154 P. T. Cr-EVE, SYNOPSIS OF THE NAVICULOID DIATiiMS. 



41. N. (Libellus) iipouiiiii Kiirz. (183(5). — V. narrow, lanceolate, acute. L. 0,025; B. 0,oo4 

 mm. Axial and central areas indistinet. Strite about 30 in 0,01 mm. Coniiecting zone lougitu- 

 dinallj^ striate. — Brachysira aponina KtJTZ. Dec. N:o 153 (according to Lägst.). Nav. apon. KCtz. 

 Bac. p. 91 Pl. IV f. 1". V. H. Syn. Pl. XII f. 15. Lagrt. Öfvers. af K. Sv. Vet.-Akad. Föi-li. 

 1884 Pl. X f. 8. Libellus apon. De Toni Atti del R. Inst. de Seienze (.ser. VII) VII p. JtttT. 



Hot springs: Abano (Italy). 



The above description is from the fignre in V. H. Syn. as I have liad no opportunitv of 

 examining tliis species. 



42. N. (Libellns) Biilniieimii G-run. (1880). — V. linear-lanceolate, with ro.strate to capitate 

 ends. L. 0,02; B. 0,0().5 mm. Ai^eas indistinet. Striae parallel, 30 in 0, 01 mm., the two median 

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



Salines: >-Sulza» (Rabh. Alg. 1301) 



Var. helgica Grun. — V. with somewhat obtuse ends. Connecting zone with fine. longitudinal 

 striaä (V. H. Types N:o 113). 

 Marina: Ostend. 



43. N. (Libellns) liaiiuilifera Grun. (1880). — V. lanceolate, sometimes slightlj- asymme- 

 trieal, with snbacnte ends. L. 0, 051 to O, oss; B. 0,012 to 0,oi4 mm. Median line with somewhat 

 approximate central pores. Its terminal fissures distinet, hook-shaped, fairned in the same direction 

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

 in 0,0 1 mm. .'^lightly radiate, at tlie ends 25 in 0, 01 mm., parallel, pnnctate; pnncta. about 20 in 

 0,0 1 mm., forming undulating longitudinal rows. — Grun. A. D. p. 44. Icon. n. Pl. III f. 16, 17, 18. 



Marine: Mediterranean Sea (Grun.), Adriatic (Grun.), Sebastopol! Ceylon (Weissflog CoU.)! 

 Java! Barbados! 



Var. inferriipta Cl. — L. 0,i; B. 0,02 mm. V. as in N. Lihellns. Stria; interrupted on 

 each side of the median line by a narrow longitudinal area. StrifE 20 to 21 in O, o 1 mm. Puneta 

 23 in 0,01 mm. — Pl. III f. 19. 



Marine : Japan ! 



N. hamulifera closely resembles ]V. Lihellns and is characterized by its hook-shaped, terminal 

 fissures. 



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

 0,09; B. 0,012 to 0.0 u; mm. Terminal nodules close to the ends. Areas indLstinet. Strise in the 

 middle 17 to 19 in 0, 01 mm., almost transverse, at the ends 20 to 21 in O.oi mm., also transverse, 

 finely punctate, pimcta about 18 in 0, 01 mm. forming longitudinal, undulating rows. Frustule 

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

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



Marine: Kära Sea (Grun.), England! Scotland! Baltic (Grun.), Balearic Islands! Triest (Grun.). 

 Labuan! Brazil! 



Var. sumatrava Cl. — V. very convex with raore acute ends. L. 0, 13 to 0,17; B. O.oi: to 

 to 0,02 mm. Axial area indistinet; central small, orbicular. Stri.i: 15 (middle) to 16 (ends) in 

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

 dulating longitudinal rows. — N. oxeia Castr. D. Challenger Exp. p. 31 Pl. XX f. 8 (1886)? 



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



45. N, Garkeaiia Grun. (1863). — V. linear, with obtu.se ends. L. (),04 to0,09r>; B. O.oii to 

 0,015 mm. Axial area indistinet; central very small, elongated. Stri;t 18 to 19 in O.oi mm., 

 almost parallel, distinctly punctate; puneta 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 short striaä (13 in 0,oi mm.). — lihoivoneis Gar. Grun. Verli. 1863 p. 148 Pl. IV f. 12. 



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



