ee lNGA.: 
Puare XXIII. 
Species 119. (Fig. a, 4, Mus. Taylor.) 
TELLINA UNDULATA. Tel. testd oblongd, tenui, pallidis- 
sime fulvd, compressa, lateraliter posticé arcuatd, cos- 
tellis undulatis, obliquis, vie concentricis, liratd ; la- 
tere postico brevi, contracto, angulato, termino trun- 
cato, margine dorsalo recti, declivi, ventrali oblique 
acclivi ; latere antico amplo, oblongo, margine dorsali 
rectiusculo, margine ventrali convewo, umbonibus par- 
vis, acutis, dentibus lateralibus nullis. 
THE UNDULATED TELLINA. 
pale fawn, compressed, laterally curved behind, 
ridged with undulating, oblique, scarcely concentric 
Shell oblong, thin, very 
ribs; posterior side short, narrowed, angular, trun- 
cated at the end, dorsal margin straight, sloping, 
ventral margin obliquely sloping upwards; anterior 
side full, oblong, dorsal margin straight, ventral mar- 
gin convex, umboes small, sharp, no lateral teeth. 
Haniszy, Pro. Zool. Soc. 1844; Thes. Conch. Tellina, 
£107: 
Hab. St. Elena, West Columbia. 
This wonderful little shell is remarkably curved poste- 
riorly, and the ridges are oblique at the posterior fold 
only, partially following the direction of the lines of 
growth. 

Species 120. (Fig. a, 6, Mus. M‘Andrew.) 
TELLINA TUMIDA. Tel. testd parva, brevi, alba, subtri- 
gond, concentricé minutissime sublaminatim liratd, 
valvuld dextrad subdepressd, valvuld sinistrad tumida ; 
latere postico brevi, angulato, valde declivi, termino 
truncato, margine ventrali ante angulum sinuato ; la- 
tere antico supra declivi, infra valde convexo, umboni- 
bus acutis, dentibus lateralibus nullis. 
THe TUMID TELLINA. Shell small, short, white, subtri- 
gonal, concentrically very minutely laminately ridged, 
right valve rather depressed, left valve tumid ; pos- 
terior side short, angular, very sloping, truncated at 
the end, ventral margin sinuated in front of the 
angle; anterior side sloping above, very convex be- 
neath, umboes sharp, no lateral teeth. 
SOWERBY. 
Hab. Jamaica. 
A small shell belonging to the Ostracea group, remark- 
able for the unequal depth of its valves. 

Species 121. (Fig. a, 6, Mus. Sowerby.) 
TELLINA PERPLREXA. 
pressa, sordidé alba, concentrice equaliter crebre stri- 
Tel. testé ovali-subtrigond, com- 
ata ; latere postice acuminato, acute angulatim costa- 
to, post angulum depresso, margine dorsali recto, de- 
elivi, termino truncato, margine ventrali ante angulum 
contracto, sursum acclivi ; latere antico expanso, ro- 
tundo, margine dorsali prope umbones concavo, mar- 
gine ventrali rotundo, umbonibus parvis, concentricé 
laminatim liratis. 
THE DIFFICULT TELLINA. 
pressed, dull white, concentrically equally closely 
striated; posterior side acuminated, sharply angular- 
Shell oval-subtrigonal, com- 
ly ribbed, depressed behind the angle, dorsal margin 
straight, sloping, truncated at the end, ventral mar- 
gin contracted in front of the angle, sloping up- 
wards; anterior side expanded, round, dorsal mar- 
gin concave near the umboes, ventral margin round, 
umboes small, concentrically laminately ridged. 
Han .ey, Pro. Zool. 1844; Thes. Conch. Tellina, f. 138. 
Tellina concinna ?, Philippi. 
Hab. Bay of Manilla and Island of Annaa, 
The form of this species is more decided as to the ex- 
pansion of the front part than that of Zed/ina ostracea ; 
the posterior rib is sharper, and the concentric ridges 
are finer and more equal. 

Species 122. (Mus. M‘Andrew.) 
TeLuina M‘Anpret. Tel. testd aurantio-rosed, oblonga, 
tenut, levigatd, compressa, inequilaterali, valvuld si- 
nistrd medio et antice obliqué sulcatd ; latere postico 
brevi, late truncuto, obscuré radiatim angulato, area 
postangulari concentrice liratd, margine dorsali recto, 
declivi, margine ventrali vir acclivi ; latere antico ob- 
longo, margine ventrali rectiusculo. 
M‘Anprew Teiiina. Shell orange-rose, oblong, 
thin, smooth, compressed, inequilateral, left valve 
obliquely suleated in the centre and front; posterior 
THE 
side short, widely truncated, obscurely radiately an- 
cular, postangular area concentrically ridged, dorsal 
margin straight, sloping, ventral margin scarcely 
sloping upwards; anterior side oblong, ventral mar- 
gin rather straight. 
SOWERBY. 
Hab. Madeira. 
March, 1867. 
