LEE BARKER WALTON 63 



duplicates are used for exchange, the former number 

 should be crossed out and the new one substituted, while, 

 at the same time, a reference number referring to the ex- 

 change may be added. 



Sex. — The sex can be designated by the conventional 

 signs, c? , 2 , ^ , representing male, female, and herma- 

 phrodite forms. 



Growth. — Embryo, young, adult. Measurements, 

 weight, etc. 



Scientific name. — In systematic work of this nature the 

 generic followed by the specific name must be used. 



Authority for identification. — This is an important 

 item which is too often omitted from the average mu- 

 seum catalogue. If a specialist subsequently verifies a 

 name previously given, this should also be noted. In case 

 the name is found incorrect a new card is to be written. 



Date of identification. — It is well to have this informa- 

 tion available. 



Locality where collected. — Too much care cannot be 

 exercised in accurately indicating the locality from which 

 specimens are obtained. It is safe to say that every muse- 

 um has among its collections material which would be of 

 utmost value, provided the locality, even within a few 

 hundred miles, could alone be ascertained. Unfortun- 

 ately in most cases of this kind, it is the collector who is at 

 fault. The cataloguer must rely on his data. 



Name of collector. — Inasmuch as the 'personal equa- 

 tion' must be taken into consideration, the name of the 

 collector is indispensable. Furthermore, it often furnishes 

 a clue to the history of a specimen when all other means 

 have failed. 



Correspondence. — Letters, etc., pertaining to the par- 

 ticular specimens can be indicated as suggested in the ac- 

 cession catalogue. 



Date when collected. — This can be indicated as in the 

 accession catalogue. 



