MONOGRAPTUS. 



497 



ing to the Germs Monograptus. 





GROUP I. -A. (UNIFORM). 





3f. jaculum. 



M. variahilit. 



M. nudus. 



3/. dubius. 



M. vulgaris. 





M. tumescent. 





M. comis. 



M. cf. goth- 

 landicut. 



M. ef. ultimui. 















var. cartus. 





var. minor. 











straight 



Straight 



Straight 



Straight, 



with 



proximal 



ventral 



curvature 



Stiff and 

 straight 



Shorter 

 and with 

 slight ten- 

 dency to 

 ventral 

 curvature 



Straight, 



with strong 



ventral 



curvature 



in proximal 



portion 



Small 



dwarfed 



form 



Small 



with 



ventral 



curvature 



Short, with 

 slight 

 ventral 



curvature 



Small, 

 slender, 



with slight 

 ventral 



curvature 





1'5 mm. 



1 mm. 



2 mm. 



2 mm. 



2-5 mm. 



To mm. 



2 mm. 





2 mm. 



2 mm. 



2 mm. 





•7 mm. 



15 mm. 



1 mm. 



17 mm. 



2 mm. 



— 



2 mm. 



— 



2 mm. 



2 mm. 



2 mm. 





14—9 



12—8 



9—10 



11—8 



12—9 



— 



11—9 



— 



11 



9—8 



12—11 





Slight— i 



Slight— i 



i 



About i 



^-f 



— 



\-l 



— 



! 

 3 



i-h 



i 





Wide, 

 even, hori- 

 zontal 



Even, hori- 

 zontal, or 



slightly in- 

 troverted 



Even, 

 wide 



Even, 

 flanged, 

 normal 



Even, 

 flanged, 

 normal 





Even, 

 flanged 





Even, 

 flanged 



Even, 

 flanged 



Evepi 





7 : 1 



4: 1 



2i:l 



2—3 : 1 



4: 1 



3: 1 



4 : 1 



— 



3-4: 1 



4^-1 



3—4: 1 











GROUP I.- 



B. (BIFORM). 















J/, variant. 





M. Ecemeri. 



M. ckim(pra. 







M. leintwar- 

 dinensis. 







var, ludensis. 



var. com- 

 paetus. 





var. pumilus. 







var. Salweyi. 



var. aemi- 

 spinosus. 





var. 

 incipiens. 







Smaller, 

 with more 

 curvature 



Straight, 



slight 



ventral 



curvature 



Small size 

 and slight 

 proximal 

 curvature 



Slight dorsal 



curvature 



distally, with 



slight ventral 



curvature 



proximally 



Straight, 



with slight 



ventral 



curvature 

 proximally 



Smaller size 



and 



straighter 



proximal 



end 



Broader 



Short, 



straight, 



with slight 



proximal 



curvature 



Broader 





— 



— 



2 mm. 



— 



3 mm. 



2 mm. 



1-6 mm. 



25 mm. 



16 mm. 



2-3 mm. 





— 



— 



2 mm. 



— 



I'S mm. 



2 mm. 



— 



— 



21 mm. 



— 





— 



16-14 



14—10 



16—14 



16—11 



13-11 



i 



4 



— 



— 



14—15 



1 



— 





— 



* 



2 



— 



2 

 3 



— 



— 





— 





One theca 

 only retro- 

 verted 



— 



. Like M. 

 colonus 



— 



Like M. 



colonus 



All spined, 



otherwise 



like M. 



colonus 



Longer 

 and more . 

 flexed 

 spines 



Spined 

 TJnspined 



• 



. Like M. . 

 chimxra 



Spined 

 TJnspined 





6: 1 





2—3 : 1 



— 



5i : 1 



4 : 1 



— 



— 



3 : 1 



— 



