520 Proceedings of Royal Society of Edinburgh. [sess. 
Distinguished from C. radiatus by the more convex surface and 
the evident punctation of the markings. 
Habitat. — Church Hill, Richmond (Grunow) ; Dolje deposit 
(Pantocsek !). 
C. subangidatus. Grun., Denk. Wien. Ak. } 1884, p. 73. — Outline 
irregular, obtusely angular. Diam. *06 mm. Surface very convex 
at the border. Markings polygonal; towards the centre 3, at the 
border 4 to 4J in *01 mm., distinctly punctate. Border striae 
evident, radial or oblique, 4 to 5 in *01 mm., its inner edge 
indistinct. 
Habitat. — Moron deposit (Grunow, Greville !). 
C. nodulifer , Janisch. Sch., Atl., pi. lix. figs. 21-23. — Diam. *065 
to *1 mm. Central space and rosette absent, but one (rarely a few) 
evident nodules present. Markings angular, 3J to 4 in *01 mm., 
decreasing slightly around the border ; radial rows inconspicuous, 
the oblique decussating rows more distinct. Border sharply defined ; 
striae evident 4 to 6 in ’01 mm. — Cleve and Moll., Diat ., No. 57, 
155 ; Janisch, Gazelle Exped ., taf. ii. figs. 4-5. 
Habitat. — Richmond, Va. Balearic Islands (Cleve and Moller !) 
Sta Monica deposit (Grove !) ; California, Gazelle Exped. 
(Schmidt) ; Islay, Peru (Kitton !) ; Isle of Muntok, near Sumatra 
(Grove !) ; Macassar Straits (Grove !) ; Indian Ocean sounding, 
Capt. Pullen, 2200 fathoms (Greville !) ; coral washings, locality % 
(Doeg !) ; Atlantic Ocean, lat. 3° 3' N., long. 15° W. (O’Meara!); 
off Ascension Island, S.S. Buccaneer (Rattray ! Grove !) ; Galapagos 
Island (Cleve!) Patagonian guano; between Aden and Bab-el-Mandeb 
(Cleve !). 
Yar. apiculata , nov. C. nodulifer (Janisch), Sch., Atl., pi. lix. 
fig. 20. — Diam. *0685 to *15 mm. Central nodule single, larger. 
Markings decreasing more around the border; apiculi numerous, 
subregular, placed at inner side of border. 
Habitat. — Campeachy Bay (Schmidt) ; trawled at lat. 12° 42' N., 
long. 152° r W., in 2900 fathoms, by H.M.S. Challenger (Rae !). 
C. radiosus, Grun. Van Heurck, Syn. Diat. Belg. } .pi. cxxxii. 
fig. 7 — Diam *09 to *11 mm. Surface almost flat, or somewhat 
convex towards the centre. Central space absent. Markings poly- 
