No. 447 ] BREEDING HABITS OF CRAVI'ISH . 



Some eleven days later a very 1; 

 length of 29 mm., a width of thorax c 

 mm. beyond the rostrum, antenna: 

 expanse of 14 mm. This creature ^ 

 with less tendency to keep high up a 

 also was dark greenish, finely spec 

 the legs. IJttle translucency was 

 much like a diminutive adult. The 

 with blue and had dark red at their t 



and the following four pairs of j^leopitds were not nio(h(ial 

 the male now has but one pair of modihed |)le(.piKls as is ll 

 in the lobster. 



We may summarize the growth and moultings of the y< 

 a single female during two months as follows. The eggs 1 

 night of March 28th, hatched into a first stage May rSih. 

 a length of 4 mm. they lived two days and moulted into a 

 stage. This second stage was 4^ mm., long and lived s 

 from May 20th. The third stage was 8 mm. long and tro 

 26th lived 18 days. The fourth stage was 12 mm. lo 

 from June 13th lasted 17 days. The 5th stage was 15 -1 

 long and lived from July ist five days. The sixtli stage \ 

 mm. long and from July 6th, lived eleven tlays. I he s 

 stage was 29 mm. long, and from July i/thlixedanu 

 mined time as observations were then tliscontmued. J h 

 and second stages remained attached to the mother tor ab< 

 week and were not more than 4i mm. long. 1 he ihnd > 



. long, kept ( 



lother fo 



lived an independent existence fora week. 1 he loi,owi, 

 were all independent and gradually took on all tlie a(Ui 

 tions and colorings. 



Groivth of vonna: crayfish. — young were left 1 

 with running water, mud, water plants, anodons and 

 feedings with raw hen's egg till October 6th. I hen c 

 surv-ivors from a hundred or so were found. These > 

 measured and as seen in Table I they varied great! 

 amounts they had grown, though all were hatched 

 eggs of the same mother. 



