Cirrhipeda, Conchi/ern, 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 striae 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 Hues. 



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, antice attenuatd, elevatd ; radiis frequentibus elevatis : 

 interne virescenti ; foraminis margine externa juxta medium coarc- 

 tato, subdentato ; long. 2y%; lat. \\~', alt. -fi; poll. 

 Habitat ad Portum Praya. Mas. Brit., nost. 



23. Helix translucens. 



//. testd subglobosd, translucente, levissinie transversim striatd; 

 anfractu basali lined longitudinali castaned sub-medid ornato; long. 

 J-t; lat.-f-^; poll. 

 Habitat ad Rio de Janeiro. Mus. Brit., nost., Brod. 



24. Helix pusio. 



H. testd rotundo-complanatd, creberrime striatd, translucente, maculis 

 castaneo-rujis ornatd; long, y'^ ; lat. f'o '> poll. 

 Habitat ad Juan Fernandez. Mus. Brit., nost., Brod. 



25, Helicina sordida. 

 H. testd globoso-conoided ; anfractibus rotundatis longitiidinaliter stri- 



atis ; opcrculo castaneo ; long. \ paulo plus ; lat. f*g paulo plus; 



poll. 



Habitat ad Rio de Janeiro. Mus. Brit., nost. 



The colour of this shell is of a dirty yellowish white, vnth a slight 

 tinge of diaphanous violet within the margin of the lip. 



