— 3i — 



njtes) Desh. — V. dextra rarissime libera, plerumque Cyprinac 

 |. Oculinae adnata. Sinus non nisi deformitate clausus, profun- 

 dus, angustus, margine pectinatus. Boh. — Bergen. 



232. P. septemradiatus Muell., (Ostrea) G.\i., = P. triradiatus 

 Muell. = P. danicus Ghemn., Sow. , = P. pseudamusium Ghemn. 

 (sub 0. hybrida Gm. subsumta;, = P. adspersus Lamk. , Desh. = 

 P. nebulosus Bp.own. — Striae jam tenuissimas, jam notabiies; 

 plicae 5 — 10, saepius 7 — 8, rotundatae J. acufae; sinus parum 

 profundus, vix acutus. KuJlen — Bergen. 



233. P. tigrinus Muell. , Desh. = P. parvus DaC. = P. obsoletus 

 Penn., Angl. = Chemn. XI f. 2031 — 2036. — T. convexa, al- 

 tior quam ionga, soiiduia; pJicae 3, 5 obsoletae, costeJlae nume- 

 rosae, supra medium rarissime distinguendae; scuJptura e striis 

 subtilissimis arcuatim divergenlibus, undulatis, gyrosis; auriculae 

 posteriores anticis dimidio breviores; margo cardinalis dimid. t. 

 Jongitud. vix aequans; ^tt- 'j^ 9 , {f;f mm. Boh. — Finm. 



234. P. furtivus n., an = 0. Jaevis Mont. , Mat. et Rack. ? (non 

 Penn.) — T. parum convexa, tenuis, aeque alta ac longa; pJicae 

 nuilue, costeJJae nuilae nisi ad latera, ubi interdum 5,6 Jineares, 

 squamosae; scuJptura qualis in priore subtiiissima e striis sub- 

 dichotomis, flexuosis, moniJiformibus; auricula posterior dimidia 

 antica nonnihil longior; margo cardinalis dimidiam longitudinem 

 testae superans; pictura mire variabilis; {f, tW? ^tt» tt$ mm - 



— Species pro juniore praeced. male habita, tenuior, rotundatior. 

 Juniores in hoc genere adultis elongatiores. Boh. — Bergen. 



235. P. striatus Muell. = 0. fuci Gm., = 0. vitrea fi Gm., Chemn. 

 VII, f. 637 b, c, = P. aculeatus Jeffr., Sow., = P. rimulosus 

 Phil. — T. inaequivaJvis; auricula posterior antica dimidia vix 

 brevior; radii circ. 70 squamis muricati minutis fornicatis; 

 ^j mm. Kullen — Finm. 



236. P. vitreus (Pallium) Chemn. (Ostrea) Gm., (non Risso, non Sow.) 



— T. tenuissima, alba, orbicularis, tumidula, subaequilatera, po- 

 stice plenior, rimulis linearibus interruptis subtilissime radiatim 

 caelata, striis concentricis ornata capillaceis, crebre squamiferis, 

 squamis minutis, fornicatis, inferne resectis; marg. card. = £, 

 % long. t.; auriculae posticae angustae, obtusangulae, a disco le- 

 vius distinctae, = | 1. | anteriorum, quarum sinistra subrectan- 

 gula; sinus profundus acutus.: Var. laevigata, squamis ad latera 

 solum obviis; {{',£ mm ' ^ on « — Finm. 



***) Sinus distinctus, margine muticus. 



237. P. imbrifer n. — T. tenuissima, fragilis, alba, inaequivalvis, 

 v. sin. majore, aeque alta ac longa, subaequilatera , antice levius 

 producta, parum convexa, striis notata concentricis, imbricatis, 

 crebris, in v. d. simplicibus, in v. s. squamatis, sqilamis per 

 radios circ. 28 inaequales dispositis, vesicularibus, oblongis, spi- 

 nulis muricatis, versus marginem sensim auctis; margo cardin. 



