delectus personae

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
DELECTUS PERSONAE. This phrase, which literally signifies the choice of a 
person, is applied to show that partners have the right to select their 
copartners; and that no set of partners can take another person into the 
partnership, without the consent of each of the partners. Story on Partn. 6 
Colly. on Partn. 4; 1 Swanst. 508; 2 Bouv. Inst. n. 1443. 
    

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