N0VARA DIATOMS. 31 



linear, with rounded ends, and extremely fine striae, fig. 4, a. (The 

 author does not distinctly allude to fig. 4, which but for the ab- 

 sence of a central nodule might be referred to Navicala Lewisiatia, 

 of Greville. 



Campyloneis Grevillei = Cocconeis Grevillei, Smith, Brit. Diat., 

 pi. 3, f. 35 = C. parmula, Bail, in Proceed. Phil. Acad., 1853.? 

 Upper valvccellules small, confluent and elongated, as they approach 

 the narrow depressed medium space. 



Var. obliqua minute, median space depressed, broad, subrhom- 

 boid, cellules minute, sometimes oblique ; confluent, elongated on 

 the margin, minute, irregular, lower valves with large radiant 

 costa?, reaching to the narrow median blank space, which is some- 

 times oblique. 



[PL iii, f. 5, a lower valve, b upper do.] 



On Ballia callitricha, New Zealand, and other parts of the 

 Southern Ocean. 



Coconeis pseudomarginata, Greyory. — Var. intermedia small, 

 finely striate, upper valve pale, yellow, median line generally 

 sigmoid. = C. Kirchenpaueriana, Rab. & Jan. [PI. ii, f. 6, a 

 upper valve, b lower.] 



Common on Alga? in the warmer seas, Cape of Good Hope, 

 Nicobar Isles, Manila, Tahiti. 



C. pellucida var. /3. minor, Grim. = C. exarata, Grun., in litt. 

 — Broad, median line straight or slightly sigmoid, furrows (longi- 

 tudinal), conspicuous, 3-5 on either side of the median space = C. 

 lineata, Ehr. Micro. Geol., vi., 1, 40 ? ? [PI. ii, f. 7, a upper valve, 

 b lower do.] On Sarcomenia intermedia, St. Paul, in the South 

 Sea, on Alga? from the Cape of Good Hope, &c. 



C. pellucida var.? y sigmoidea. — Median line sigmoid, central 

 nodule sometimes transversely dilated, longitudinal furrows some- 

 times subsigmoid or equally arcuate, abbreviated towards the margin. 

 [PI. ii, f. 8, upper valve.] On Alga?, from Tahiti, common in the 

 lied Sea. 



Cocconeis ambigua, Grun., n. sp. ?— Upper valve ? marginal stria} 

 interrupted by a smooth sub-marginal median line, following the 

 contour of the valve ; marginal stride distinct, sub-radiant, 40 in. 

 •001, interior part of the valve longitudinally and transversely 

 striate ; longitudinal striae conspicuous ; terminal and central no- 

 dules more or less distinct. [PI. 2, f. 9, upper valve ? growing on 

 Ptilota asplenioides on the coast of Kamtschatka.] 



? Var. Transverse stria? obsolete ; transverse stria? even on the 

 marginal part of the valve, conspicuous. [PI. 2, f. 22, upper valve 

 with the preceding.] 



(The large size of the valve and the peculiar striation renders it 

 difficult to imagine that this form is the upper valve of the forego- 

 ing species. The so-called longitudinal strife resemble the furrows 

 on C. pellucida. [Fig. 7 a, and f. 8. F. K.] 



Cocconeis pacifica, Grun., n. sp. — Lower valve with a distinct 

 border of conspicuous granules, interior of valve hyaline and finely 

 striate, median line straight, central nodule dilated into a transverse 



