6 Dr. P. P. Carpenter on new Forms of Mnlhsca 



mellar thread for two whirls only. Operculum normal^ with 

 thin edge, dark red. 



32. Lacuna porrecta. 



L. itsXa. L. puteolo simili, sed multo majors, spira magis exserta; 

 seu omniiio fusca, seu zona pallidiore, seu pallida lineolis fusces- 

 centibus tenuissime spiraliter ornata ; epidermide tenuiter striata 

 olivacea seu viridescente induta; tenuiore, spiraliter tenuiter striata ; 

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

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

 intus subrecto ; lacuna maxima, elongata, ad basin arcuata ; peri- 

 pheria expansa. Long. "52, long. spir. '2, lat. '4, div. 80°. 



?Var. effusa : testa L.porrectce simili, sed multo majore ; spira elevata, 

 satis effusa ; anfr. tumidioribus, suturis valde impressis ; aperturara 

 versus magis expansa. Long. "65, long. spir. •25, lat. "5, div. 60°. 



?Var. excequata : testa L. effusce simili, sed anfr. planatis, suturis 

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



Hab. Neeah Bay (-Swan). 



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

 ferent, L. porrecta and L. effusa. The Lacuna vary so much 

 {vide Porbes & Hanley in loco) that, even with a large multitude 

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



33. Lacuna (J solidula, var.)~ compacta. 



L. testa Z. solidulee, var., simili; parva, solida, compacta, angusta, 

 subturrita, mavginibus spiree excurvatis : aurantiaca, interdum pal- 

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

 confertissirae spirahter striolata ; basi valde angulata, subplanata ; 

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

 spir. -I, lat. -17, div. 60°. 



Variat testa elongata : variat quoque columella normaliter lacunata. 

 Hab. Neeah Bay [Swari). 

 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 Litorinm. 



34. Lacuna variegata, 

 L. testa tenui, plus minusve elevata, soluta, irregulari ; adolescente 

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

 regulariter strigata, strigis fusco-aurantiacis, seepe ziczacformibus ; 

 anfr. vi., quorum primi corapacti, 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. -J, 

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

 Hab. Neeah Bay {Swan). 



Painted like L. decorata, A. Ad., which differs in havin"- a 

 normal growth, with very slight cliink. 



240 



