428 Dr. P. P. Carpenter on new Forms of Mollusca. 



mellar thread for two whirls only. Operculum normal, with 

 thin edge, dark red. 



33. Lacuna j)orrecta. 



L. testa L. 2^uieolo simili, sed multo majore, spira magis exserta ; 

 seu omnino fusca, seu zona pallidiore, sen pallida lineolis fusces- 

 centibus tcnuissime spiraliter ornata ; epidermide temxiter striata 

 olivacea sou viridescente induta; tenuiore, spiraliter tenuiter striata; 

 anfr. v., vix planatis, rapide augentibus, suturis impressis, vertice 

 mamillato ; apertura tumente ; labio tenui, vix parietem attingente, 

 iutus subrecto ; lacuna maxima, elougata, ad basin arcuata ; peri- 

 pheria expansa. Long. -52, long. sj)ir. -2, lat, -4, div. 80°. 

 ?yar. e^usa : testa L.jiorrec fee simili, sed multo majore ; spira elcvata, 

 satis eifusa ; anfr. tumidioribus, suturis valde impressis ; aperturam 

 versus magis expansa. Long. '65, long. spir. "2!), lat. '5, div. 60°. 

 ?Var. exaquata : testa L. effusa simili, sed anfr. planatis, suturis 

 parum impressis. Long. '5, long. spir. '2, lat. •42, div. 80°. 

 Hah. Neeah Bay {Sivan). 



The form L. excequata is intermediate between the very dif- 

 ferent L. porreda and L. cffusa. The Lacuna vary so much 

 {vide Forbes & Hanley in loco) that^ even with a large multitude 

 of specimens, it is not easy to state what constitutes a species. 



33. Lacuna (? solidula, var.) compacta. 



L. testa L. soliduhe, var., simili ; parva, solida, compacta, angusta, 

 subturrita, marginibus spirse excurvatis : aurantiaca, interdum pal- 

 lidiore zonata ; anfr. subplanatis, suturis distinctis ; tota superficie 

 confertissime spiraliter striolata ; basi valde angulata, subplanata ; 

 apertura subquadrata ; columella vix lacunata. Long. '23, long, 

 spir. -1, lat. '17, div. 60°. 



Variat testa elongata : variat quoque columella normaliter lacunata. 

 Hab. Neeah Bay {Swan). 

 Possibly an extreme form of the very variable L. solidula, Lov. 



{— L. carinata, Gld., non A. Ad., = Modelia striata, Gabb), yet 



distinct in all ages. The young shells resemble small Litorince, 



34. Lacuna variegata. 



L. testa tenui, plus minusve elevata, soluta, irregular! ; adolescente 

 fusco-purpureo ; adulta livida, radiatim seu diagonaliter varie ir- 

 regulariter strigata, strigis fusco-aurantiacis, ssepe ziczacformibus ; 

 anfr. vi., quorum primi compacti, apice submamillato ; dein solutis, 

 postice planatis, antice expansis ; basi rotundata seu angulata ; 

 apertura subovata ; labro postice porrecto ; labio ssepe parietem vix 

 attingente ; columella intus recta, extus valde lacunata. Long. '3, 

 long. spir. -16, lat. -17, div. 50°. 

 Hab. Neeah Bay {Swan). 

 Painted like L. decorata, A. Ad., which differs in having a 



normal growth, with very slight chink. 



