154 p. T. CLEVE, SYNOPSIS OF THE NAYICULOID 1)IAT(»MS. 



41. N. (Libellus) aponiiiii Kutz. (1836). — V. narrow, lanceolate, acute. L. 0,02.5; B. 0,oo4 

 mm. Axial and central areas indistinct. Stria? about 30 in 0,oi mm. Connecting zone longitn- 

 dinally striate. — Jirarhi/sira aponina Kiixz. Dec. N:o 153 (according to Lagst.). Nov. apon. Kiixz. 

 Bac. p. 91 PI. IV f. 1". V. H. Syn. PI. XTl f. 15. Lagst. ('^fvers. at K. Sv. Vet.-Akad. Fiirh. 

 1884 PI. X f. 8. Lihdlus apon. DkToni Atti del R. Inst, de Scienze (.ser. VII) VIL p. 967. 



Hot springs: Abano (Italy). 



The above description is from the figure in V. H. Syn. as I have had no opporti;nity of 

 examining this species. 



42. N. (Libellns) Buliiheiiuii (tkin. (1S80). — V. linear-lanceolate, with rostrate to capitate 

 ends. L. 0,02; B. 0,00:3 mm. Areas indistinct. Striae parallel, 30 in O.oi mm., the two median 

 stronger. — Grun. in V. H. Syn. p. 108 PI. XIV f. 6 a. 



Salines: »Sulza> (Rabh. Alg. 1301)! 



Var. belf/ica Grun. — V. Avith somewhat olitnse ends. Connecting zone with fine, longitudinal 

 strict (V. H. Types N:o 113). 

 Marine: Ostend. 



43. N. (Libellus) haiiuilifera GrfiX. (1880). — V. lanceolate, sometimes slightly asymme- 

 trical, with subacute ends. L. 0,051 to 0,0.58; B. 0,012 to 0,oi4 mm. Median line with somewhat 

 approximate central pores. Its terminal fissures distinct, hook-shaped, turned in the same direction 

 and at some distance from the ends of the valve. Areas indistinct. Striic in the middle 19 to 21 

 in 0,1)1 mm. slightly I'adiate, at tlie ends 25 in 0,oi mm., parallel, punctate; puncta, about 20 in 

 0,(11 mm., forming undulating longitudinal rows. — CtRun. A. D. p. 44. Icon. n. PI. Ill f. 16, 17, 18. 



Marine: Mediterranean Sea ((Irun.), Adi'iatic (Grun.), Sebastopol ! Ceylon (Weissflog Coll.)! 

 Java! Barbados! 



Var. intcrrupta Cl. — L. 0,i; B. 0,02 mm. V. as in N. Lihcllns. Stri.e interrupted on 

 each side of the median line by a narrow longitudinal area. Striffi 20 to 21 in 0,oi mm. Puncta 

 23 in 0,01 mm. — PI. Ill f. 19. 



Marine : Japan ! 



N. hcwmlifcra ciosely resembles N. Lihcllus and is characterized by its hook-shaped, terminal 

 fissures. 



44. N. (Libellus) plicata Doxk. (1873). — V. linear, convex, with obtuse ends. L. 0,og to 

 0,09; B. 0,012 to 0.(1 ui mm. Terminal nodules close to the ends. Ai'eas indi.stinct. Stria? in the 

 middle 17 to 19 in 0,oi mm., almost transvei'se, at the ends 20 to 21 in O.oi mm., also transverse, 

 finely punctate, puncta about 18 in O.oi mm. forming longitudinal, undulating rows. Frustule 

 in the zonal-view with fine, longitudinal striic on the connecting zone. — Donk. B. D. p. 59 PI. IX 

 f. 2. Grun. A. D. p. 36. 



Marine: Kara Sea (Grun.), England! Scotland! Baltic (Grun.), Balearic Islands! Trie.st (Grun.), 

 Labuan! Brazil! 



Var. sumatrmm Cl. — V. very convex with more acute ends. L. 0,13 to O,!:; B. 0,017 to 

 to 0,02 mm. Axial area indistinct; central small, orbicular. Stria' 15 (middle) to K! (ends) in 

 0,01 mm. transverse throughout, coarsely punctate, puncta about 17 in 0,oi mm., forming un- 

 dulating longitudinal rows. — N. o.reia Caste. I). Challenger Exp. p. 31 PL XX f. 8 (1886)? 



Marine: Island of Muntok, Sumatra (Grove Coll.)! Java! 



45. N. Oarkeana Grun. (1863). — V. linear, witli obtuse ends. L. 0,04 to 0, oil's; B. o,(iii to 

 0,015 mm. Axial area indistinct; central very small, elongated. Striic 18 to 19 in 0,oi mm., 

 almost parallel, distinctly punctate; puncta about 20 in 0,oi mm., forming longitudinal rows. 

 Frustule in zonal-view arcuate, subrectangular, with broad connecting zone, on which are 2 to 4 

 rows of sliort stria; (13 in 0,oi mm.). — lihoicoucis Gar. Grun. Verb. 1863 p. 14S PI. TV f. 12. 



Marine: Behrings Strait! Kamortha! (California! North Pacific Ocean (Grun.). 



