26 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



the collector's name, and, in parentheses, the name of the responsible 

 author. Excepting records designated as "extralimital" or "fossil", the 

 first and last entry ma}' be taken as delimiting the presently accepted 

 range of the species. 



Cognate species: The congener most nearly related to the Pacific 

 species under consideration, usually its Atlantic analogue. 



Diagnosis: The attributes most useful in separating the species from 

 its Pacific congeners and upon which a key might be based. A brief 

 description of the male first pleopod is included. 



Description: The most complete characterization of the species 

 available. Where the description is taken wholly or in large part from 

 the literature, the original author's name appears in parentheses follow- 

 ing the last paragraph. Where modern terms have been substituted for 

 archaic, the substituted words or phrases are enclosed in brackets. Where 

 other significant alterations have been made, including changes in the 

 author's sentence structure to conform with the abbreviated or "tele- 

 graphic" style used in the original portions of this work, the word 

 "modified" follows the author's name. 



Material examined: Specimens are first listed by source, if from col- 

 lections other than those of the Allan Hancock Foundation, then by 

 locality, from north to south. If three or more stations are involved, 

 reference is made to a table in the appendix in which supplementary 

 records are listed. Station numbers, unless otherwise indicated, are those 

 of the Velero III and Velero IV. The last two figures following the 

 hyphen denote the year of the expedition. Station numbers are consecutive 

 throughout and, with the exception of Galapagos stations, separately 

 treated (Garth, 1946), expedition year and date of collection correspond. 



Measurements: A standard set of twelve measurements is used 

 throughout: length of carapace, width of carapace, length of rostrum, 

 width of rostrum, length of cheliped, length of chela (manus plus im- 

 movable finger), length of dactyl (movable finger), height of palm, and 

 length of walking legs 1, 2, 3, and 4. (See also Explanation of Measure- 

 ments). 



Color in life: Notes made from living specimens, although un- 

 published, are credited to Anker Petersen, former staff artist, in recogni- 

 tion of his efforts in this connection and to distinguish them from the 

 published notes of Crane and others. Colors are based on Ridgway, "Color 

 Standards and Color Nomenclature" (1912).* 



•For a modern appraisal of Ridgway's color standards, see Hamly (1949). 



