G E N A. 



Genus GEN A, Gray. 



Testa auriformis, dcpreasa, ohliqua, Icengata aiit striata ; 



spira j)arra, vix exscrta ; aperlura maxima, ovata. 



intiis iiacr a. Operculum nullum. 

 Shell aurifonii, depressed, oblique, smooth or striated ; 



spire small, scarcely exserted ; apertui'e very 



large, ovate, pearly within. Operculum none. 



Generally tlie Gknjj may be di.stingiiislied from the 

 other two Genera of StnmateUinci: by their flattened 

 form and smootli surface, although some of tlio smaller 

 species have a somewhat more orbicular form. The 

 animals live among stones or on coral reefs between 

 tides. A large proportion of the species are the results 

 of the late Mr. Cuming's researches in tlie Philippines. 

 Australia and some of the Pacilic Islands contribute a 

 few. 



Species 1. (Mus. Brit.) 



Gek.\ i.iNTiiicuLA. Gen. testa parvd, elongate, plniiu- 

 latd, spiralilcr siriald, pallidissime fulfil, ruhro 

 variegatd ; spird minutd ; ultimo anfractu .^uprd 

 medium depresso, attenuato. 



The little-bo.'^t Gena. Siiell small, elongated, 

 flattened, .si)irally striated, very pale fulvous. 



variegated with 



minute ; last whorl 



depressed above the middle, attenuated. 

 A. Ad.\.ms. Proc. Zool. Hoc, 1850. 

 Hab. Isl. Mindoro, Philippines. 



Mc 



agated and narrow than any other species. 



The YiaLOW Ge,\.\. Shell yellowish, variegated with 

 red or brown, smooth, obliquely oblong, posteriorly 

 scarcely depressed ; spire small, almost flat. 



LiNN^L's (Patella). Systema Nature. 



Stomatella avricula. La 

 Hah. Eastern Seas. 



Species 2. (Fig. a, b, Mus. Brit.) 



Gena li^'tea. Gen. testa luted, ruhro vel fiisco varie- 

 gatd, laevigatd, oblique ublongd, poslicc vix depressa ; 

 spird minutd, fere planulatd. 



Aprif 



±. 



Spe 



?,. (Fig. a, b, Mus. Nobis.) 



Gena planitlata. Gen. testa oblongd, conve.co-planu- 

 latd, tenuiter striata, virescenti, sti-ii/is subriridis vel 

 fasciis articulalisfuscis nilmlisque varinjatd ; spird 

 minima, lateraliter decumlunti ; tuhio columellari 

 alho, lain, versus suturam sudcalloso. 



The ei.attenei) Gena. Shell oblong, convex-flattened, 

 finely striated, greenish, variegated with greenish 

 stripes or brown articulated bands and clouds : 

 spire very small, laterally decumbent ; columellar 

 lip white, broad, rather callous toward the suture. 



Lamarck (Stomatella). Hist. Nat. Anim. s. Vert. 



J fab. Isl. Caminguing, Philippines. 



Species 4. (Fig. a, h, Mus. Brit.) 



Gexa stiuatula. Gen. testd haliotoided, spirediter 

 striatd, oblique oblougd, subinflatd, flammulis slri- 

 gisque rubris vel subriridis varieyatd; spird exsertd ; 

 ultimo anfractu dorso prope suturam depresso, stib- 

 excavato, titm subgibboso, deinde subdepresso, ad 

 medium obliqve inflato ; aperturd elongatd, labia 

 externa fltxuo so supra medium. 



The stimated Gena. Shell haliotis-shaped, spirally 

 striated, obliquely oblong, rather inflated, varie- 

 gated with red or greenish stripes and flames; 

 spire e.xserted ; last whorl depressed at the back, 

 sbghtly excavated near the suture, then somewhat 

 gibbous, theuce depressed, obliquely inflated at 



1S74. 



