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fusco-variis ; marginibus ventralibus acute dentatis : hng. 1"75, 

 lat. 1", alt. llb poli. 

 Hab. ad Sanctam Elenam et ad Salango, Columbiae Occidentalis. 

 Found in sandy mud at from six to ten fathoms. — G. B. S. 



Pecten circularis. Pect. testd suborbiculari, tumidd, subceguivalvi, 

 <equUaternli, ftisco alboque varid, auriculis magnis, sub<equalibus ; 

 costis radiantihus octodecim interstitiis lationbus,arcuatim striatis; 

 valvd alterd svlcis profundioribus : long. 1"5, lat. 0'8, alt. l'ėpoll. 



Hab. ad Sinum Califomise. (Guaymas.) 



Found in sandy mud at a depth of seven fathoms. — G. B. S. 



Pecten asperstjs. Pect. testd suborbiculari, depressiusculd, sub- 

 {Bquivalvi, (Equilaterali, auriculis incequalibus , dextrd majusculd ; 

 valvarum alterd radiatim costatd, pallescente seu albd, costis qua- 

 tuordecim majoribus, rotundatis, leevibus, alterd radiatim costatd, 

 costis quindecim acutioribus, fuscis, punctuUs ceerulescentibus 

 aspersis, interstitiis tenuissime transversim striatis, pallescentibus: 

 long. 1'4, lat. O'o, alt. 13 poli. 



Hab. ad Tumbez, Peruviae. 



Dredged in soft mud at a depth of five fathoms. This species has 

 sometimes a few irregular blotches of white sprinkled over the darker 

 coloured valve. — G. B. S. 



L , Pecten spinifertjs. Pect. testd subovatd, depressiusculd, sub<equi- 

 1 } \}-\ valvi, cequilaterali, auriculis inaqualibus, sinistrd majore ; valvis 

 radiatim costatis, costis utriusque novem, latis, squamuliferis , 

 squamulis fimbriatis ; valvce alterius marginibus dorsali, antico, 

 posticoque spiniferis : long. 9, lat. 0'25, alt. 0'9. 

 Hab. ad Insulam Lord Hood's dictam, Oceani Pacifici. 

 A single specimen of this beautiful little shell ■was taken on the 

 reefs in coral sand. — G. B. S. 



Pecten parvus. Pect. testd subovatd, depressiusculd, suhcequivalvi, 

 •j^ cequilaterali, albicante, auriculis in(equalibus, grani/eris ; valvis 



radiatim costatis, costis octo in<Equalibus, transversim striatis ; 



interstitiis radiatim sulcatis et transversim striatis : long. 07, lat. 



0-25, alt. 0-8 poli. 

 Hab. ad Insulam Lord Hood's dictam, Oceani Pacifici. 

 Found in coral sand on the reefs. — G. B. S. 



Genus Xylophaga. 



Xylophaga globosa. Xyl. testd globosd, margine dorsali postico 

 declivi, valvis accessoriis majusculis : long. 0'4, lat. 0'35, alt. 0"35 

 poli. 

 Hab. ad Valparaiso. 



Found in a piece of wood dredged from a depth of a hundred 

 fathoms. — G. B. S. 



