AGASSIZ AND WOODWORTH: VARIATIONS IN EUCOPE. 127 
In five-rayed Eucope only one specimen was observed with equally 
developed genitals (Plate V. Fig. 1). Those figured on Plate VI, as 
well as the others on Plates IV. and V., all show a very great range 
of variation in their development. In two cases (Plate IV. Figs. 3, 6) 
two of the genitals are wanting. 
In Plate VL, Figures 1 and 2 are those of two specimens with five 
radial eanals, both of which fork so near the base of the manubrium 
as to divide the disk into six nearly equal segments. 
The accompanying table will show the other variations which have 
been observed, and their frequency. 
1146 SPECIMENS EXAMINED FOR VARIATIONS IN THE DEVELOPMENT OF THE 
GENITAL ORGANS ON EACH OF THE FOUR RADIAL CANALS. 
With Three Radial Canals, or Three with Fork. 
1; 2; 8; 3 females, and 1 male. 
BICI a" S "5 1g T 
— 
, 
1; 1; 1; 1 female. 
FFF 
With Four Radial Canals. 
1; 1; 1; 1;* 447 females and 175 males. 
III Wr 89 4 "29. Vt 
1; 1; 2;2; 46 a "Sa uy 
1121/2; 3;. 09 hy T ay 
is lelia oas A "en Iscr 
11219; 4; 20 2 SR AE. o" 
1;0: 0, 0» 2.924 : ts AH 
131; 0:0; 21 -T ) 
1/2 ,99903 19 t à 
159404060 18 Sot 
Lp ene: 03 10 8 
Le 3,900: 6 t 8 * 
1314 9 5 T Es" 
ai es 5 ‘ £79 
as 23.8) à 4 E 
1;0;0;2; 8 18 
1;0;2;3; 3 2 « 
by Deh Ss 4 males 
2 
* 1, fully developed genitals; 2, genital smaller than 1; 8, genital smaller 
f 
than 2; 4, genital smaller than 3; 5, genital smaller than 4; 0, genital organ 
absent. The semicolon (;) indicates the position of the radial canal. The —- 
indicates the forking of the radial canal. 
