594 
Proceedings of Royal Society of Edinburgh. [sess. 
This approaches C. granulatus, but is distinguished by its convex 
surface and more minute markings. From 0. dubiosus it is dis- 
tinguished by the absence of subulate spaces and of clear scattered 
puncta. According to Mr E. Grove probably C. radiosus , Grun. 
Habitat — Arctic regions (Sutherland); shell cleanings, West 
Indies (Bright well); ex Ascidiis , Koundstone Bay, Co. Galway; ex 
Ascidiis , Co. Clare (O’Meara). 
C. granulatus. Ehrb., Mon. Ber. Ah., 1845, p. 75. — Diam. 
*049 mm. Markings minute, granular, equal, 9 to 10 in -01 mm.; 
rows crowded. — Rails in Pritch. Inf., p. 830. 
The appearance of the centre of this unfigured species is un- 
known. 
Habitat. — Stratford Cliff and Holies Cliff, Ya. (Ehrenberg). 
C. punctulatus. Greg., Trans. Roy. Soc. Edin., 1857, p. 500 
pi. x. fig. 46. — Diam. *045 to '085 mm. Central space and 
rosette absent. Markings faint, minute, punctiform, forming 
delicate radiating lines, less distinct towards the centre than the 
oblique decussating lines ; at wide irregular intervals scattered clear 
but faint round dots. Border sharply defined; striae faint, 20 to 22 
in ’01 mm. — Greg., Trans. Micr. Soc. Lond ., 1857, p. 83, pi. i. 
fig. 48. Ralfs in Pritch. Inf. , p. 831; H. L. Smith, Diat. Sp. Typ., 
No. 96. 
The fine radiating lines recall those of G. stellaris, Roper. 
Gregory regarded the valves as probably belonging to Melosira or 
Orthosira. O’Meara ( Proc . Roy. Ir. Ac., 1875, p. 265) has probably 
not seen the true species. 
Habitat . — Jamaica (Greville !) ; Cumberland inlet, lat. 66° N. 
(Arnott !) ; Lamlash Bay and Loch Fyne (Gregory !) ; locality (?) 
(Rae!); Ascidia, Co. Clare (O’Meara). 
C. radiopunctatus. Harting, Verli. Kon. Ah. Wetensch. Amster- 
dam, 1864, No. 2, p. 8, pi. i. fig. 3. — Diam.? At the centre a 
minute stellette of small dark puncta. Markings small, round, 
granular, subequal ; rows radial, inconspicuous, secondary irregularly 
concentric bands manifest. Border with short delicate striae. 
Harting compares the markings to those of C. profundus, Ehrb. 
( Mihrog ., pi. xxxv. B. fig. 8), but they are smaller. In the latter, 
