i 
4 
79 
i 
} gated with acuminate upper end, posterior one a little lower si- 
j tuated, rounded. Hinge with a single Cardinal tooth in each valve, 
that of the right valve hook-like, the left one broadly triangular. 
■ Ligament internal in a long oblique groove. 
i The animal (text-fig. 23) has thin mantie edges which are, as 
I a very narrow brim, reflected upon the shell 
i margin. The mantie edges are open in front 
' and backwards to about the middle of the shell; 
I for the greater part of this distance the edges 
i are smooth, but above the pedal opening they 
1 r 1oi 
j are furnished with small scattered papillae. Spaniorinns zeiandicus n. sp 
I Behind the foot a long suture follows, which 
I occupies the whole posterior end of the animal. It is pierced by 
I a single perforation; the small and narrow anal siphon, which has 
only slightly raised margins. Along the posterior margins of the 
mantie numerous small 
tentacles extend as far as 
above the adductor. There 
are two gili plates on each 
side coalesced in their low¬ 
er ends with each other 
and the mantie. They ex¬ 
tend far dorsally behind 
the umbones. They are 
smooth, and both have 
well developed reflected 
lamellae. The posterior 
(external) gili is the nar- 
rower one, and its reflected lamella extends beyond the gili axis 
behind; here it is covered by a lappet of the mantie, produced 
by the tentacular muscles, which are unusually strongly developed 
at this point. The labial palps are large, triangular, and distinctly 
furrowed.- . The foot is very large, compressed, and has a byssus 
, groove posteriorly. 
Dimensions: L. 6, h. 3.8, crass. 2 mm. 
Localities: North Island: 16, 1 right valve, 1. 5. — Auckland 
Island: 43, 1 sp., 1. 6. 
This family and genus were not hitherto represented in the 
