Cirrhipeda, Conchifera,and Mollusca. 339 
Shell oblong-ovate, and generally of a chestnut red, and the granu- 
lose ligament black ; the colour of the younger specimens is more bril- 
liant, 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 striz 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 ovatd, anticé attenuatd, elevatd; radiis frequentibus elevatis ; 
interne virescenti; foraminis margine externo juxta medium coarc- 
tato, subdentato ; long. 2;5;; lat. 144; alt. 14; poll. 
Habitat ad Portum Praya, Mus. Brit., nost. 
23, HELIX TRANSLUCENS. 
H. testé subglobosd, translucente, levissimée transversim _ striata; 
anfractu basali lined longitudinali. castaned sub-medid ornato; long. 
44; lat. ;; poll. 
Habitat ad Rio de Janeiro. Mus, Brit., nost., Brod. 
24, HELIX PUSIO. 
H. testd rotundo-complanatd, creberrimé striata, translucente, maculis 
castaneo-rufis ornatd; long. 75; lat. 3°; ; poll. 
Habitat ad Juan Fernandez. Mus. Brit., nost., Brod. 
25. HELICINA SORDIDA, 
H, testé globoso-conoided ; anfractibus rotundatis longitudinaliter stri- 
atis ; 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. 
