Figure 131
Extinct Acanthodesmidae.
I) Trissocyclus mutuaria (Goll), surface layer of the sediment, Pacific Ocean, “Vityaz”, station 5124; II) Trissocyclus sp. a, Lower Miocene, JYN 20P; III) Trissocyclus sp. m, Lower Miocene, JYN 20P; IV-VI) Trissocyclus sp. I, Miocene: IV) JYN 20P; V, VI) AMPH 6P (specimens with pores of various sizes); VII-VIII) species similar to Tympanidium binoctonum Hck.,: VII) surface layer of the sediment, Pacific Ocean, “Vityaz”, station 5124; VIII) Middle Miocene, AMPH 6P; IX) Trissocyclus sp., similar to the species described as Liriospyris elevata Goll, Middle Miocene, AMPH P6; X, XI) Zygostephanium cf. Elevata (Goll) surface layer of the Pacific Ocean, “Vityaz”, station 5124 (2 specimens with shells of different shapes); XII-XIII) Zygostephanium sp., Middle Miocene, AMPH 6P (2 specimens with differently developed frontal belts); XIV) form similar to Circospyris nucula Hck., Middle Miocene, AMPH 6P; XV) close form from the same sample; XVI, XVII) Pylospyris (?) sp. similar to Liriospyris ovalis Goll, one and the same specimen, Miocene, JYN 20P; XVIII, XIX) 2 specimens resembling Lithotympanium tuberosum Hck., defined by Goll as Liriospyris sp. 2, Middle Miocene, AMPH 6P, in various positions. Other designations same as in fig. 10.
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