ON MOLLTTSCA OF THE WEST COAST OF J.'ORTH AMERICA. 537 



P";e. Sp. 



I,j2 8. Sj)ir '</li/j)iiu^ (ilUdun, ?C^T. yiA7.At\a.n, Eeigen. Operculum ^r et ?/, Maz. 

 Cat. p. •'>l\.=I}ii:niiut alhifla. Cpr., Maz. Cat. p. ;307. Operc. y is with- 

 out doubt ijf lS/)iruff'i/p/ius, and not of liivotiia, var. indentata. Uperc. / 

 is truly coufrfne'.-ic, and perhaps conspt'citic. 

 344 4. Vertni'fus (^'I'/tj/luciKlii-:) roiitortits, Cpr* Gulf Calif. Mus. Cum. 

 ., .. Var. (1. repfii<(Tn!ihicodii-i). GulfCa'.if., on Mar i/arif if era, ^lus. Cum, 

 " This .species is perliap.s a state of V. (Petalocoiichus) nutcrophray- 

 mn." [Morch : uon Cpr.jt 

 S45 ., \&r.lii. favosa (Thylacoduf). C?i\.\i., an Ontcibidum. Mus. Cum. 

 . , , , Var. y. coiitortidn { T/i;//acodui). Gulf of California. 

 ,, ., Forniii 1. 'rT/ti/lucttdus contortm, var. indent af a, Cpr. '•Corre- 



sponds to forma \,tli'ctriint. of Vermetus cariaiis, IVOrb." 



• . •• Var. 8. )'//f/<'w^<//« ( rM-wjc^M*), [Morch,non Cpr.]. Sonsouate, on <^;on- 



dylus limbntus, live., iion Sby. Oersted. 

 346 . . Var. *. orrodens ( Vermttus). Is. Sibo (PQuibo), Spengler, on Ptii' 



pura Uneata. 

 359 20. Vermdm (Yr Strehlnre^-as) anelhim, Morch. California, on Haliotis tuher- 

 adatu^, li\e. [Not a Californian JLdiotis. The diafj;nosi.s, howevt"*, 

 exactly accords with a Californian shell, which is perhaps the young of 

 S. sqiiaviiz/erifs. It has no resemblance to Slrebloceras, Cpr., P. Z. S, 

 1858, p. 440, wliich is a p^enuine Ciecid.] 

 860 21. Vermetus (Mucrophrai/nta) maen>phragina. Mazatlan, Szc.=iPelaloconchi.8 



in., Cpr. Itealejo, Oersted. 

 362 24. Vermetus (Ah-tes) centiqitadrus, Val. Puntarenas, Oersted -\-V. effusus, 

 Val. (the ."^ame .specimen). 

 ,. ,. Var. u. miixima=\'. l\inamensis,C\iexi.^\.?).i.\. Panama, C. .B. -4rf. ; 

 Mazat'an. Melchers. 

 ,, Var. (i. Piinctis impressis destiluta,s=V. Peronii,\fi\.X 

 303 .. Var. y. siphonuta. Puntarenas, Oersted=V. Peronii, ..ouss. 



Var. 8. tii'ipn. tiulf of California, on piece of black Pinna, Mus. Cum* 

 [The Pinna niijrina is from the E. !•]= V. ttdipa, Kuuss. 

 • . . . Var. €. liiidyesii. Panama, on Margaritifera, Mus. Cum. 



The conclusion of the paper is in P. Z. S. 1862, pp. 54-83. 



58 4. Bivoniu suHlis, Miirch. Central America, on Anomalocardia subimhrirata, 



Mus. Cum. 

 ,. . . Var. at. 'miiijir. On Pinna, probably Central America, ^fu?. Dunker. 

 ,. ,. Var. /3. triquetra. Mazatlan, on valve oi Placuuunomia, Mus. Semper. 



Like B. triquetra, " var. ti/pica." 

 70 8. Thyhtcodes crueiformis, Moi'ch. California, on Crueihdum ? umbrella, 



Desh., var. Mus. Cum. Analogue of 7, T. Riisei, Miirch, from the 



east coast. 

 , , , . Var. «. lumbriceUa. Voy. Ven. pi. 11. f. 2. California, crowded on 



Maryaritifera. Mus. Cum. 



• • •• Var. ji. eryfhosclera. Cal., on young Margaritifera. IMus. Cun\ 



^Vrv like Jiir. Quoyi, var. variegata. [This species is on shells iron 

 tiie Mexican, not the "Californian" fauua.l 

 76 16. Thylaeixles squnmiyera, CpT.,=^Aletessq.,Q'pv.,V.Z.^.\^^,^.22fj. Sta. 

 Biu'bara, Nutt. [Serpulurbis, not Aletes, teste Cooperl. 



* Mr. Miirch has not seen any lamince inside, but, from the 3-5 spiral lirae on the 

 cohunella, believes tliey will be toimd. The opercula supposed to belong to this sipeci s 

 (Maz. Cat. p. 311) Mr. M. thinks more probably those of Spiroglyphus allidwi. lie 

 staies (erroneou: ly) that the shell was not opened by the describer. 



t Miirch supposes that Bivonia contorta, Cpr., may be the adult of Petaloconclms 

 fnaerophrayma, and that both may be forms of Aletes ceniiquadrus. The nuclear por- 

 tions are, however, quite distinct, and the three shells appear, from beginning to end, as 

 far removed as any ordinary Vernietids can be from eaeh other. 



X The writer doubts respectunj this species, and thinks tlie shell on whieh it is para- 

 sitical to be a Melo, and ujt UliQiiibus galea, simply bcuause uaiued after J^erou, wito 

 did not ribit this distnul. 



43 



