VEGA-EXPEDITIONENS V ET ENS K A FLI G A AEBETEN. 



495 



0,01 mm. Specimens from the Balearic Islets and from the 

 Cape of Good Hope have 16 stria} in 0,oi mm. 



M. (acutiuscida Grun. Mpt. var.?) Lahiensis CI. — Valve elon- 

 gate, with almost parallel margins and subcuneate ends. Me- 

 dian line straight with approximate accompanying lines. Stria3 

 IG— 17 in 0,01 mm. parallel or a little radiant near the ends, 

 composed of puncta, forming longitudinal strife. Loculi of 

 equal size, 7 — 8 in 0,oi mm. — Length 0,o64 mm. Breadth 

 0,016 mm. — PI. 35, fig. 5. 



Mr. Grunow has kindly sent me a sketch of his not yet 

 published M. acutiuscula from the Se3^chells, which differs by 

 regular elliptic outline and has 16 — 21 stria) in 0,o] mm. 



M. (haltica Grun. var.?) Citrus CI. — Broadly oval, with 

 apiculate ends. Strise 18 — 19 in 0,oi mm., more close near the 

 ends, about 23 in 0,oi mm., composed of puncta, which form 

 longitudinal lines, at a right angle to the strife. Loculi 

 marginal of ec^ual size 8 — 10 in 0,oi mm. Median line straight, 

 with very approximate accompanying lines or furrows. Length 

 0,035 — 0,04 mm., breadth 0,o2 — 0,024 mm. — PL 35, fig. 7. 



This well defined form has very little resemblance to M. 

 baltica Grun. in Van Heurck Syn. PI. IV, fig. 24, but Mr. Gru- 

 now thinks nevertheless that it may be a variety of the 

 latter species. According to Grunow, it comes very near to 

 Fhlyctmnia minuta Klitz. I have seen the same form in samples 

 from Honolulu. 



M. KjeUmanii CI. N. Sp. — Elongate, with apiculate ends, 

 loculi marginal of almost equal size, 4 in 0,oi mm. Strife fine, 

 22 in 0,01 mm., parallel, or a little radiant in the middle, 

 punctate, puncta forming oblique lines. Median line straight. 

 Central nodule elongated. Length 0,o6 mm. Breadth 0,oi4 mm. 

 — PI. 35, fig. 6. 



Wioikoneis genuflexa Grun. (Verb. 1863 pap. 147) Strife on 

 the convexe valve 23 on the concave 20 in 0,oi mm. 



Navicula redangulata Greg. (Donk. Brit. Diat. PL X, fig. 5. 

 CI. & M. Diat. No 301). 



N. Panchra Ehb. (A. Schm. Atl. PL XI, fig. 1). 



N. diplosticta Grun. (A. Schm. Atl. PL XIII, fig. 29). 



N. multicosfata Grun. (A. Schm. Atl. PL XI, fig. 18). 



N. Apis Donk. (A. Schm. Atl. PL XII, fig. 23 and PL 

 LXIX, fig. 43). 



N. futilis A. Schm. var.? (Atl. PL XIII, fig. 18). 



N. lacrimans A. Schm. (Atl. PL XII, fig. 61). 



N, Lyra Ehb. 



