from the TFesi Coast of North America. 3 



crehris, vix extantihus, interstltia, costas auriculasque transeunti- 

 lius. Long. 3'2, lat. 3*35, alt. l*o. 



Hab. Sta. Barbara {Jewett) ; S.Diego {Cassidy, Newberry, 

 Cooper). 



Intermediate between the tropical P. ventricosus and the 

 Atlautic P. irradinns. 



161. Pecten fanncostatus. 



P. testa snbconvpxa, vix pequilaierali ; cas^aneo seu rubido seu elec- 

 trir.' i f ji;ta ; costis xi.-xv., validis, angustis, rotundatis ; inter- 

 stir iis multo latioribus, subpianatis ; tota superficie minutissiine 

 coucentrice striata ; auriculis latis, hand secpialibus, liruUs circ. vi. 

 oniatis ; sinu paucidentato ; intus pallidiore, bnea cardinis cos- 

 tata, ad sutiiras auricularum tuberculosa ; fossa ligamentali curta, 

 trausversim lata. Long. 1*7, lat. 184, alt. 'bQ. 



Hab. Sta. Barbara {Jewett)', Sta. Barbara Island {Cooper). 



Pecten (? var.) squarrosus. (Page 536.) 



P. testa orbiculari.sequilaterali, rubida, albido maculata ; valva dextra 

 convexa , costis xviii., sequalibus, testa jun. approximatis, testa 

 adulta iiiterstitiis eequalibus ; costis et interstitiis regulariter un- 

 datis, striis crebris squamosis rr.di^ntibus ubioue ornata ; auriculis 

 magnis, latissimis, subsequalibus : antica anguste fissata, serrata, 

 postica sinuata ; auriculis anibabus et regione contigua scabrose 

 6triatis : intus alba, linea cardinali alte sulcata. Long. r82, 

 lat. 1-/9, alt. -9. 



Hab. " Sta. Barbara," teste Jewett. 



Resembles a shell in ]\Ius. Cuming., marked " exasperatus, 

 var.," but does not agree with the diagnosis of that species. 

 All Col. Jewett's valves were dextral. The locality needs con- 

 firmation. 



183. Volvula cylindrica. 



V. testa cylindracea, alba, nitente, striis spiralibus distantibus cincta ; 

 medio planato, niarginibus fere parallelis ; antice satis effusa, 

 postice subito angustata ; canali brevissimo ; labro acuto ; labio 

 indistincto ; plica coluuiellari parva, valde declivi. Long, 'l", 

 lat. -07. 



Hab. Sta. Barbara (Jt'/t^e//). 



265. Phasianella (? cornpta, var.) punctulata. 



P. testa P. compt(E siniili, sed elatiore; suturis impressis ; anfractibus 

 tumentibus ; omnino minutissime fusco punctata; coluniella lacix- 

 rata. Long. '24, long. spir. "12, lat. '14, div. 50°. 



Hab. S. Diego {Jewett), 



281 



