462 
Proceedings of Royal Society of Edinburgh. [sess. 
sating rows distinctly concave outwards ; apiculi distinct, numerous 
at subequal distances apart, sometimes absent. — Ehrb., ibid., 1841, 
p. 323, 371, pi. iii. 7, fig. 5; Mikrog ., pi. xviii. fig. 32, pi. xxi. 
fig. 6 ; W. Sm., Syn. Brit. Diat ., i. p. 23, pi. iii. fig. 38 ; Sch., 
Jahresb. d. Kom. z. Untersuch. d. deutsch. Meer , Kiel, 1874., ii. p. 
94, pi. iii. figs. 36-38 ; Atl., pi. lviii. figs. 46 to 49 ; Van Heurck, 
Syn. Diat. Belg ., p. 217, pi. cxxx. figs. 4, 7, 8 ; Janisch,* 
Gazelle Exped ., taf. ii. fig. 3; vi. figs. 3, 7-11 ; H. L. Sm., Diat. 
Sp. Typ., No. 93; Coll. Kiitz. Diat., No. 285; Van Heurck, Typ. 
Syn. Diat. Belg., Nos. 529, 530 ; Cleve and Moller, Diat., Nos. 
148, 150, 183, 207, 210, 211, 215, 228, 257, 258, 276. Odonto- 
discus excentricus. Ehrb., Mon. Ber. Ak., 1845, p. 79; Sch., 
ibid., 1874, ii. p. 94; Eaben., Algen. Europas, No. 2149, 2263, 
2437, 2483, 2484, 2485, 2486, 2487, 2558 ; C. lineatus, var., 
Habir., Cat. Diat.-, § Coscinodiscus, C. minor, Sch., Atl., pi. cxiii. 
fig, 9. 
In Ehrenberg’s early figures apiculi are not .indicated ; these are 
first noted by W. Smith. Janisch ( Abh . Sch. Ges. vdter. Cult,., 
1862, p. 4), erroneously states that the markings are round. Dis- 
tinguished from C. sol, Wallich, by the presence on the latter of 
a wide slightly siliceous broad external zone. 
Habitat. — Chalk marl, Oran, Richmond and Petersburg, Ya.; lat. 
71° 19' N., long. 11° 28' W., 1319 fms., in fine yellowish-grey mud ; 
lat. 63° 40' N., long. 5° 28' E., 569 fms., in fine light mud ; Cuxhaven, 
North Sea; Tjorn, Cattegat, Vera Cruz (Ehernberg) ; Barbados 
(Cleve and Moller !) ; Bohuslan, Hvidingsoe (Schmidt) ; Poole Bay, 
near Lewes, and stomach of scallop (W. Smith) ; Blankenberge, 
Antwerp (Van Heurck) ; San Benito deposit, California (Grove !); 
Eirth of Forth (Rattray!); Porto Seguro (Hardman !);f San Francisco 
* To the specimens figured in Janisch ’s Gazelle Expedition plates, which, 
though still unpublished, have had considerable private circulation, the 
following names have, according to Herr E. Weissflog, been given by Janisch, 
namely: — PI. I. figs. 1-5, Stoschia admirabilis, C. Jan., gen. et sp. n. PI. II. 
fig. 1, Coscinodiscus gigas ? var. ; figs. 4, 5, C. nodulifer, A.S. sp. n. PI. III. 
fig. 2, C. africanus, C. Jan., sp. n.; fig. 4, C. praetextus, C, Jan., sp. n. ; fig. 
6, C. tumidus, C. Jan., sp. n. PL IY. figs. 1, 2, C. lentiginosus, C. Jan., sp. n. ; 
figs. 3, 5, C. arafuraensis. PI. Y. figs. 2, 3, C. gyratus, C. Jan., sp. n. ; fig. 
6, C. atlanticus , Grun. ; fig. 7, C. lentiginosus, C. Jan., sp. n. PI. YI. fig. 12, 
C. bullatus, C. Jan., sp. n. ; fig. 13, C. nobilis, Grun. 
t In the collection of Julien Deby. 
