BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



EXPLANATION OF MEASUREMENTS AND ABBREVIATIONS USED 



Explanation of measurements 



The length of the carapace, unless otherwise stated, is measured 

 on the median line, from the anterior to the posterior margin. 



The width of the carapace is measured at the widest part. 



The fronto-orbital width or exorbital width is measured from the 

 outer angle of one orbit to the outer angle of the other. 



The length of the segments of the chelipeds and legs is measured on 

 the upper or anterior margin. The length of the whole cheliped or 

 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 the segments of the chelipeds and legs is measured 

 at the widest part. 



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

 the extremity of the sinus betw^een the fingers. 



Character of bottom 



Under "Material examined," the abbreviations indicating the 

 character of the bottom, are those employed by the Bureau of Fish- 

 eries. Nouns begin with a capital, adjectives with a small letter. 



bk black 



br brown 



brk broken 



bu blue 



Co coral 



crs coarse 



dk dark 



fne fine 



For f oraminif era 



G gravel 



Glob globigerina 



gn green 



Additional abbreviations and notes 



In the synonymy an attempt has been made to give all the different 

 names or combinations which have been used, but not all the refer- 

 ences to a species. 



In the lists under "Material examined" a number in parenthesis 

 following an indication of a specimen or specimens denotes a cata- 

 logue number of the United States National Museum unless otherwise 

 indicated. M.C.Z. =Museum of Comparative Zoology; P.M.Y. 

 U. = Peabody Museum of Yale University; Mus. S.U.I. = Museum 

 of the State University of Iowa; y. =5^oung; B.A. = Museo Nacional 

 de Historia Natural, Buenos Aires, Argentina. The words "U. S. 

 Fisheries" should be understood before "Str. Alhatross," "Str. Fish 

 Hawlc," and "Sch. Grampus." 



