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NUMBER 557 137<br />
PLATE 29.—Tropidocyathus lessoni: a,b, lateral and calicular views of a specimen from TM (KT9202, YT2),<br />
USNM 92779, x 4.6, x 4.9, respectively. Stenocyathus vermiformis (r. 27°24'N, 79°26'W, USNM 46646; /,<br />
Pillsbury-96\, USNM 46649): c,f. lateral and calicluar views of western Atlantic specimens, x 3.1, x 20,<br />
respectively. Tropidocyathus pileus: d,e, lateral and caliclular views of a specimen from TM (KT9015, BS2),<br />
USNM 92781, x 3.5, x 3.9, respectively. Alatotrochus rubescens {g.jjc. TM (KT9015, BS2), USNM 92776; h j.1,<br />
syntype, Challenger-\92, BM 1880.11.25.163): f>,k. lateral and calicular views of a specimen, x 3.2, x 3.5,<br />
respectively; h,i,l, oblique basal, calicular, and oblique calicular views of a paratype, all x 2.6; j, lateral view of<br />
a specimen showing the distinctive costal development, x 3.5.