CHAETOG-NATEA (Continued) 



Species 



Chromosome Number 

 2n n 



Remarks 



Observer 



References , 



Sagitta bipunctata 

 S. elegane 

 S. inflate 



S. minima 



18b 



18m 



18m 



18m 



9S(1,H) - 

 9o.(l,ll) 



9$(1,11) - 

 9o_(l) 



9^.(1) 



9^(1,11) - 

 9^(1,11) — 



Stevens 

 '03,' 10 



Stevens 

 '05, '10 



Buchner 

 '10 



Stevens 

 '10 



Stevens 

 '10 



Z.Jb. 18; J.M. 

 21 



Z.Jb. 21; 

 J.M. 21. 



Pest. Hertwig. 1. 



J.M. 21. 



J.M. 21, 



MOLLUSCA 



SCYPCDA 

 EULAYHUBRAMCHIA 



Species 



Chromosome Number 

 2n n 



Remarks 



Observer 



References 



Cuminfia tellinoides 



18$ (1,11) Jordan '10 



'orr 



'13 



36m l^o(l,ll) Morris '17, 



l(3m(Parth.) 



Cumineia sr. 



50-6Cm(rarth.) 



I60 p olar body Mackay '27 



A.Zf.4. 



J.E.Z.22; 

 r . n .35. 



Trans. Nova Scot. 



♦In the following species the types of the sex chromosomes were only given; 

 Nassa mutabilis (X-t) , Marsenia sp. (X-Y) , Turitella terebra (X-Y), Ceritium vulgatum (X-0) , 

 Conus europeus (X-0), Columbella rustica (X-0) , Neretina fluviatilis (X-0) , Vermetus gigas 

 (X-0) (Kuschakevitsch '24, Z.Z.M.A.). Heritina fluviatilis (X-0) (Aleksenko '27, Acad. Sci, 

 Ukraine Mem. CI. Sci. Phys. Math. 6). 



-19- 



