from the West Coast of North America. 179 



160. Pecten (? var.) cequisulcatus. 



P. testa P. ventricoso simili, sed tenuiore, minus ventricosa ; costis 

 pluribus angustioribus xx.-xxi. ; interstitiis (prsecipue valva su- 

 periore) fere eequalibus ; auriculis magis productis, acutis ; sinu 

 serrato : testa jun. interstitiis alte insculptis, laminis concentricis 

 crebris, vix extantibus, interstitia, costas auriculasque transeunti- 

 bus. Long. 3-2, lat. 3-35, alt. 1-5. 



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

 Cooper). 



Intermediate between the tropical P. ventricosus and the 

 Atlantic P. irradians. 



161. Pecten paucicostatus. 



P. testa subconvexa, vix sequilaterali ; castaneo seu rubido seu elec- 

 trino picta ; costis xi.-xv., validis, angustis, rotundatis ; inter- 

 stitiis multo latioribus, subplanatis ; tota superficie minutissime 

 concentrice striata ; auriculis latis, haud sequalibus, lirulis circ. vi. 

 ornatis ; sinu paucidentato : intus pallidiore, linea cardinis cos- 

 tata, ad suturas auricularum tuberculosa ; fossa ligamentali curta, 

 transversim lata. Long. 1'7, lat. 1'84, alt. '56. 



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 interstitiis sequalibus ; costis et interstitiis regulariter un- 

 datis, striis crebris squamosis radiantibus ubique ornata ; auriculis 

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

 postica sinuata; auriculis ambabus et regione contigua scabrose 

 striatis : intus alba, linea cardinali alte sulcata. Long. 1*82, 

 lat. 179, alt. -9. 



Hab. " Sta. Barbara," teste Jewett. 



Resembles a shell in Mus. 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, marginibus fere parallelis ; antice satis effusa, 

 postice subito angustata ; canali brevissimo ; labro acuto ; labio 

 indistincto ; plica columellari parva, valde declivi. Long. • 1 7, 

 lat. -07. 



Hab. Sta. Barbara (/ewje^/). 



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



P. testa P. comptce simili, sed elatiore ; suturis impressis ; anfractibus 



12* 



