572 Proceedings of Royal Society of Edinburgh. [sess. 
border minute apiculi at intervals of about *005 mm. Grunow 
(Denk. Wien. Ah ., 1884, p. 76), says that 0. Woodivardii , Eul., 
is identical with the present species. In Kitton’s specimens of 
Eulenstein’s valves, however, which I have examined, there are no 
puncta at the inner ends of the shorter rows. These valves are, 
indeed, identical with G. apiculatus, var. ambigua , Grun., which 
must be abandoned. Kitton’s slide was obtained from Herr E. 
Weissflog, who purchased Eulenstein’s collection at his death, and 
therefore knew his C. Woodwardii. 
Schmidt’s figure (. Atl ., pi. lx. fig. 12) resembles C. centralis 
much more than C. perforatus, in its more prominent central 
rosette, more crowded markings, and the more rapid diminution of 
their size towards the border. Its union to C. perforatus is doubt- 
ful ; it is based only on the presence of minute puncta, opposite the 
origin of the shorter rows. 
Habitat. — Richmond, Va.; Arica and Peruvian guano (Schmidt, 
Kinker ! Cleve !) ; Thames mud (Roper) ; Medway (Dallas) ; New 
Nottingham (Firth !) ; Callao seaweeds (Firth !) ; Saldanha Bay 
guano (Cleve !). 
Var. cellulosa. Grun., Denk. Wien , Ak., 1884, p. 75. — Diam. 
T35 to T5 mm. Markings hexagonal, 3 to 5 in *01 mm., smaller 
at the border ; the puncta at the origin of the shorter rows indis- 
tinct; minute apiculi at intervals of about *005 mm., sometimes 
present. — Sch., Atl., pi. cxiv. fig. 5 ; in H. L. Sm., Diat. Spec. 
Typ., No. 90 ; Janisch, Gazelle Exped ., taf. iv. figs. 6, 7. 
Habitat. — With the species and on Macrocystis from the coast 
of Peru (Grunow) ; Callao seaweeds (Firth !) ; Japan (Kinker !) ; 
Maryland deposit (Rae !) ; Bermuda tripoli (Greville !) ; Nottingham, 
Maryland (O’Meara !) ; Oamaru deposit, Jackson’s Paddock 
(Grove !) ; Chincha guano (Grove ! Schmidt) ; Lobos di Afuera 
guano (Grove !) ; Japan (H. L. Smith !) ; Bolivian guano (Cleve !) ; 
San Benito deposit, California (Grove !). 
Yar. delicatula, nov. C. perforatus , var. cellulosa , Grun., ibid., 
1884, p. 75. — Central space minute. Markings towards the centre 5, 
towards the border 8, in *01 mm.; puncta at the origin of the 
shorter rows small. 
This var. approaches C. fimbriatus. 
Habitat. — Moron deposit (Grunow). 
