94 NOVARA DIATOMS. 



Lower (?) valve median line more or less arcuate, central nodule 

 small, oblong, terminal, nodule approaching the apices, stri as punc- 

 tate, delicate (50 to 54 in. "001), radiant furrows double, marginal 

 one more or less approximate. PL 6, fig. 12. 



In sand, from the roots of Eck Ionia buccinalis, from St. Paul, in 

 the South Sea. 



A diminutive species. I am not certain whether the form des- 

 cribed as the lower valve belongs to it. They occur commonly 

 enough in the cleaned material of the same form, size, and quan- 

 tity as the characteristic upper valve, so that they belong to each 

 other is very probable. It is distinguished from C. scutellum in 

 the costee of the upper valve, and from the small form of Campy- 

 loneis Grevillei in the number of narrow costaa and delicate puncta. 

 Cocconeis costata, Greg, has also much stronger costse, and a broad 

 lanceolate median space. 



(I do not observe in the author's figures any resemblance to the 

 Surirellje, none at least to warrant his specific name. F. K ) 



(Berkeleya Harveyi, of this form we have no additional descrip- 

 tion. The fig. (pi. 6, fig. 13) is apparently given to show the 

 resemblance of the median line to Ampliipleura Frauenfeldiana, 

 and the transverse stride. F. K.) 



(An uncorrected printer's error occurs in the otherwise very 

 correct text of the original paper ; this would hardly have called 

 for notice had it not been repeated in the catalogue of forms sent with 

 Moller's Typen Platte, and repeated again in his printed catalogue, 

 viz., Craspepodiscus, for Craspedodiscus. A similar repetition of 

 a printer's error occurs in the very imperfect index to the diato- 

 macese, figured in Qua. Mic. Jour., by C. J. Muller, Esq., vol. x., 

 N.S. In the description of figures in Greville's paper, vol. xiv., 

 page 79, Croispedodiscus is printed for Craspedodiscus, and the 

 error has been repeated by the author of the index. F. K.) 



CONTENTS OF PLATE VI. 



Tig. 1. — Navicula gemmata, var. biseriata. 



Fig. 2. — Entopyla ornata. a frustule, b portion of valve more enlarged. 



Fig. 3. — Ampliipleura Frauenfeldiana. (Central nodule.) 



Fig. 4. — a. b. Coscinodiscus ellipticus. 



Fig. 5. — Pleurosigma validum ; var. nicobaricum. a, valve ; b, portion of ditto 

 more enlarged. 



Fig. 6. — Ithmia nervosa, var. nankoorensis. a, frustule, b, portion more en- 

 larged. 



Fig. 7. — Plagiogramma spectabile, var. quadrigibbum. 



Fig. 8. — Stictodiscus califomicus, var. nankoorensis. 



Fig. 9. — Aster omphalus nanlcoorensis. 



Fig. 10.— Climacodium Frauenfeldianum. 



Fig. 11. — Cocconeis surirelloides, upp^r valve. 



Fig. 12. — „ „ lower valve. 



Fig. 13. — Berkeleya Harveyi. 



Fig. 6 X 200 diameters ; fig. 10 X 100 diameters ; fig. 11 X 1000 diameters ; 



all the others (with the exception of 3 and 13, of which no amplification is given), 



are X 500 diameters. 



