilenta (S.). — Frustides often 

 cmved; septa as in G. marina-, lateral 

 valve linear, slightl}' inflated at centre 

 and extremities ; striae 60 in -001". SBD. 

 ii. p. 43, pi. 61. f 382. Britain ; Levant. 

 " The front view in this species is always 

 narrower in proportion to its length than 

 in G. marina. The strise are also far 

 more numerous ; and the frustule, espe- 

 cially in the larger specimens, shows a 

 decided tendency to assmne a cm'ved 

 form." 



3 1 Septa Innately curved, both ends 

 hooked inwards. 



G. hamidifera (K.). — Small, subqua- 

 drate ; septa cmwed throughout, with 

 their concavities towards each other. 

 KB. t. 17. f. 23. Common, especially 

 from deep water, (xiii. 22.) _ 1-2400" 

 to 1-960". Distinguished by its small 

 quadrate frustules and imiformly cm*ved 

 septa. It is possible, however, that it 

 may be the immature state of one of the 

 following species. 



4t Septa undulate, inner ends incm-ved. 



G. angidosa (E.). — Septa hooked in- 

 wards, at inner end and near the margin 

 of fr-ustule with angular curve inwards. 

 KB. t. 30. f. 79. Atlantic and Pacific 

 Oceans. Perhaps a variet}' of G. Afri- 

 cana. 



G. Africana (E.). — Septa with three 

 undida'tions, the inner ends incm'ved ; 

 lateral view lanceolate, obtuse. EM. 

 pi. 19. f. 34. Fossil, Gran ; recent, not 

 uncommon. 1-2300" to 1-480". 



G. Islandica (E.). — Septa with three 

 undulations, cui^ed at the centre ; lateral 

 view navicular, striated. KSA. p. 121. 

 Iceland. 



G. serpentina (E.). — Large, vnth. stri- 

 ated margin; septa with several undu- 

 lations and incurved inner ends ; lateral 

 valves linear, "wdth attenuated ends and 

 obtuse apices; connecting hinge thick. 

 SBD. ii. p. 43, pi. 42. f 315. = G. 3fedi- 

 terranea (E.), according to Kiitzing. Not 

 uncommon in sheltered bays. Remark- 

 able for its seii)entine septa, the number 

 of curves seeming to vary according to 

 the length of the frustule"; and we fear 



