Tertiary. | PALAONTOLOGY OF VICTORIA. [{ Echinodermata. 
Pirate LX., Fics. 1-4. 
LOVENIA FORBESI (McCoy). 
[Genus LOVENTA (Desor. EmeND.) = HEMIPATAGUS (Desor.) = MARETIA (Gray). 
(Sub-kingd. Radiata. Class Echinodermata. Order Echinida, Fam. Spatangide.) 
Gen. Char.—Testa thin, cordiform, narrow, and truncated behind ; large primary tubercles 
perforated, in deep pits, those of upper surface on the two anterior pairs of interambulacra, 
absent on the posterior interambulacrum ; ambulacral petals moderate, the anterior half of the 
apical portion of the anterior lateral petals obsolete ; anal opening on the narrow truncated 
posterior end ; anterior ambulacrum sunk in a broad shallow groove ; genital pores four, the 
anterior pair smaller and closer together than the posterior pair. Under side with a nearly 
smooth central plastron, with the transversely lunate mouth excentric towards the anterior side ; 
lateral portions flatter, with large primary perforated tubercles in deep pits. Fascioles, one 
internal on upper surface, and one spectacle-shaped subanal one, with a group of primary 
tubercles in dilated lateral portions ; miliary tuberculation, small (but much larger than that 
of the fascioles), covering the whole upper surface, and between the primary tubercles below. ] 
Description.—Cordate, subpentagonal, greatest width about middle of posterior 
lateral interambulacra, variable; profile moderately arched from apex to front, less 
arched to overhanging posterior margin; greatest depth a little behind the apex ; 
posterior truncated end narrow, with an obtuse ridge extending to the apex, from 
which the sides slope with slight convexity to the obtuse lateral margins; anterior 
sulcus and notch in front margin varying in depth, the obtuse bounding ridges 
covered with a band of rather coarse miliary tubercles; anterior pair of lateral 
ambulacra diverge obliquely with a slight forward and outward curve from the apex ; 
posterior pair of ambulacra shorter and straighter than the anterior lateral pair ; 
forming less than a right angle with each other; ocular pores very minute ; whole 
upper surface granulated with close fine miliary tubercles; a band of larger ones, 
with finer between, on the ridge on each side of anterior sulcus; primary tubercles 
large, perforated, not crenulated, in very deep pits, 4 to 11 in one to three rows on 
anterior lateral pair of interambulacra, and 4 to 11 in two to five rows on anterior 
part of posterior lateral pair of interambulacral spaces; under side with numerous 
primary perforated tubercles on the sides, in very deep pits, to the anterior outer 
portion of which they are excentrically confluent; plastron, or prominent middle 
portion, comparatively smooth, with fine miliary granules forming a large radiating 
semicircular group just in front of the subanal fasciole, and a few more scattered on 
the more anterior plates; spectacle-shaped subanal fasciole of very minute granules 
with a circular group of small primary perforated tubercles within each of the lateral 
dilated ends, which also include three or four pores of the posterior ambulacra. 
[nternal fasciole narrow, of very minute granules, forming an acute angle just 
behind the madreporiform tubercle, extending straight outwards and forwards to 
apex of posterior lateral interambulacra, thence with an obtuse angle extending 
forwards, with a slight outward concavity, along outside of granulated bounding 
ridges of anterior sulcus, extending about half-way from apex to margin. Usually 
about fourteen pairs of pores in each perfect ambulacral band, but varying from ten 
to sixteen. 
Var. A—With 8 to 5 tubercles in 2 or 3 rows on posterior lateral interambulacra. 
Length, 1 inch 4 lines ; proportional greatest width, +°%;; from posterior end to apex, 
vo; depth, +o 
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