Gejiv.s LiiitJud iv Victoria.. 895 



posrerior labrum. Ambulacra petaloid, vmeqiial, narrow, but 

 deeply sunken, aivfeerior pair (70 mm. in the type) longer than 

 the posterior pair (55 mm.), the anterior pair showing an angle of 

 divergeilce of 125 degrees, whilst the posterior pair diverge at an 

 nngle of 50 degrees, all showing a slight forward curvature at 

 their extremities. Tlie odd anterior ambulacnun shallow at first, 

 then broadening and deepening, then further deepening and 

 narrowing owing to the overhanging and closely approaching 

 margins. 



Pores conjugate, upper series usually ovate, whilst the lower 

 series are sometimes more nearly circular or only slightly 

 elliptical, each ambulacral plate being perforated very near its lower 

 suture ; between thirty and forty pairs of poi'es exist in each 

 poriferous zone, the smaller uumljer being in the posterior 

 petals. 



The tubercles are remarkable in this species for their extreme 

 fineness, very minute mammillation, and uniformity on the 

 greater part of the abactinal surface, becoming a little coarser 

 towards the anterior notch. The sternum is medially finely 

 tuberculate, but becomes much more coarsely sculptured towards 

 the posterior ambulacral plates, between the latt-er and the 

 ambitus the coarsest tubercles occur, and these also show a 

 marked increase in size towards the front margin. 



Tubercles perforate, scrobiculate, and the coarser on the base 

 faintly crenulate, abactinal tubercles a little obliquely and back- 

 wardly directed, the boss usually being eccentric on the scro- 

 bicule. which has the appearance of a flat surface, and very 

 minute granules or miliaries siirround the outside of the 

 scrobicule. 



Finest scrolucules run three in 2 millimetres, while tlie 

 coarsest are of about 1 millimetre in diameter, and the coarsest 

 tubercle is not more than half a millimetre in diameter. 



There is a well developd but narrow (width. 1 mm.), and very 

 sinuous peripetalous fasciole, which margins very close up to the 

 petals ; a still narrower (about .5 mm.) lateral fasciole starts 

 from the peripetalous fasciole just a little behind and above the 

 end of the antero-lateral petal, runs gradually towards the 

 margin, then parallel with it for a distance before dropping 

 below the margin, and apparently dips under the anus, but the 



