CATALOGUE—SHELLS. 551 
Habitat ad oras insule Tierra del Fuego et in freto Magellanico. 
Mus. Brit., nost., Brod. 
Shell oblong-ovate, and generally of a chestnut red, and the 
granulose ligament black ; the colour of the younger specimens 
is more brilliant, and sometimes interspersed with yellow. Middle 
valves slightly toothed, and very delicately lineated, the lines 
forming an obtuse angle in the direction of the axis of the shell ; 
the lateral compartments are marked with deeper strizea or grooves, 
radiating from the upper angle to the base, which, crossing the 
transverse markings of the valve, have a reticulated appearance : 
the anterior and posterior valves are radiated with fine lines. 
This Chiton was discovered by Mr. Bowen, surgeon of the 
Beagle, by whom it was presented to me. The specimen was 
sent home among a collection of Natural History, transmitted in 
the year 1827. 
22, FissuRELLA COARCTATA. 
F. testd ovata, anticé attenuatd, elevatd ; radiis frequentibus elevatis ; 
interné virescenti ; foraminis margine externo juxta medium coarc- 
tato, subdentato ; long 2, ; lat. 148; alt.4¢; poll. 
Habitat ad Portum Praya. Mus. Brit., nost. 
23. HELIX TRANSLUCENS. 
H. testd subglobosd, translucente, levissimé transversim  striatd ; 
anfractu basali lined longitudinali castaned sub«medid ornato ; 
long. 3% 3 lat. 8. ; poll. 
Habitat ad Rio de Janeiro, Mus. Brit., nost., Brod. 
24. Heix puso. 
H. testd rotundo-complanatd, creberrimé striatd, translucente, maculis 
castaneo-rujis ornatd ; long. +!,3 lat. 8, ; poll. 
Habitat ad Juan Fernandez. Mus. Brit., nost., Brod. 
25. HELICINA SORDIDA. 
H., testd globoso-conoided ; anfractibus rotundatis longitudinaliter 
striatis ; operculo castaneo ; long.% paulo plus; lat %, paulo 
plus ; poll. 
Habitat ad Rio de Janeiro. Mus. Brit., nost. 
The colour of this shell is of a dirty yellowish white, with 
a slight tinge of diaphanous violet within the margin of the lip. 
26. Pura susp1ArpHana.—No. 194. MSS. 
P. testd cylindraced, albd, subdiaphand, transversim creberrimé sub- 
striatd ; long, * paulo minus ; lat. 3, paulo minus ; poll. 
