Ambocoelia cf. A. gregaria Hall, 1867

Fig. 4J.

Ambocoelia umbonata var. gregaria; Hall 1867: 195, pl. 44: 19–25.

Ambocoelia gregaria; Linsley 1994: 104, 233, pl. 126: 1–7.

Material.—Figured specimen NYSM 15719, crushed specimen of ventral valve shown in the upper left part of Fig. 5D, three additional specimens on same slab as aforementioned specimens (two ventral, one dorsal valve).

Remarks.—The dorsal valve shown in Fig. 5J (NYSM 15719) is comparable to Hall’s (1867) dorsal valve illustrated on his pl. 44 (fig. 19). The two unnumbered specimens of ventral valves have a ventral sinus originating near the beak as seen Hall’s (1867: pl. 44: 19–25) A. gregaria . Additional material isrequiredtoconfirmthisprovisionalspeciesidentification.