100 ‘“ BNDEAVOUR ” SCIENTIFIC RESULTS. 
Twenty-five miles south-east of Double Island Point, 
Queensland. 
Eleven miles south-east of Ballina, New South Wales, 27- 
29 fathoms. 
Genus CIDARIS, Leske. 
CIDARIS CONFERTA,! sp. nov. 
(Plate xxxviii., fig. 1-4.) 
Test little flattened ; vertical diameter about .60-.70 of 
horizontal; coronal plates 7 or 8; areole large, nearly 
circular, only the lowest 2 or 3 confluent ; median interambu- 
lacral area with vertical suture quite distinct and 3-4 series 
of tubercles on each side of it; ambulacra about one-fourth 
of interambulacra in width; poriferous zones not sunken, 
very narrow, the pores close together; median ambulacral 
area with a double series of tubercles on each side, inner much 
smaller ; vertical suture not very distinct ; pores large, nearly 
circular, only slightly oblique. Abactinal system about .46 
of horizontal diameter of test, nearly circular and clearly 
defined, flat or slightly elevated, well covered with small 
secondary spines; genital plates large and nearly square, 
outer margin a little convex and inner equally or more 
concave, with pores near distal margin; ocular plates tri- 
angular or with inner angle truncated when plate is fully 
insert, as wide as high or wider, with pores very close to distal 
margin; in four specimens oculars I, V and IV are insert, 
while in the largest specimen all are insert, though IV is very 
narrowly so; anal system about one-half diameter of abac- 
tinal system, covered by a marginal series of 8-10 rather large 
plates and 12-15 (or more) smaller ones within ; all abactinal 
and anal plates are fairly covered by rather coarse tubercles; 
there are 2-10 on the anal plates, 30 or more on the oculars, 
and 50 or more on the genitals. Actinostome small, only 
about .37 of horizontal diameter of test, not at all sunken, 
closely covered by stout plates, 12-15 in each interambu- 
lacrum and about a dozen pairs in each ambulacrum. Pri- 
mary spines when fully grown 60-70 mm. long, and 2.5-3.5 mm. 
thick, cylindrical and tapering rather abruptly to a bluntly 
pointed tip ; in the largest specimen they are distincly com- 
pressed near tip; except when still immature, they are very 
closely covered by low, rounded granules, which are so closely 
crowded they do not form longitudinal series as is usual ; the 
collar is very low, about 1-1.5 mm. high, very finely striate 
1. Confertus=crowded ; in reference to the densely crowded granules 
on the primary spines. 
