620 
Proceedings of Royal Society of Edinburgh. 
92 I •^ e ^ ca ^ e puncta at origin of shorter rows, . 
’ \ No such puncta, ...... 
fPuncta at origin of shorter rows sometimes 
visible. A distinct band of large markings 
qo j round central space. Markings towards 
' j centre 4 to 4|, towards border 6 to 7, in *01 mm. 
j Apiculi near border in a circlet, minute, 
l No such band nor apiculi, . . 
qn f Distinct apiculi at angles of areolse, . 
‘ \ No such apiculi, 
f An evident rosette. Markings towards centre 
2|, increasing outwards for a short distance, 
gg J at border 5 in -01 mm., submoniliform, 
’ j obscurely punctate ; central papillae faint. 
| Rows radial, ....... 
I No rosette, 
97. 
f A distinct band of large round markings around 
central space. Markings towards centre 5, 
J increasing slightly for ■£■ of radius, towards 
j border 3^ in - 01 mm., subpearly. Central 
papillae faint, 
I No such distinct band, . 
98. 
f Markings rounded or angular, 3| to 4 in’Ol mm. 
Central dots distinct ; central space small, 
Markings robust, rounded on one side of valve, 
hexagonal on the other ; towards the centre 4, 
at f of radius 2, at border 6, in ’01 mm. ; 
decrease to border rapid. Central papillae pro- 
minent ; rows radial, ..... 
Markings towards centre 4|, at semiradius 3J, at 
border 5 or 6, in ’01 mm. Central space 
rounded ; no distinct central papillae or dots, . 
Markings towards centre 2J, at -£ of radius 2, at 
border 4 to 5, in ’01 mm. , subpearly. Central 
papillae faint. Central space minute or sub- 
^ obsolete, ....... 
f Markings unequal and irregular. Central space 
94. -J irregular, . ...... 
V. No such irregular markings, . . . . 
f An elevated band at semiradius ; markings 
inside this and towards border moniliform 6, 
on the elevated band 4, in *01 mm. , 
Highest zone reaching inwards to about £ of 
99. -{ radius, most abrupt on inner edge. Markings 
towards centre 8, on highest zone 4, beyond 
this 6, in - 01 mm. Subequal subulate spaces 
opposite shorter rows, ..... 
I No such sharp elevated band, .... 
f Markings of 2 kinds — the larger distant, rounded, 
| in inconspicuous radial rows — the smaller 
Iqq j closer, punctiform, in evident radial rows ; 
* j hyaline spaces opposite shorter rows, 
I Markings not of such distinct kinds — rounded, . 
L Markings not of such distinct kinds— angular, . 
93. 
94. 
oamaruensis. 
95. 
fioridulus. 
96. 
moravicus. 
97. 
Monicas. 
98. 
perforatus. 
Kurzii. 
conformis. 
obscurus. 
anastomosans. 
99. 
grayianus. 
spiniferus. 
100 . 
diplostictus. 
101 . 
102 . 
