Zoology.-] NATUEAL HISTOEY OF VICTORIA. [_Echinodermata. 



of height and the very large ovarian openings being characters 

 probably connected with development of the ovaries. The dissec- 

 tion of numerous individuals would be interestina: as settling this 

 point. The number of primary tubercles does not present the 

 special difference thought hy M. Agassiz, as these are certainly the 

 same in both supposed species in all my specimens. The ocular 

 pores seem double. 



Not uncommon in Port Phillip and Western Port Bays on sandy 

 bottoms, at about 40 fathoms. 



Explanation op Eiguees. 



Plate 100.— Fig. 1, full-sized specimen, natural size. Fig. 2, test, denuded of spines, to 

 show the proportion of the ambulacra and inter-ambulacra, with the perforated primary 

 tubercles, imperforate secondary and miliary tubercles, bare margins and pits at angle of the 

 plates, natural size. Fig. 3, oral region, partly denuded of spines, showing the teeth and small 

 curved spines bent over the mouth, natural size. Fig. 4, apical region, partly denuded of 

 spines, showing the very small ovarian openings far in from the edge in the patch of miliary 

 granules, the margins of the plates bare ; and the apparently double oculars, natural size. 

 Fig. 5, portion of apical region with cup-tipped spines, natural size Fig. 6, portion of ambu- 

 lacrum, showing the proportion of the two porous arese to the middle area and the pairs of pores, 

 row of secondary tubercles and miliary granules on the ambuJacral plates, with the bare mar- 

 gins, depressions at angles, miliary granules, and row of secondary tubercles of the inter- 

 ambulacral plates bordering the ambulacra, twice the natural size. Fig. 7, inter-ambulacral 

 plates, showing the scrobicular area with the perforated primary tubercle in centre, the circle 

 of imperforate secondary tubercles round the scrobicular area, and the rows of miliary granules 

 not extending to the margins, which are left smooth, twice the natural size. Fig. 8, upper view 

 of large primary spine, showing the plated modification of summit, natural size. Fig. 8a, side 

 view of same, showing the sharp spines on the upper surface replaced by blunt tubercles on 

 the lower surface. Fig. 8b, end view from below of same, to show the convexity of the thorny 

 upper surface and the comparative flatness of the tuberculated under surface. Fig 9, upper 

 surface of one of the large primary spines, showing the obliquely radiated circle of long thorns 

 round the funnel-shaped terminal cup. Fig. 10, smaller spine from oral region, natural size. 

 Fig. IGrt, top view of ditto. Fig. 11, truncated cup-shaped spine from apical region, natural 

 size. Fig. 11a, side view of same. Fig. 12, upper side of small, curved spines round the mouth, 

 magnified two diameters. Fig. 12a, side view of same, showing curvature towards smooth oral 

 surface. Fig. I2b, section of same. Fig. 13, upper surface of secondary spine, showing its 

 truncated tip and nearly parallel sides, three times natural size. Fig. 13a, same, viewed side- 

 ways. Fig. 13i, section. Fig. 14, the elongate form of pedicillaria from the edge of the 

 ambulacra, magnified twenty diameters. Fig. 15, short globose sort of pedicillaria, magnified 

 twenty diameters. 



Frederick McCoy. 



By Authority : John Fekkes, Government Printer, Melbourne. 



[35] 



