96 r. T. CLEVE, SYNOPSIS OF NAVICULOII) DIATOMS. 



space, half as bvoad as the val ve and crossed by somewhat radiate rows of alveoli. Rows of alveoli 

 8 in 0,01 mm. Alveoli S in O.oi mm. — Å^av. micrntatos Pant. I p. il Pl. IX f. 80. 



Marine: Szåkol, Hnngaiy, fnss. ! Sontli Naparina, Trinidad, foss. (Deby Coll.)! 



Var. Christianii T. C. — L. O.045; B. 0,04 mm. Median rows of the alveoli at the margin 

 alternatel}' longer and shorter, 11 in 0, 01 mm. — Raphidodiscus Mnrylandica, Christianii and 

 Fchiijcrii T. C. Micros(^ope 1889, according to Wolle D. of N. Am. Pl. LXXXIV f. 1 to 4. Icoii. 

 11. Pl. II f. 1. 



Marine: Cambridge, Marjdand, fossil (Deby Coll.)! 



()4. D. Smithii Bréb. (185fi). — V. elliptical. L. 0,u27 to O.o.t; B. O,oir> to 0,o35 mm. 

 Central nodnle small. Terminal nodnles close to the ends. Furrows narrow, close to the horns. 

 CostEB 7 to 11 in 0.11 mm. alternating with donble rows of alveoli disposed in obliquely decussa- 

 ting lines. twice or more as close as the costee. — Nar. elliptica W. Sm. B. D. I p. 48 Pl. XVII 

 f. 152 a. N. Smitliii Bréb. in W. Sm. B. D. II p. 92. N. Smithii v. horeaUs f. minor Gru\. Franz 

 Josephs Land D. Pl. 1 f. 41. N. Smithii A. S. Atl. VII f. 16, 17. N. S. D. I f. ig.? A: ScutcUmn 

 V. H. Syn. Pl. IX f 11.? Nav. Sm.ifhii rar. loris Dannf. Baltic D. p. 30 Pl. II f. 15. 



Marine and brackish: Franz Josephs Land ((xrun.), Spitzbergen! Sea of Kära I Finmark 1 

 Baltic! Grulf of Bothnia! North Sea! Mediterranean Sea! Madagascar! Seychelles! Tasmania! Java! 

 New Zealand! Colon! Campeachy Bay! 



Nar. Dåcsyi (Pant. II p. 45 Pl. XIV f. 247, 1889) from Bremia in Hnngary, seems to be 

 a finely costate variety of D. Smithii. Its length is (),o^-2 and its breadth 0,oi7 mm. The eostai 

 are 14 to 1(5,5 in 0, 01 mm. and are described as indistinctlj' pnnctate. 



65. D. subovJilis Cl. N. Sp. — V. elliptical. L. 0,38; B. 0,oi9 mm. Central nodnle large. 

 rounded. FurroAVS narrow, closely foUowing the central nodnle and its horns. Costtt 10 in 0,oi 

 mm., alternating with donble rows of alveoli, forming oblique lines, abont 18 in O.oi mm. — 

 Pl. I f 27. 



Fresh water: New Zeeland, Paeroa. 



This form resembles Z). oralis in its shape and large central nodnle, but has the strncture 

 of D. Smithii. 



(M^i. D. borealis G-run. (1884). — V. elongate-elliptical. L. 0,g5 to 0,o7s; B. 0,025 to0,o265 

 mm. Central nodnle elougated. Fnrrows narrow, dilated around the central nodule and crossed bj' 

 costcE, interrupted by a longitudinal band. Costse 10 in 0,oi mm., alternating with rows of alveoli. 

 forming obliqne longitudinal lines, abont 24 in 0,oi mm. — Nar. Svrithii rar. borralis Grun. 

 Franz Josephs Land D. p. 56 (4) Pl. I f. 40. Nav. fusca Donk. B. D. Pl. I f. 5.? 



Marine: Franz Josephs Land (Grun.), Matotschin Sharr, Sea of Kära! Gnllmarefjord! Java 

 (var. L. 0,042; B. O.oi" mm. Costfe 8 pnncta 17 in O.oi mm.). 



Var. suhconstricta Cl. — V. slightly constricted in the middle. L. 0.5s; B. 0,02 mm. Costtt 

 10, alveoli 24 in 0, 01 mm. Furrows narrow, the ccstcC uot interrupted by a longitudinal band. 



Marine: Campeachy Bay! 



This form resembles D. vaciUans, from which it ditfers by the alveoli forming oblique roA\'s. 

 The fig. 14 and 15 Pl. VII in A. S. Atl. seem to belong to D. borealis. 



67. D. major Cl. N. Sp. — V. elliptical. L. 0,0 7 to 0,17; B. 0,037 to O.or, mm. Central 

 nodule large, rounded (juadrate. Terminal nodnles distant from the ends. Fnrrows rather broad; 

 their outer margins enclosing a .space ' \, to '/,, as broad as the valve, crossed hy costte and donble 

 rows of alveoli. Costse 5 to 7 in 0,oi mm. alternating with donble rows of alveoli, 7 to 15 in 

 0,01 mm., forming oblique lines. — Nav. Smithii A. S. Atl. VII f. 19' (tyiDical)! -l-I. 21. 18. 

 V. H. Syn. Pl. IX f. 12. Suppl. Pl. B. f. 23. 



Marine: North Sea! Marocco! Barcelona! Madagascar! Macassar Straits! Sumatra! Chinal 

 Japan! Australia! S:ta Monica, Calif. fossil! Colon! 



I 



