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



mellar thread for two whirls only. Operculum normal, with 

 thin edge, dark red. 



32. Lacuna porrecta. 



L. testa L. puteolo simili, sed multo majore, spira magis exserta; 

 seu omnino 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 itnpressis, vertice 

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

 intus subrecto ; lacuna maxima, elongata, ad basin arcup.ta ; 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 irnpressis ; aperturam 

 versus magis expansa. Long. *65, long. spir. '25, lat. *5, div. 60. 

 ?Var. excequata : testa L. effusa 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 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 t var.) compacta. 



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

 subturrita, marginibus spirae 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, irregulari ; adolescente 

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

 regulariter strigata, strigis fusco-aurantiacis, ssepe ziczacformibus ; 

 anfr. vi., quorum primi compacti, apice submamillato ; deki 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. '6, 

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

 Hab. Neeah Bay (Swan). 

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



normal growth, with very slight cbink. 



240 



