1888-89.] Mr John Rattray on the Genus Coscinodiscus. 495 
pi. ii, (C), fig. 26; Raben., Alg. Europ., Nos. 2142, 2187, 2558; 
Van Heurck, Syn. Diat. Belg ., p. 218, pi. cxxxi. fig. 1 ; Typ. Syn. 
Diat. Belg., Nos. 519, 520, 532, 533; Cleve and Moll., Diat, 
Nos. 57, 125, 162, 164, 207, 211, 257, 258, 319; H. L. Smith, 
Diat. Spec. Typ., No. 100 ; C. subtilis % Sch., Atl., pi. lvii. fig. 12 
(excl. C. radiolatush= G. subtilis, Ehrb., Mikrog, pi. xxii. fig. 4). 
According to Ehrenberg’s original definition, there should he 12 
markings in *01 mm. Fasciculi were hardly indicated in his 
figures, several of which approach his C. intermedins. There is no 
close affinity to C. punctatus, Ehrb., as he at one time believed 
(Mon. Ber. Ak., 1844, pp. 186, 188-191). The species approaches 
C. Normani, Greg., but in the latter the markings are less regular, 
the fasciculi at the border consist of about 6 rows instead of 12, 
and the lines between the fasciculi are less distinct. Janisch 
erroneously describes the markings as round. Schmidt, in 1874, 
erroneously refers to the fasciculi as branched towards the same 
side by a bent ray. Specimens are sometimes confounded with 
C. odontophorus, Grun., and G. Rothii, Grun., and are distinguished 
from C. symmetricus , Grev., and C. denarius, Sch., only by their 
smaller markings, to which transitional forms occur, Grunow 
having observed forms from Monterey and Australia with 5J to 7 
markings in - 01 mm. 
Habitat. — Stratford (Ehrenberg) ; Richmond, Ya. (Erhenberg, 
Rae ! Cleve and Mo Her !) ; Caltanisetta (Ehrenberg) ; Moron 
deposit (Schmidt) ; Peruvian guano (Janisch, Schmidt) ; Angamos 
guano (Janisch) ; Bolivian guano (Grunow) ; Patos guano (Greville!); 
Assistance Bay, San Francisco (Ehrenberg); lat. 71° 19' N., long. 11° 
28' W., 129 fms., in yellowish-grey mud ; lat. 73° 16' N., long. 
15° 48' W., 1300 fms., in dark greyish-brown mud ; lat. 63° 40' N., 
long. 5° 28' E., 569 fms., in light grey fine mud; lat. 74° 11' N., 
long. 15° 19' W., 224 fms., in fine greyish-brown mud; lat. 74° 
33' N., long. 18° 39' W., 90 fms., in coarse sandy mud (Ehrenberg) ;* 
pancake ice, Antarctic Ice Barrier, lat. 78° 10' S., long. 162° W.; 
melted ice, lat. 75° S., long. 170° W.; snow and ice, near Vancouver 
Island, lat. 70° S., long. 165° W.; floating ice, lat. 64° S., 
long. 160° W.; Gulf of Erebus and Terror, lat. 63° 40' S., 
long. 55° W., 207 fms.; ex Salpd, lat. 66° S., long. 157° W. 
* Specimens procured by the second German North Polar Expedition. 
