KOXOL. SV. VET. AKADEMIENS HANDLINGAR. BAND 27. N:0 3. 167 



C. Grevillei was described 1853 by W. Smith as Cocconeis, but in 1862 (Verb. p. 115) 

 Grunow placed it in Campyloneis, a new genus which he formed for the reception of an allied 

 form, C. Argus, now considered as a variety of C. Grevillei. The most striking feature in Campy- 

 loneis is the interior silicious skeleton, which is frequently found isolated from the valves. This 

 skeleton, which varies greatly in its form, is in the entire frustule attached by some vertical 

 processes to the lower valve. It is evidently analogous to the annulus of several Cocconeis-torms 

 and to the loculiferous plate of Mastogloia. 



Campyloneis lives attached to marine algffi and occurs in temperate and tropical seas, 

 where it is plentiful, and occurs in a great variety of forms, which are all closely connected, how- 

 ever different they may appear. 



1. C. Grevillei W. Sm. (1853). — V. broadly elliptical, with rounded ends. L. 0,02 to 

 0,01; B. 0,017 to 0,09 mm. Upper V. with or without a depressed axial part, with transverse 

 rows of puncta or alveoli. Lower valve with straight median line, not reaching to the margin; 

 its central pores approximate. Striation much iiner than on the upper valve. 



This most variable species comprises a number of forms, which may be distributed in the 

 following varieties: 



Var. Argus G-run. (1862). — L. 0,03 to 0,05; B. 0,025 to 0,05 mm. Upper valve with a 

 more or less distinct, narrow axial area. Transverse rows of puncta about 6 in 0,oi mm. Longi- 

 tudinal rows 5 to 6 in 0,oi mm. Lower V. with 14 striae and 18 puncta in 0,oi mm. Interior 

 skeleton of distinct transverse ribs, united to an axial rib. — Campyl. Argus Grun. Verh. 1862 

 p. 429 PL VII f 9, 10. No vara p. 10. V. H. Syn. PI. XXVIII f 16. Bhaphoneis suborbicularis 

 O'Meara M. J. (n. s.) VII PI. VII? 



Marine: English Channel! Galway (Grove Coll.)! Iceland (Grun.)! Island of Ehea (Singapore)! 



Var. typica Cl. — L. 0,o3 to 0,o6; B. 0,025 to 0,o4 mm. Upper V. with a depressed, lanceo- 

 late area. Strise 6 in O.oi mm., outside of the area composed of distinct puncta, inside of short 

 ribs, formed of fused puncta. Lower V. as in Var. Argus. Striae about 18 in 0,oi mm. Skeleton 

 of transverse ribs connected by an axial and, usually, by several lateral ribs. — Coccon. Grev. 

 W. Sm. B. D. I p. 22 PI. Ill f. 35. Campyl. Grev. Grun. Novara p. 11 1867. Petit D. de Camp- 

 bell PI. IV f. 5. V. H. Syn. PL XXVIII f. 10, 11. Camp. Grev. var. obliqua Grun. Nov. p. 11 

 PL I f. '5 (small form). Coccon. villosa Perag. D. de Villefranche PL IV f. 35 (lower valve)? 



Marine: S:t Pauls Island (Grun.), New Zealand! Sandwich Islands! Japan! Ceylon! Gala- 

 pagos Islands! Monterey! West Indies! Eng. Channel (W. Sm.). 



Var. microsticta Grun. (1881). — L. 0,o4 to 0,05; B. 0,0.32 to 0,035 mm. Upper valve as 

 in Var. Argus, skeleton as in Var. typica. Strise 7 in 0,oi mm. — V. H. Syn. PL XXVIII f. 8, 9. 



Marine: King Georges Sound! 



Var. regalis Grev. (1859). — Almost orbicular. L. 0,o7 to 0,i; B. 0,o5 to 0,09 mm. Upper 

 valve with depressed lanceolate area, the interior part of which forms a structureless, more or less 

 narrow space. Alveoli rectangular, inside finely punctate, forming radiate rows, about 4 in 0,oi 

 mm., on the depressed area, at least at its marginal part, prolonged. Lower V. as in the other 

 varieties, but more coarsely striate, striae 8 in 0,oi mm. Puncta of the strise 8 in 0,oi mm. In- 

 terior skeleton very complicated, having at the margin radiate costae IV2 to 2 in 0,oi mm., which 

 send off numerous short lateral branches. — Cocconeis regalis Grev. M. J. VII p. 156 PL VII f. 1. 

 V. H. Syn. XXVIII f. 13, 14 (small form). 



Marine: Japan! Californian guano (Grev.), S:ta Monica, fossil! 



The varieties of Camp. Grevillei are exceedingly variable. The interior skeleton especially 

 is subject to great variations. Cocconeis radiata Greg. (T. M. S. V p. 68 PL IV f. 26; 1857) is 

 probably the interior skeleton of C. Grevillei. In the deposit of Oamaru occur very complicated 

 skeletons of a form akin to the var. regalis. A similar skeleton is named by Brun Cocconeis 



