E. OWENI. — SPICULATION. 213 



The basalia (PL VI, fig. 9) differ in no way from the same 

 of E. marshalli, except in being slightly more slender and in 

 having perceptibly smaller anchor-heads. The anchor-teeth, of 

 which there are 3-7 in each head, are strong and abont 40 /i long. 

 The distance from tip to tip of any two oppositely situated 

 anchor-teeth measures 70-85 //.. The entire head is of about the 

 same leuo;tli. The shaft is less than 20 n thick close to its ori2;in 

 from the head, only about 7 /y- at a short distance above the 

 axial cross, and not more than 30 n in the thickest part farther 

 above. — Some abnormally formed anchor-heads that I have found 

 are figured in Pi, VI, figs. 7 & 8. In one of these cases the 

 teeth are developed only on one side of the miter-shaped knob ; 

 the suppression of the development of teeth on the other side is 

 evidently due to the head having lain with that side pressed 

 against a compact bundle of its fellows. — I have discovered no 

 more pentactin-anchors than Schulze did. 



The dermalia may be nearly 1 mm. long. On the whole 

 they are somewhat smaller than in E. ynarskaUL All the rays 

 are nearly smooth throughout and tapering, but usually bluntly 

 pointed at the free end. Distal hilt-rays mostly 90-130 />« in 

 length and 3-7^/2 « in breadth near the center. Paratangential 

 rays 110-120 /y. long. — Exceptionally and then only along the edge 

 of especially sharp-edged ledges, the dermalia may be of unusually 

 large size. The hilt-ray may here reach a length of 400 /y.. It 

 participates, together with slender diactins, in the formation of 

 the inconspicuous row of bristles, before mentioned as having 

 been found in a certain specimen. 



The gadralia and canalaria are pentactins showing the rudi- 



