OXTSTOMATOUS AND ALLIED CRABS OF AMERICA 



leg is measured on the lower margin, from the articulation of the coxa 

 with the sternum to the tip of the dactylus. 



The width of articles of the chelipeds and legs is measured at the 

 widest part. 



The length of the immovable finger is measured from the tip to the 

 extremity of the sinus between the fingers. 



See figures 1 and 2 for diagrams of an oxystomatous crab. 



Figure 2. — Diagram of ventral view of an oxystomatous crah, showing tlie terms used in description. By 



Waldo L. Schmitt. 



CHARACTER OF BOTTOM 



Under "Material examined" and in the tables the abbreviations 

 indicating the character of the bottom are those employed by the 

 U. S. Bureau of Fisheries. Nouns begin with a capital, adjectives 

 with a small letter. 



bk black 



br brown 



brk broken 



bu blue 



calc calcareous 



Co coral 



corln coralline 



crs coarse 



dk dark 



fne fine 



For Foraminifera 



G gravel 



Glob globigerina 



gn green 



Grs. 



gy-- 



hrd- 

 Ige- 

 lt._ 



M.. 



.grass 

 -gray 

 .hard 

 -large 

 .light 

 .mud 



Nod nodules 



Oz ooze 



P pebbles 



Ptr pteropod 



R rock 



rd red 



Rf reef 



rky rocky 



rot rotten 



S sand 



sctrd scattered 



sdy sandy 



sft soft 



Sh sheUa 



sm small 



Sp specks 



St stones 



stky sticky 



vol volcanic 



Vv'^ seaweed 



wh white 



yl yellow 



