No. 638] 



MELIBE LEON IN A (GOULD) 



245 



should mate togethei-; tlici'c is, in t'nct. sclcclivc pair- 

 ing which is of a distiiicl i\- ;i(l\ ;nit;ii:v()iis or " purpo^rl'ul" 

 character, snice it makes foi- the iiiiill 1 1 ilicat ion ot the 

 species. The same author. V,)\7<i, records ihc iiiii(|Uc liiid- 

 iiij^s relative to a rather high degree of coricl.it loii 

 between the sizes of the two pairing memlicrs of Clu niuo- 

 (htris zrhra. The wi'itcr ha.s ol.M'rvcd tlir -;,nir ln,-t i-, la- 

 tivc to copidatioii anion- the K.-lid.-e. As f,,,- Mrniw 



of the same relative si/c. I'.nt cxcii >o. ;is >ft'n in the 

 second nidosome of Mrhhc, tlic animal max lain short of 

 spermatozoa during ()\a-(h'posit ion. To uiiai-d airainst 

 this, there is, as shown ( 'i-(»/ici-. anionu' cci iain species, 

 selective pairing between in(!i\ i<hials ot' neai-l\ the >ame 

 size. Garstang, ISDO, liml.- a eonsi(lefal)le waiaation be- 

 tween the otTsprinu' of [.nnniHofHs \'«'rany, --th.' indi- 

 AidiiaU appareiitlx ^houinu a tend.ne> to unite rather 

 with those of theii- ..wn vai'i.'tv :han with tho>r unlike 

 themselves." 



