OF THE NAVICULE.^. 



933 



p. 213 ; SD. ii. p. 79, pi. 59. f. 371. Eu- 

 rope. Colour pale yeUowisli, sometimes 

 brownish. Naviculge 1-1380". 



M. investens (Montagiie). — Fronds 

 parasitic, minute, lubricous, brown, 

 opaque, fasciculated j filaments dilated 

 at the base, diiiusely ramose ; branches 

 anastomosing ; naviculse large, in one or 

 two s,ei::\QS,. = Schizonema investens, Mont. 

 Annales des Sci. Nat. 1850, p. 308. 

 Guiana. Navicul^e with two nuclei. 



M. mucosum (K.). — Frond soft, highly 

 mucous; filaments contiguous and con- 

 fluent ; branches iiTegular ; naviculse in 

 few files; valves elliptic-oblong, with 

 rounded ends, delicately striated. = 'S'c/»- 

 zonema mucosum, IvB. p. 115, pi. 26. f. 9 ; 

 SD. ii. p. 75, pi. 57. f. 360. Adriatic Sea, 

 England. This species can scarcely be 

 the Schizonema tenue of Agardh, as 

 Kiitzing has supposed. 



M. jKtrvum (Me.). — Frond olive-green, 

 -mucous; filaments hyaline, simple (?), 

 much entangled and cm-ved ; navicidse 

 in distinct, loose, oblique or straight 

 series ; valves lanceolate. = Schizonema 

 parvum, Me KA. ^. 100. Venice, Cay- 

 enne. Naviculae in front view linear, 

 rectangular. 1-1200". 



M. 3Ieneghinii. — Frond green, very 

 gelatinous; filaments very hyaline, lu- 

 bricous, fastigiately divided and laci- 

 niated ; naviculse lanceolate, in loose, 

 rather distant sevies. = Scliizonema bom- 

 hycinum, Me KA. p. 100. Venice. 

 1-1200". 



M. Kiitzingii. — Fronds tufted, intri- 

 cate, much branched ; filaments hyaline, 

 with rather acute apices; naviculse in 

 distinct series ; valves lanceolate, acute. 

 = Schizonema JloccosiwiyJiH. p. 113, pi. 24. 

 f. 3. Germany. Naviculse in front view 

 oblong, truncate. 1-600". 



M. crispum (Mont.). — Fronds small, 

 crisped, capillary, green, branched : fila- 

 ments obtuse, dilated and multifid at 

 the apex ; naviculse very minute, much 

 crowded in obsolete sevies. = ScJnzone7na 

 crispum, KB. p. 113, pi. 29. f. 71. Auck- 

 land Islands. 



M. plumosum (K.). — Frond tufted, 

 wavy, rather curled, green, fastigiately 

 branched ; filaments densely fiUed at the 

 ends, dilated, multifid ; naviculse distinct, 

 very minute ; valves oblong-eUiptic, vdih. 

 rounded ends. = Schizonema plumosum, 

 KB. p. 113, pL 26. f. 1. Europe. Navi- 

 culse in front "^dew oblong, truncate. 

 1-1440". 



M. Zanardinii (Me.). — Frond very fine, 

 pale green ; filaments capillary, gradually 

 separating into corymbose arachnoid 



branches of one series ; naviculse in loose 

 series, four times as long as broad; 

 valves elli-ptic. = Schizone77ia Zanardinii, 

 Me. p. 453. Venice. Navicidse in front 

 view exactly linear. Fronds in globular 

 tufts, which, dried upon paper, form 

 imiform spots, in which the separate 

 threads can only be distinguished by a 

 lens. In its mode of ramification it re- 

 sembles M.JlageUiferum, Me. 



IsL. jiagelliferum (K.). — Fronds very 

 minute, tufted, parasitic, floccose, capil- 

 lary; branches erect, separated at the 

 apex into flagelliform fibres; series of 

 the verv minute naviculte and internal 

 tubes distinct. KB. p. 116, pi. 24. f. 4. 

 = Scliizonema JlageUiferum, Me. 1-1920" 

 to 1-1560". 



M. jioccosum (K.). — Frond minute, 

 subcapillary, branched, rather delicate, 

 gelatinous ; series of the long, obtuse 

 and trimcate naviculse and internal tubes 

 verv distinct. KB. p. 116. Adriatic Sea. 

 1-720". 



M. intricaium (K.). — Frond delicate, 

 subgelatinous, nebulose, pallid yeUow, 

 irregularly branched ; branches patent, 

 upper ones abbreviated; series of navi- 

 cidse loose, intermixed with very fine 

 longitudinal fibres ; naviculse oblong, 

 obtuse, very minute, KB. p. 116, pi. 26. 

 f. b. = Schizonema intricatum. Me. Eng- 

 land. 1-1440" to 1-680". 



M. homhycinum (K). — Frond pale yel- 

 low, contorted, twisted, much branched, 

 capillary ; naviculse remotely concate- 

 nate, inconspicuous, and verv minute. 

 KB. p. 116, pL 26. f. 6. = Schizonema 

 homhycinum, Me. Europe, (xiv. 4-3, 44.) 



M. ? Agardhii (E.). — NaviculfB very 

 naiTow, acute, arranged in a simple 

 series ^vdthin a proper tube ; tubes fas- 

 cicidately joined into a filament. = ASb/ii- 

 zonema Agardhii, E Inf. p. 238, pi. 20. 

 f. 16. North Sea. (x. 208.) Professor 

 Kiitzing unites this species with 31. hom- 

 hycinum; but the frustules are apparently 

 (judging from the respective figures) 

 much larger. 



M. patens (K.). — Frond minute, para- 

 sitic, floccose-capillary, soft, gelatinous ; 

 branches divergent or patent, with ob- 

 tuse apices; series of naviculse and in- 

 ternal tubes distinct ; naviculse very 

 minute. KB. p. 116, pi. 24. f. b. = Schi- 

 zonema patens. Me. 1-2400". 



M. Uneatum (K.). — Frond decumbent, 

 intricate, capiUaiy, olivaceous, tenacious, 

 lubricous, subramose; branches at the 

 apex attenuated, curved, rather obtuse ; 

 series of the very minute lanceolate 

 naviculse distinct/ KB. p. 116, pi. 23. 



