151 



BRACHIOPODA. 



No. 731. Rhynchonella increbescens, Hail. 



This and the succeeding ten Brachiopods belong to the Rhyn- 

 cTwnellidae, a family separated from the preceding to include all 

 those "lamp shells" with sharp beaks, plaited valves, and short 

 curved arm-supports. This specimen is from the Hudson 

 River group (Lower Silurian), Iron Ridge, Wis. Price, $0.15. 



No. 732. Rhynchonella Barrandi, Hah. 



This specimen is from the Oriskany sandstone (Devonian), Albany Co., N. Y. 



Price, $0.50. 



No. 733. Rhynchonella Deslongchampsi, Dav. 



From the Jurassic of France 



Price, $0.15. 



No. 734. Rhynchonella Eatonia-formis, McChesney. 



From the Coal Measures, Big Creek, 111. Price, $0.15. 



No. 735. Rhynchonella meridionalis, Coquand. 



Froni the Jurassic of France. Price, $0.25. 



No. 736. Rhynchonella oblata, Hall. 



From the Hudson River group (Lower Silurian), Iron Ridge, Wisconsin. 



Price, $0.25- 

 No. 737. Rhynchonella speciosa, Munst. 



From the Middle Oolite, Kelheim, Bavaria. Price, $0.35. 



No. 738. Pentamerus oblongus, Sow. 



This fossil has a very wide distribution across the Silurian 

 basin of the New York system, where it serves to mark and 

 name a constant horizon — that of the " Lower Pentamerus lime- 

 stone." Interior cast of an unusually large individual. From 

 the Clinton group (Upper Silurian), near Milwaukee, Wis. 



Price, $0.50. 



No. 739. Pentamerus oblongus, Sow. 



From the Clinton group (Upper Silurian), Rochester, N. Y. Price, $0.25. 



No. 740. Pentamerus galeatus, Dalman. 



From the Lower Helderberg ( Upper Silurian), Albany Co., N. Y. 



Price, $0.15. 



No. 741. Triplesia (Camerella) estans, Conrad. 



From the Trenton limestone (Lower Silurian), Middleville, N. Y. 



Price, $0.15. 



No. 742. Orthis eminens, Hall. 



This form, and the nine following, belong to the Ortlddce, a family of trans- 

 versely oblong, depressed shells, with straight hinge-line, notched area, small 

 beak, rarely a medial fold, and no arm-supports. This specimen is from the 

 Lower Helderberg (Upper Silurian), Albany Co., N. Y. Price, $0.20, 



