Remarks upon the Kaskaskia Or on p. 37 



dials rest is the longest. Two sides- of eaeli rest upon the superior 

 sloping sides of the subradials, and the other two join the adjacent first 

 radials, except as to the right anterior first radial which joins one side 

 with the second az3'gos interradial, and the left anterior radial which 

 rests one side upon the first azygos interradial, and another joins the 

 third azygos interradial, while ai the angle of junction it is met by an 

 angle of the second az^^gos interradial. 



Second radials. — The second radials are pentagonal, longer than 

 wide, rounded and constricted in the middle, and support the arms 

 upon their superior sloping sides. 



Azygos interradials. — There are three azygos interradials. The 

 first is quadrangular — two sides rest upon the subradials, the left 

 superior side joins the left anterior first radial, and the right superior 

 side supports the second azygos iuteri^dial. The second is penta- 

 gonal, and rests upon the slightl}' truncated top of the anterior sub- 

 radial; its left inferior side joins the first azj^gos interradial; its right 

 inferior side joins the right anterior first radial, its right superior side 

 supports the right anterior second radial, and the left superior side 

 joins the third azygos interradial. The third is quadrangular, the 

 lower sides are joined by the left anterior first radial, and the second 

 azygos interradial, and the superior sides by the two anterior second 

 radials. 



Arms. — There are ten very long, strong, round arms supported upon 

 the superior sloping sides of the second radials. The}^ are composed 

 of wedge-shaped pieces, alternately arranged, so as to bring the thicker 

 ends upon each side of the groove, not upon the outer and inner face 

 ot the arm. The first arm pieces have each a length equal to the dia- 

 meter of the arm, and as they rest upon the superior sloping sides of 

 the second radials they are twice as long upon one side as upon the 

 other. Immediately above the first arm piece, two arm pieces have a 

 lengtli about equal to the diameter of the arm. but at the distance of 

 about three inches from the first arm piece, the diameter is about 

 equal to the length of three pieces. Each arm piece supports upon 

 its thicker end a long slender single-jointed pinnule. These pinnules 

 are alternately arranged on the two sides of the deep longitudinal 

 groove or channel on the inner face of each arm. The thicker ends of 

 the arm plates project, at the upper side, so as to form steps upon the 

 arm, which constitute additional supports for the bases of the pinnules. 

 The first piece in each pinnule is short and spreading at the base — 

 above this each piece is three or four times as long as its diameter. 



Proboscis. — The proboscis is long, and from appearances nearly 



