1864.] | MESSRS. ADAMS AND ANGAS ON NEW SHELLS. 39 
carinato ; apertura patula, peritremate late dilatato et reflexo, 
regione umbilicali excavata. 
Long. 73 lines, lat. 9 lines. 
Hab. New Ireland (Coll. Angas.). 
A larger species than L. panayense, Sow., which it somewhat 
resembles in form. The last whorl is very strongly carinated at the 
periphery, and the peritreme is not dark-coloured. We have named 
the species in compliment to Dr. Dohrn, who has made the opercu- 
lated land-shells an especial object of study. 
16. Paysa rnriata, Ad. & Ang. 
P. testa oblongo-ovata, umbilicata, tenui, semipellucida, viridi- 
cornea, anfractibus supremis fuscis opacis, epidermide pilosa 
obtecta, pilis in lineis transversis dispositis ; anfractibus 4, 
valde convexis, longitudinaliter striatis et lineis transversis 
equidistantibus punctatis instructis, anfractu ultimo magno 
ventricoso inflato; apertura ovata; labio late reflexo, umbilicum 
obtegente ; labro simplict. 
Long. 8 lines, lat. 6 lines. 
Hab. Wakefield River, South Australia (Coll. Angas.). 
A fine inflated bulbous species with the upper whorls usually semi- 
opake and fuscous, and the lower whorls more pellucid and of a 
pale greenish horn-colour. The epidermis is ornamented with re- 
gular transverse rows of short hairs. ; 
17. THECALIA MACROTHECA, Ad. & Ang. 
T. testa oblonga, perinequilaterali, pallide carnea, epidermide 
fulva tenui induta, radiatim valde costata, costis nodoso-squa- 
mosis, latere antico brevissimo subauriculato, postico longiore 
dilatato ad extremitatem rotundato, margine ventralt antice 
sinuato et crenato, theca interna magna infundibuliform ; 
apertura ovata, expansa. 
Alt. 4 lines, lat. 6 lines. 
Hab. Rapid Bay, South Australia (Coll. Angas.). 
The cup-shaped appendage is much larger in the female, which 
in the Cape species is frequently found filled with ova. In the male 
of Thecalia concamerata which we have examined, the ventral margin 
is also folded on itself; but the cup is much narrower, and appears 
never to contain any ova. 
18. Unto (Atasmopon) rvansi, Ad. & Ang. 
U. testa transversim ovata, compressa, tenui, viridi-olivacea, ad 
umbones pallidiore, umbonibus vie erosis, concentrice crebre 
plicata, lirulis duabus subnodulosis radiantibus ornata ; latere 
antico parvo et rotundato, postico dilatato et oblique truncato, 
margine ventrali valde arcuato. 
Alt. 14 inch, lat. 2 inches 3 lines. 
Hab. Lagoon of the Lower Murray River (Coll. Angas.). 
