TRIBE NYMPHACEA. 73 
with the umbones darker : ligament large : cardinal teeth small, no 
lateral ones. 1951 9.— Arctic Ocean. 
TELLINIDES. 
Transverse, inequilateral, flattened, a little gaping laterally ; 
beaks small and sub-depressed: no anterior irregular plait ; 
two divergent primary teeth in each valve, and two lateral teeth, 
which are somewhat obsolete; the posterior one approximate in 
one valve. 
T. Trmorensis. Lam. 1.—Reeve. t. 56. f. 2.—Sonw. G.— 
Tevuina Nivea. Wood. G. C. t. 46. f.1.2—D. p. 89..—W. t. 4. 
f-62.? Oval elliptic with the anterior side rather longer narrower and 
obtusely truncated at the tip, white and but little convex, marked 
with concentric strize and the ventral margin sindulated. 13.—Near 
Timor.? 
T. Truncatutus. Sow. Tank. Cat. Oblong, anteriorly slightly 
shorter, sub-attenuated and obtusely angulated, posteriorly rounded, 
the ventral edge little arcuated; smooth, glossy, sub-irridescent, 
pellucid, sub-equivalve, convex. +#..13.—. Indies. 
T. Opatina.—Tewiina O. Ch. f. 107.—Gmel. p. 3236.—W. 
t. 4. f. 41. Sub-ovate, posteriorly rather shorter and rounded, ante- 
riorly obtusely sub-cuneiform, sloping uninterruptedly from the ar- 
cuatedligamental edge to the ventral which is sub-incurved anteriorly, 
compressed, thin, white more or less opaline, nearly smooth; the 
flatter valve with an internal oblique radiating rib.—Variety. 
Rose colour. T. Rosea. Sow. G. f. 1.—eeve t. 56. f. 1. 1.. 14. 
— Nicobar. 
T. Ovautis. Son. Tank. Oval, rounded at both ends, smooth, 
inequivalve, anteriorly rather shorter and narrower ; thin, rather 
compressed, pink with narrow_white rays: a solid bifid cardinal 
tooth in one valve, an approximate lateral tooth with rudimentary 
cardinal in the other. 
T. Acuminatus. Very inequivalve, very inequilateral, oblong, 
anterior side cuneiform and twice as long as the rounded posterior : 
white with usually an orange tinge on the discs, thin, polished, 
smooth except on the posterior slope where the strize of growth are 

1 See also the Inruata of Chemnitz (W. t. 3. f. 9.) whose figure 
we have copied, but are unable to identify the shell. 
2J have almost confined myself to a description of the species 
enumerated by Mr. Sowerby, in a genus whose institution almost 
every writer has condemned. Many, however, of the Tellens at the 
close of the first division, have perhaps an equal right to be included 
in this genus. 
