280 Faunula Littorinidae Islandiae Borealis. 
Habit.: portus Isafjérdur 1913, passim. (spec. typ. coll. 
Schlesch, Mus. Hull, Anglia). 
Monst. coarctata Sars. 
Testa obtuse conica, spira valde producta dimidiam fere 
testae longitudinem occupante, apice obtusa, anfr. elongatis 
et medio coarctatis, apertura obpyriformi, labro externo supine 
appresso. Long. 16 mm. (Sars). 
Habit. tota, sed ubique rarior. 
Littorina obtusata Linné. 
Testa solida, colore valde variabili, nunc uniformiter 
lutea vel fuscata, nunc modo fasciata vel maculata, forma 
oblique ovata, spira brevissima et obtusa, vix elevata, anfr. 
5-6 convexis, ultimo maximo, oblique expanso, sutura parum 
impressa, apertura plus minusve patula oblique, labro externo 
leviter incrassato, interno callum magnum et solidum formante. 
Superficies sublaevis, striis spiralibus parum conspicuis. Long. 
I3 mm. (Sars.). 
Habit.: raro. 
Littorina rudis Maton. 
Testa solidula, colore saepius uniformiter obscure fuscato, 
rarius rubra vel albida, interdum fasciata vel maculata, forma 
ovato-turrita, spira producta, anfr. 5, angulato-convexis, 
medio saepius leviter planulatis, sutura profunde impressa, 
apert. oblique rotundata, labro externo tenui, columella brevi, 
planulata. Superficies costellis spiralibus plus minusve elevatis 
rudis. Long. 10 mm. (Sars.). 
Habit. : passim. 
Var. groenlandica Menke. 
Testa duplo major, spira magis producta, anfr. 6, aequali- 
ter convexis, apert. sat expansa, columella lata. Long. 20 mm. 
(Sars.). 
Habit. : passim. 
Var. conoidea Schlesch, nov. var. 
Testa subsolida, forma elongato-pyramidali, spira valde 
producta, attenuata, apice acuto, subcostulata, anfr 5, apertura 
subglobosa, labro externo sat arcuato, tenui, Long. 16. lat. 
12, ap. long. 6 mm. 
Habit: portus Isafjérdur, 1913, raro, (spec. typ. coll. 
Schlesch, Mus. Hull, Anglia). 
(The specimens referred to in this paper are in the Schlesch 
Collection in the Hull Museum). 

N ‘Naturalist, 
