618 
Proceedings of Royal Society of Edinburgh. [sess. 
Markings polygonal, 7 in ’01 mm., decreasing 
outwards ; rows fasciculate beyond semi- 
radius, oblique rows concave outwards, . 
Markings 8 in ’01 mm., decreasing slightly 
78. towards border ; rows radial, on outermost 
portion of valve parallel, subfasciculate 
secondary rows obscure, slightly concave out- 
wards, ........ 
(.Markings otherwise, 
( A distinct irregularly broad band adjacent to 
mq J border. Markings 12 in '01 mm., irregular 
* 1 on a small central area, 
I No such irregular marginal band, 
f Markings round, granular, and without order, 
with hyaline interspaces to about semiradius, 
80. ■{ thence more crowded in rows and subequal, 
10 in *01 mm. ; rows subfasciculate to border, 
L Markings not so disposed, .... 
( Markings round, granular, subequal, 7 to 8 in 
*01 mm., irregular on a small indistinctly 
defined central area, elsewhere in radial sub- 
parallel and irregularly subfasciculate rows ; 
81. ■{ secondary concentric bands faint, . 
Markings 3^ to 4 in *01 mm., angular; radial 
rows faint, secondary concentric bands 
evident, ....... 
No concentric arrangement visible, . 
"Markings punctiform, 12 to 15 in '01 mm. 
Apiculi large, distant. A distinct band at 
border, with evident oblique decussating rows, 
Markings round, granular about 4 in '01 mm., 
82. -J beyond semiradius subfasciculate, interspaces 
wide, 
Markings polygonal, 8 to 10 in '01 mm. A 
circlet of numerous apiculi a short distance 
within border. Border distinct, striae evident, 
f Markings consisting of a few wavy lines diverg- 
10 J ing outwards from central space, and confined 
' j to central half of valve, . . 
I No such markings, ...... 
f Markings round, granular, 6 in '01 mm., smaller 
towards border, radial rows obscure, short 
transverse somewhat flexuous rows more 
evident, non-decussating except near border, . 
Markings small, round, granular, interspaces 
| unequal, radial rows obscure, radial hyaline 
lines at regular intervals extending from 
centre, a distinct apiculus at outer end of 
each, . . . . . . . 
Markings round, granular, without order to 
semiradius, beyond this punctiform in radial 
rows ; radial clear spaces at subregular 
intervals, extending outwards from semi- 
radius, 
Markings obtusely angular or oval, 5J to 6, at 
border 8, in ‘01 mm. ; rows radial, towards 
border uniformly curved towards same 
direction, with hyaline curved lines extending 
inwards a short distance at subregular 
intervals, ....... 
suspedus. 
subglobosus. 
79. 
subsalsus. 
80. 
atlanticus. 
81. 
subnotabilis. 
isoporus. 
82. 
doljensis. 
nitidulus. 
corolla. * 
venulosus. 
83. 
densus. 
splendidulus. 
apages. 
obliquus. 
