REPORT ON THE ECHINOIDEA — MORTEN SEN 

 Genus GONIOCIDARIS L. Agassiz and Desor. 



GONIOCIDARIS (DISCOCIDARIS) PELTATA, new species 



261 



Plates 55, 56; plate 74, figs. 4, 5; plate 78, figs. 9-12 



Locality. — Station 5617; Dodinga Bay, Gillolo Island; Ternate 

 Island (SE.) bearing S. 45° W., 7 miles distant (lat. 0° 49' 30" N., 

 long. 127° 25' 30" E.) ; 239 meters; November 27, 1909 (1 specimen, 

 the type, Cat, No. E. 1324, U.S.N.M.). 



Measurements 



Description. — The test is rather high, flattened above, less flattened 

 beneath. The sides are gently arched. The circumference is circular. 

 The ambulacra are distinctly sinuate. The interporiferous zone is 

 about twice the width of a pore zone. The marginal series of tuber- 

 cles is very regular; the tubercles are not very conspicuous, but are very 

 nearly contiguous; sometimes small miliary tubercles occur between 

 adjoining tubercles. Within the marginal tubercules the plates are 

 thickly set with very small miliaries, which are arranged more or 

 less distinctly in transverse series. There is no distinct naked median 

 vertical line; the horizontal sutures are deepened so as to form rather 

 distinct grooves. The whole interporiferous area sinks slightly toward 

 the middle line. The pores are somewhat sunken, the wall separat- 

 ing them being only slightly elevated. The ridge between the pore 

 pairs is fairly high. (PI. 74, figs. 4-5.) 



In the interambulacra the areoles are fairly deep; only the two or 

 three proximal ones are confluent, The scrobicular tubercles are 

 slightly larger than the ambulacral marginal tubercles, half-moon 

 shaped, and separated by small miliary tubercles. Alternating with 

 the scrobicular tubercles there is a single tubercle about half their 

 size outside the scrobicular ring, and the rest of the median part of 

 the interambulacral plate is closely set with very small irregularly 

 arranged miliary tubercles, which also occupy the midline, so as to 

 leave only a vertical series of small slightly sunken grooves separated 

 by miliary tubercles across the midline. The grooves formed by the 

 horizontal sutures are very small and inconspicuous. On the adra- 

 dial side of the plates there are also a few miliary tubercles outside 

 the scrobicular ring. The median part of the interambulacra is 

 only little more than half the width of a corresponding areole; it is 

 scarcely sunken toward the middle line. 



