No formal description. Refers to Martini, 1773: Pl. 49 fig. 537 (A); Knorr, 1757: Pl. 15 fig. 7 (B).
A.
B.
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith