CI-ASS GASTROPODA 
113 
beskrifvit ett exemplar fran Spetsbcrgen, derom bar jag genom jemfor- 
else med originalex, ofvertygat mig. Dr. Morch ansag afven de fore- 
liggande ex. hora till Beck’s “PI. gigas”; en blick pa medfoljande 
afbildningar (f, 18 och 10) torde dock ofvertyga om, att de aro skiljak- 
tiga, niigot som for resten redan framgar ur en jemforelse af Morch’s 
och Verkriizen’s diagnoser Deremot ofverensstammer Verkr’s beskrifning 
afbildning af hans “PI. gigas” fran Vadso niistan fullstandigt med de 
foreliggande sa att jag med uteslutande af nagra ovasentliga karakterer, 
hvilka torde vara individuela variationer, kan aterge hans diagnos, sasom 
likaledes gallande for de ifragavarande ex.: Testa ovata, sub epidermide 
albida, longitudinaliter rugoso-striata et spiraliter striolata, olivaceo-livida; 
spira conica, anfra. 5 rotundati, supeme subplani, sutura vix impressa, 
apertura subampla intus violacea, columella superne curvata, violacea, basi 
oblique truncata, alba, cauda nulla; labrum tenue, actum. Den enda namn- 
varda skiljaktiget mellan Verkr’s och foreliggande ex. ar, att a de forra 
finnes pa midten af columella en hvitflackig callus-bildning, till hvilken 
endast otydliga spar synas hos ex. fran N. Sernlja. Helt sakert ar denna 
form nara beslagtad med Midd.’s “PI. simplex” ( Beitrdge, etc., 
11: pag.448), hvilken art jag dock kanner endast efter Midd.’s beskrifning 
och afbildning. Long., 14)4; lat., 7)4; anfr. ult., 10; alt. apert. 9y 2 F. 
(Leche.) 
By comparison with the original I have convinced myself that the 
present species is not PI. gigas Beck, PI. violacea Migh. et var gigantea 
Morch, one example of which, from Spitzbergen, Morch has described. 
Dr. Morch considers the present specimen as belonging to Beck’s PI. gigas; 
a glance at the accompanying illustrations (figs. 18 and 10) ought to 
convince one that they are different, something that also appears by a 
comparison of Morch’s and Verkruzen’s diagnosis. On the other hand, 
Verk’s description, illustration of his PI. gigas from Vadso, corresponds 
almost completely with the present specimen, so that, disregarding some 
insignificant characteristics which ought to be individual variations, I 
can reproduce quite his diagnosis, as being true, likewise applicable to 
the specimens in question: ( Testa acutum ). The only difference of note 
between Verk’s and the present specimen is, that upon the former there 
is found on the middle of the columella a white-spotted exuberance of 
which only faint traces appear on the specimen from Novaja Sernlja. In all 
probability this form is closely related to Midd’s PI. simplex (B-), 
which species I know, however, only by Midd’s description and illustra¬ 
tion. (Translation.) 
Type ? Type locality not known to writer. 
Range. Blizhni Islands to St. Lawrence Island, Bering Sea. 
[ H31 
