1865. ] MR. G. F. ANGAS ON NEW BIVALVE SHELLS. 697 
Although bearing considerable resemblance to the widely umbili- 
cated and more coarsely sculptured H. juloidea, yet its nearest ally 
is H. sericulata, a smaller, more delicate, and more finely ribbed 
species. 
VITRINA PLANILABRIS. 
V. testa auriformi, valde depressa, tenui, translucente, polita, 
epidermide olivaceo-viridi induta, leviter striata et (sub lente) 
lineolis paucis depressis spiralibus ; spira pusilla, vix promi- 
nente, nucleo albido; anfractibus tribus, ultimo peramplo, pla- 
nato, exterius convexo; apertura lunato-ovata, intus margari- 
tacea, peristomate tenui, margine columellari pertenui, plano, 
externe carinato. 
Diam. maj. 0°80, min. 0°50, alt. 0°26, apert. 0°55 x 0°42 une. 
Hab. Mitchell River, New South Wales (Porter); Urara River, 
New South Wales (Macgillivray). 
A large and much depressed species, easily distinguished by the 
flatness of the base of the shell along the inner lip. The animal 
when disturbed exhibits and exudes a purple dye. Young shells 
show greater tumidity of the body-whorl. 
9. Descriptions or Two New Species or Marine Brvatve 
SHELLs rrom Soutu Avustratia. By GrorGE FrencH 
Aneas, C.M.Z.S. 
1. Barsatra (AcAR) LAMINATA. 
B. testa subcylindraceo-oblonga, inequilaterali, latere antico bre- 
viore rotundato, postico elongato, superne subangulato ; albida, 
epidermide vix nulla ; concentrice jimbriato-costata, interstitiis 
valde excavatis ; umbonibus tumidis, subdistantibus ; ligamenti 
area angusta, subdeclivi. 
Long. 15 lin., alt. 7 lin. 
Hab. St. Vincent’s Gulf, South Australia (Coll. Angas). 
This shell most nearly resembles A. sguamosa, Lam., but is more 
elongate and cylindrical, with the umbones tumid and more distant. 
The sculpture of the concentric ribs consists of a series of hollow 
frills, whereas in the allied species it is always solid and tubercular. 
2. SPISULA ADELAIDE. 
S. testa ovata, subcompressa, subsolida, albida, epidermide pal- 
lido-fulva induta ; subequilaterali, latere antico paulo breviore 
subrotundato, latere postico subacuminato ; margine ventrali 
convexo, dorsali antice rotundato, postice subcompresso, ar- 
cuato et superne obtuse angulato. 
Long. 9 lin., alt. 74 lin. 
Hab. In muddy estuaries, Port Adelaide Creek, St. Vincent’s 
Gulf, South Australia (Coll. Angas). 
