KONGL. SV, VET. AKAI)KMIEN« lIANDLINCi AK. BAM) 27. N:() 3. 187 



mm. Intercostal spaces finely punctate (puncta about 23 in 0,01 mm.), fre<{UPntly appai-cntly 

 smooth. Lower V. with straight median line, very narrow axial area. Central area transvci-.sely 

 dilated. Stritu in the middle 18, at the ends much closer, about 27 in 0,01 mm. — lihaphoneis 

 Lorvnziana Grun. Verb. p. 381. lihaph. fluminensis Grun. 1. c. PI IV f. 5. V. H. Syn. PI. XXXVl 

 f. 34. C. rohusta Leud. Forth. D. de Ceylon I f. 1? Achn. danica Pant. 11 PI. IV f. ()6? Ithuplio- 

 nds Scutdliim Petit D. de Ningpo PI. Ill f. 6? 



Marine: Barcelona, Balearic Islands! Adriatic (Grun.), Bab el Mandeb! Macassar Straits 

 (Grove Coll.)! 



This species is in the index to the plates in Grunow's monograph erroneously named li. flu- 

 iniDcnsis. I have seen an entire frustule in Grove's collection, but the coarse structure of the 

 upper valve made the examination of the lower very difficult. It is doubtless no liltaphoneis, but 

 a species nearly akin to A. danica. 



8. A. iiiaminiilis Castr. (1886). — Elliptical, apiculate. L. 0,o4.-i to 0,()6.s; B. 0,02 to 0,o38 

 mm. Upper V. with narrow, linear axial area and sliglitly radiate costfe (6 in (),o 1 mm.) alter- 

 nating with double rows of small puncta, 11 to 14 in 0,oi mm. Lower V. with very narrow axial 

 area. Central area transverse, widening outward, and laciniate. Strife 21 (middle) to 25 (ends) in 

 0,01 mm. in the middle alternately longer and shorter, finely punctate. — Bliaphoncis mamnialis 

 Castr. D. Voy. Chall. p. 48 PI. XXVI f. 3 (upper valve). Sfauromis tuMtiana Castr. 1. c. PI. XX 

 f. 16 (lower valve)? Stauroneis apiculata Greg. Ed. N. Phil. J. X (n. s.) 1859 p. 30 PI. IV f. 8 

 (lower valve)? Stauroneis? ohcsa Grev. T. Bot. Soc. V. VIII p. 237 PL III f. 12 (lower valve)? 

 A. mammalis Icon. n. PI. Ill f. 13, 14, 15. 



Marine: Galapagos Islands! Macassar Straits (Grove Coll.)! 



Var. reticulata Cl. — Upper V. without rows of puncta between the costtV, but connected 

 by longitudinal costse, forming an irregular reticulum. — PI. Ill f. 16. 



Marine: Macassar Straits (Grove Coll.)! Galapagos Islands! 



Of the var. reticulata I have seen, besides upper valves, an entire frustule, with distinct 

 median line and transverse central area, but the coarse structure of the upper valve pz'evented 

 the exact examination of the lower valve, which however seems to have the same structure as 

 the type, although that of the upper valves is so different. The outline of both forms is exactly 

 the same. 



9. A. baldjikii Btw. (1859). — Rhomboid. L. O.045; B. O.os mm. Upper V. with linear 

 axial area and strong radiate costae (7 in 0,oi mm.) without intercostal puncta, and in the middle 

 alternately longer and shorter. Lower V. without axial area, central area small rounded. Strict 

 10 to 11 in 0,01 mm., strongly radiate throughout, punctate, in the middle alternately longer and 

 shorter. — Odontidium Bald. Btw. M. J. VII p. 180 PI. IX f. 10. Rhaplioncis Bald. Grun. Verb. 

 1862 p. 379. Achn. bald. Grun. A. D. p. 21. Pant. Ill PI. XIII f. 204. Icon. n. PL III f. 4, 5. 

 A. bald. var. sidiquadrata Pant. Ill PL XIII f. 202. Dimercgranima baldj. Walker and Chase 

 N. R. D. PL I f. 3; 1886. 



Marine: Baldjik near Varna, fossil! 



Microneis Cl. N. G. 



Valves small, linear to lanceolate, not very dissimilar. Upper valve with fine, parallel 

 strise and central, straight, narrow axial area. Lower valve with fine, almost parallel strire. No 

 marginal rim. Frustule genuflexed. 



This group comprises a number of usually very small diatoms, partly stipitate, partly free 

 and fre(|uently genufiexed. Most of them inhabit fresh water, hot springs and brackish water. 

 As to their affinities, they seem to be most nearly akin to the Naricnlre minusculcH and Naviculce 

 mesoleice. 



