168 TELLINIDZ. 
Te.uina, Linn., 1758. 
Etym.— Telline, the Greek name for a kind of mussel. 
Distr.—Above 300 sp. In all seas, especially the Indian 
Ocean; most abundant and highly colored in the tropics. Low- 
water—coral zone, fifty fathoms. Wellington Channel, Kara 
Sea, Behring’s Straits, Baltic, Black Sea. Fossil, 170 sp. 
Oolitic—; United States, South America (Chiloe), Europe. T. 
rastellum, Hanley (exi, 56). 
Shell slightly inequivalve, compressed, rounded in front, 
angular and slightly folded posteriorly, umbones subcentral ; 
teeth 2°2, laterals 1—1, most distinct in the right valve ; pallial 
sinus very wide and deep; ligament external, prominent. 
Animal with slender, diverging siphons, twice as long as the 
shell, their orifices plain; foot broad, pointed, compressed ; palpi 
very large, triangular; gills small, soft and very minutely stri- 
ated, the outer rudimental and directed dorsally. 
TELLINELLA, Gray, 1852. Shell oblong, elongated, posteriorly 
rostrated or subrostrated ; hinge with two lateral teeth in one 
valve. TT. virgata, Linn. 
PERON HODERMA, Poli, 1795. Shell oval, compressed, posteriorly 
subangular; hinge with two lateral teeth in one valve. 7. 
punicea, Born (exi, 57). Not very distinct from Tellinella. 
M@rRA, H. and A. Adams, 1852. (Donacilla, Gray, 1851.) 
Shell oblong, Donaciform; posteriorly short, cuneiform, trun- 
cate; two lateral teeth in one valve. IZ. donacina, Linn. 
(exi, 58-60). 
PALZOM@RA, Stolicz., 1870. Shell elongated, hinder part 
shorter, the upper declivity slightly convex, posterior end sub- 
truncate, beaks directed forwards; ligament situated on thickened 
but not prominent fulcra;, hinge with one anterior, long, lamelli- 
form tooth in each valve, bifid in the right, single in the left 
valve, posterior cardinal tooth not distinctly traceable in either 
valve; laterals less distinct in the left valve. This is based upon 
the cretaceous Tellina strigata of Goldfuss. In form it very 
much resembles Meera, but the hinge presents some marked 
differences, as noted above. 
LINEARIA, Conrad, 1860. (Liothyris,Conr.) Shell elongated, 
sometimes roundish, not peculiarly thick, rounded on both ends, 
surface partially or wholly radiately ribbed, posteriorly not, or 
very indistinctly flexuous; anterior cardinal teeth on both valves 
elongated, bifid, much smaller in the left valve; posterior car- 
dinal small, but larger in the left than in the right; lateral teeth 
much thinner in the left than in the right valve, sometimes almost 
obsolete in the former. This ought to include a large number 
of fossil species which have been described as Arcopagie ; the 
want of posterior flexure or plicature and the usual radiate rib- 
bings near the terminations of the shell particularly characterize 
