34 bulletin ok the natural history society. 



Some Types of the Protolenus Fauna. 

 Brachiopod. 



Trematobolus insignis. — a. Interior of the ventral valve. />. Interior of 

 the dorsal valve. c. Dorsal valve seen from behind. d. Inside of beak of 

 ventral valve. Notation of the muscles, etc. p. a. Posterior adductor. ". '/. 

 Adjuster muscles. /. m. Lateral muscles, a. }>. Anterior depression. <■. //. 

 Cardinal pit. c. Cardinal process. s-. Hinge socket, t. Dentiform process 

 of the ventral valve. /. Foramen. From Assize 2, Band b, Div. 1, St. John 

 (iroup at Hanford Brook, St. John County, N. B. 



Trilobites. 



Protolenus elegans, W. D. Matthew (second group on left side). — The 

 upper figure represents the head shield. The detached piece to the right is the 

 movable cheek. The middle figure shows a joint of the thorax. The third 

 figure is a side view of the head-shield. 



Protolenus paradoxoides (second group on right side). — This represents 

 the head-shield, with the movable cheek to the right, a little separated from 

 the middle piece. 



N. B. — All the above are figured of the natural size. 



Protolenus articephalus (third group on left side). — The upper figure 

 represents the middle piece of the head-shield. The second figure shows this 

 part viewed from the side. 



Ellipsocephalus galeatus (third group on right side). — The upper figure 

 represents the head-shield, with the movable cheek somewhat separated. The 

 second figure is a side view of the same. The third figure represents a segment 

 of the thorax. The fourth figure is a side view of the middle piece of tin- head- 

 shield, of the variety or mutation agrauloides. 



N. B. — All the figures of the third groups, right and left sides, are magnified 

 two diameters. 



Olenus Zoppii, Menigh. — A complete trilobite, supposed to he a later 

 derivation from the same stock as Protolenus. From the Cambrian of Sardinia, 

 Italy. Introduced to show an entire trilobite of this family, and the relation 

 of the different parts of the test of a trilobite to each other. The other figures 

 of trilobites here given show parts of the test only. 



The following genera compose the Protolenus Fauna: FoRAMINIFERA, Or- 

 liulina 4 sp., Globigerina 4 sp. Spongida, Monadites, Protospongia, Astro- 

 cladia? Brachiopoda, Lingulella 2 sp. , Lingulella? 2 sp. , Obolus, BotstWdia, 

 Trematobolus, Protosiphon, Obolella, Linnarst-onia, Acrotreta "_'s|i.. Acrothele. 

 Mollusca, Hyolithellue? Coleoides? Orthotheca, Hyolithes 5 sp., Diplotheca 

 2 sp, Pelagiella, Vblbarthella. Ostbacoda, Bipponicharion 3 sp. , Beyrichona 

 6sp., Aparchites 2 sp. , Primitia 4sp., Schmidtella, Leperditia 4 sp. , Beyrichia. 

 Phvllopoda, Lepiditta. Tkiloiuta, Protagraulos, Ellipsocephalus 3 sp. , Mic- 

 macca 4 sp., Avalonia, Protolenus 2 sp., subgen. Bergeronia 2 sp. 



