Marine Diatoms 17F 
Hyalodiscus scoticus (Kiitz.) Grun. 
_ Wan Heurck Syn., Pl. 84, figs. 15-18; Sch. Diat. Nordsee, Pl. 3, fig. 27, 
misnamed. . 
Found at Stations 20b-c, 20g, 41, 48b and 48c, abundant. 
Hyalodiscus subtilis Bail. 
Bail. New Spec., Pl. 1, fig. 12; Prit. Inf., Pl. 5, fig. 60, good figure. 
Found at Stations 42b and 48a, scarce in both. 
Licmophora Ag. 
Licmophora Lyngbyei (Kitz.) Grun. 
Van Heurck Syn., Pl. 47, fig. 15. 
The specimens were all the unimportant variety called var. Pappeana 
Grun. in the above reference. Although the markings are coarse they are shallow 
and therefore obscure. Found in plankton haul made at Station 43f. 
Licmophora tenuis (Kiitz.) Grun. 
Van Heurck Syn., Pl. 48, fig. 21; W. Sm. Brit. Diat., Pl. 24, fig. 229, mis- 
named. , 
Found in plankton haul made at Station 50b. 
Mastogloia Thwaites. 
Mastogloia Braunii Grun. 
Van Heurck Syn., Pl. 4, figs. 21-24. 
Found only at Station 20b-c and there scarce. 
Mastogloia Grevillei W. Sm. 
Van Heurck Syn., Pl. 4, fig. 20 (compare fig. 18). 
M. Grevillei is a fresh-water species; this and the similarity or identity 
which some forms show with M. Danseit Thw., a brackish and marine species, 
suggests the specimens found may belong to the latter. In a plankton haul 
from Station 21d-f. " 
Melosira Ag. 
Melosira granulata (Ehr.) Ralfs. 
Sch. Atlas, Pl. 181, figs. 57-65. 
Rather plentiful at Station 29g. 
Melosira Heribaudii Brun. 
Sch. Atlas, Pl. 182, fig. 23. 
Very abundant in dredging from Station 43). 
Melosira hyperborea Grun. 
Van Heurck Syn., Pl. 85, figs. 83-4; Gran Nord Plankt., p. 18, fig. 4. 
Found in three plankton hauls, from Stations 12b-c, 20a and 40d. 
Melosira Jurgensii Ag. 
Sch. Atlas, Pl. 182, figs. 16, 27-31. 
Found at Stations 20b-c, 41, 48a and 43c. 
Melosira nummuloides (Bory) Ag. 
Sch. Atlas, Pl. 182, figs. 1-2; Van Heurck Syn., Pl. 85, fig. 1. 
Found in one dredging, from Station 43c, and in three plankton hauls, 
Stations 20a, 40d and 46b. 
Melosira sulcata (Ehr.) Kiitz. 
Van Heurck Syn., Pl. 91, figs. 15-18, 22-24. : 
Placed by many authors in a separate genus, Paralia. Found at Stations 
20b-c; 20g, 23 and 48a. 
3097-2 
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