Soeur US: 
Puate I. 
Genus SCUTUS, Montfort. 
Testa oblonga, scutiformis, subsymmetricd ; apice dorsal, 
oblique verstts marginem posticum inclinato, aper- 
ture margine integro, anticé sinuato ; impressione 
musculari oblonga, postice semicirculari, anticé inter- 
rupta. 
Shell oblong, scutiform, subsymmetrical; apex dorsal, 
obliquely inclined towards the posterior margin, 
margin of the aperture entire, sinuated in front; 
muscular impression oblong, posteriorly semicir- _ 
cular, anteriorly interrupted. 
Parmophorus. Lamarck. 
The shell forms the dorsal shield of a large gastro- 
The largest 
species and two others are Australian; one is from 
Madagascar and one from the Philippines. The shells 
of this genus can only be confounded with those of one 
other genus, namely, Zugalia, which has the margin 
toothed while that of Scutus is entire. 
podous molluse which it does not cover. 

June, 
| THE ELONGATED Scurtus. 

Species 1. (f 1, 2, Mus. Sowb. 3, 4, Mus. Cuming.) 
Scurus ELone@atus. Sc. testd oblongd, laevigata, subar- 
cuata, antice rotundatd inflata, concentricé subun- 
dulatad, intus, inter marginem et apicem aurantio 
concentrice interruptim fasciatd ; apice retrorso, 
lateribus compressis, rectiusculis, marginibus sub- 
parallelibus ; margine antico laté sinuato. 
Shell oblong, smooth, some- 
what arched, rounded and inflated in front, con- 
centrically slightly undulated, within, between the 
margin and apex concentrically, interruptedly 
banded with orange, apex far back, sides com- 
pressed, rather straight, with nearly parallel 
margins ; anterior margin widely sinuated. 
BiatnviLie. Bulletin des Sciences, Fev. 1817, p. 28. 
Parmophorus Australis. Lamarck. 
Parmophorus levis. (var.) Blainville. 
Scutus angustatus. (var.) A. Adams. 
The concentric lines of growth on the surface of this 
species are undulated so as to form softly shining rays 
towards the margin excepting towards the front, in 
which they are only sinuated centrally. 
1870. 
