iS 



Hab. in Columbia Occidentali. 



Found under stones at the Isle of Plata. — G. B. S. 



Byssoarca DivARiCATA. Bt/ss. lestu oblongd, alljicante, longitu- 

 (linaliler sukata et radiatim decussatd ; latere aniico superue 

 subangulato, postico carind ex vmbone ad marginėm ventralem 

 poUicam decitr rentė spinįferu, suleis divnricatis, elegnnter decus- 

 satis conspicuo ; arei ligamenti angusta : long. T, lat. 0'5, alt. 

 0'55 poli. 

 Hab. ad littora insularum Maris Pacifici. (Annaa or Chain 

 Island.) 



Found attached to stones. — G. B. S. 



Byssoarca decussata. Bj/ss. testd oldongu, albd, decussatbn sir'iald , 

 epidennide squamoso-setosd indutd ; Intere aniico breviore, superne 

 subangulato; postico superne rolundato-angnlalo, injra ratun- 

 d(do į margine veiilrali rectiusculd ; ared ligamenti atigustd : 

 long. 2; lat. V, alt. \ -2 poli. 

 Hat), ad littora insularum Oceani Pacifici. 



Found attached to Molher-of-pearl Shells at Lord Hood's and 

 Chain Islands.— G. B, S. 



Byssoarca illota. Bi/ss. testd ovatd, albd, radiatim costatii, 

 costis numerosis, decussatis ; epidermide fuscd, foUaced mdutd ; 

 latere antico breviore, rotundato, postico declivi ; area ligamenti 

 angustd, brevi : long. 1"5, lat. 07 5, alt. ]• poli. 

 Hab. in America Centrali. 

 Found under stones in the Gulf of Nocoiyo. — G. B. S. 



Byssoarca velata. Bį/ss. testd ovalą, compressiusculd, radiatim 

 costatd et decussatd ; dorso bianguhto ; epidermide foscd , squa- 

 mosd, sguamis acuminatis ; ared ligamenti angustd: Ivng. 3'1, 

 lat. 1-8, alt. I- poli. 

 Hab. ad littora insularum Oceani Pacifici. 



Found attached to Mother-of-pearl Shells at Lord Hood's and 

 Chain Islands. One specimen is Ginches long. — G. B. S. 



Byssoarca soliua. Bi/ss. testd orato-quadratū, crassd, solidd, 

 a'cjuilaterali, radiatim striatd, minutissimi decussatd ; latere an- 

 tico rotundato, postico superne ohtuse angulato, obsolete carinato ; 

 ared ligamenti elongatd, ligamento rhomboideo, centrali: long. 

 OG, lat. 0-5, uit. 0-4 poli. 



Hab. ad Paytam, Peruvije. 



'^ound under stones. — G. B. S. 



Byssoarca pusilla. Bį/ss, testd ovato-sitbrhomboidali, albidd, 

 decussatd ; latere antico breviore, rotundato, postico longiore, de- 

 clivi ; margine dorsali posticd angulatd ; ared ligamenti angustd; 

 ligamento brevi, ad posticam arece partem solian adjtincto ; carind 

 obtusd ex umbone ad marginėm posticam iriferiorcm decurrente : 

 long. 4-5, lat. 02, alt. 0-25 poli. 



