96 P. T. CLEVE, SYNOPSIS OF NAVICULOID DIATOMS. 



space, half as broad as the valve and crossed by somewhat radiate rows of alveoli. Rows of alveoli 

 8 in 0,01 mm. Alveoli 8 in 0,oi mm. — Nav. mirrofatos Pant. I p. 27 PI. IX f. 80. 



Marine: Szakol, Hungary, foss.! Sonth Naparina, Ti-inidad, foss. (Deby Coll.)! 



Var. Christiana T. C. — L. 0.045; B. 0,o4 mm. Median rows of the alveoli at the margin 

 alternately longer and shorter, 11 in 0,oi mm. — Rapkidodiscus Marylandiea, Christianii and 

 Fclnyerii T. C. Microscope 1889, according to Wolle D. of N. Am. PI. LXXXIV f. 1 to 4. Icon, 

 n. PI. II f 1. 



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



(i4. D. Smithii Br^b. (1856). — V. elliptical. L. 0,027 to 0,o.s B. (^oi.--, to 0,035 mm. 

 Central nodule small. Terminal nodules close to the ends. Furrows narrow, close to the horns. 

 Costae 7 to 11 in O.ii mm. alternating with double rows of alveoli disposed in obliquely decussa- 

 ting lines, twice or more as close as the co.stffi. — Nav. dliptiea "W. Sm. B. D. I p. 48 PI. XVII 

 f. 152 a. N. Smithii Briiib. in W. Sm. B. D. II p. 92. N. Smithii v. horealis f. minor Grun. Franz 

 Josephs Land D. PI. I f. 41. N. Smithii A. S. Atl. VII f. Ifi, 17. N. S. D. If. 19.? A. Scutdlmn 

 V. H. Syn. PI. IX f 11.? Nav. Smithii var. he vis Dannf Baltic I), p. 30 PI. II f. 15. 



Marine and brackish: Franz Josephs Land ((rrun.), Spitzbergen! Sea of Kara! Finmark! 

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

 New Zealand! Colon! Campeachy Bay! 



Nar. JDorzyi (Pant. II p. 45 PI. XIV f. 247, 1889) from Bremia in Hungary, seems to be 

 a finely co.state variety of 7). Smitliii. Its length is 0,0 5 2 and its breadth 0,017 mm. The costaj 

 are 14 to 1(5,5 in 0,oi mm. and are described as indistinctly punctate. 



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

 rounded. Furrows narrow, closely following the central nodule and its horns. Costic 10 in 0,oi 

 mm., alternating with double I'ows of alveoli, forming oblique lines, about IS in (),oi mm. — 

 PI. I f 27. 



Fresh water: New Zeeland, Paeroa. 



This form resembles Z). ovalis in its shape and lai-ge central nodule, but lias the structure 

 of J). Smithii. 



(i(>. D. borealis Grun. (1884). — V. elongate-elliptical. L. 0,05 to 0,o78; B. 0,025 to 0, 0265 

 mm. Central nodule elongated. Furrows narrow, dilated around the central nodule and crossed by 

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

 forming oblique longitudinal lines, about 24 in 0,oi mm. — Nav. Smithii var. horealis Grun. 

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



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

 (var. L. 0,042; B. 0,017 mm. Costse 8 puncta 17 in 0,oi mm.). 



Var. subconstricta Cl. — V. .slightly constricted in the middle. L. 0,5 8; B. 0,02 mm. Costte 

 10, alveoli 24 in 0,oi mm. Furrows narrow, the costffi not interrupted by a longitudinal band. 



Marine: Campeachy Bay! 



This form resembles D. vacillans, from which it differs by the alveoli forming oblique rows. 

 The fig. 14 and 15 PI. VII in A. S. Atl. seem to belong to D. horealis. 



67. I), major Cl. N. Sp. — V. elliptical. L. 0,07 to 0,17; B. 0,o37 to 0,og mm. Central 

 nodule large, rounded quadrate. Terminal nodules distant from the ends. Furrows rather broad; 

 their outer margins enclosing a space ^/^ to '/g as broad as the valve, crossed by costee and double 

 rows of alveoli. Costffi 5 to 7 in 0,oi mm. alternating with double rows of alveoli, 7 to 15 in 

 0,01 mm., forming oblique lines. — Nav. Smithii A. S. Atl. VII f 19] (typical)! 22, 21. 18. 

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



Marine: North Sea! Marocco! Barcelona! Madaga.scar! Macassar Straits! Sumatra! China! 

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



