250 
marginale Parti hudagtige, uden tydeligt udprteget Sculptor. 
Kjolcn jevnt buet, uden Umbo. Tergalstykkenie forholdsvis 
smaa, med Aabningsranden kortere end Basalranden. Skjol- 
dene af ssedvanlig Form, med det apieale Hjorne spidst 
udtrukket. De ovre Sidestykker bredere end Skjoldene, 
mcsten rhombiske, med en lidet fremtrsedande subcentral 
1- mbo. De midterste Basalstykker storre end de ovrige, 
bredere end lange; de dorsale ved Basis uddragne i horn- 
formige Fortsatser; de ventrale kileformigt tillebende mod 
Midtlinien. Rostrum kort nedad frit fremspringende, hage- 
formigt krummet; foran samme en supplemental', utuld- 
stamdigt forkalket Plade. Stilken meget stor og tyk, lam- 
gere end Oapitulum, lige, kjodagtig, cylindrisk, kunforsynet 
med smaa og spredte Kalkkorn. Den ydre Beklmdnings- 
mombran ru at fine Smaapigge. Farven brungraa. Lteng- 
den indtil 30”"". 
Findesteder. Stat. 164, 200, 359. 
Bemserkninger. Den her omhandlede Form er saa 
ulig alle de foregaaende ved Stilkens betydeligo Udvikling 
kjpdagtige Beskaflenhed samt ved Rostrums eiendom- 
melige Form, at den allerede ved forste 0iekast kjendes 
fra samme og muligvis fortjente at opstilles som Typcn for 
en egen Slaegt. I selve Dyrets Bygning synes imidlertid 
ingen vmsentlig Forskjel at v;ere tilstede. 
Beskrivelse. Legemet er (se PL XX, Fig. 11, 12) 
temmelig langstrakt, hvilket vmsentlig skyldes Stilkens be- 
tydelige Storrelse. Paa Spiritusexemplarer contralieres denne 
imidlertid paa G-rund at sin ringe fvai kholdighed temmelig 
stierkt baade i Lsengde- og Brededimensioner, hvilket har 
til Folge, at liele Legemets Form noget mndres. Hvad 
Stillingen angaar i Forhold til de Gjenstaride, hvortil Le- 
gemet er finestet, saa er den en lignende som hos Sc. an- 
gusturn og stnolatum, idet ingen mairkbar Boining af Stil- 
ken forefindes. 
Capitulum er seet fra Siden (Fig. 11) forholdsvis 
smalt og af noget uregelmaassig oval Form, bredest ved 
Basis og noget afsmalnende' mod Enden. Den ventrale Rand 
er paa Midten noget indbugtet og Apex temmelig kort samt 
beliggende nedenfor Skallens Axe. Yalvleme mangier nogen 
tydeligt udprseget Sculptur og er mindre staerkt forkalkede 
end hos de ovrige Arter, idet det marginale Parti er mere 
eller mindre lnidagtigt. Suturerne inellem dcm er dog over- 
alt tydeligt markerede. 
Kjolen er som hos de 3 foregaaende Arter ganske 
smal og jevnt buet, uden nogen tydelig Umbo. 
Tergalstykkenie er forholdsvis smaa, men af den smd- 
vanlige skjasvt triangulaire Form og har Aabningsranden 
betydelig kortere end Basalranden. 
Skjoldene er ikke meget mindre og som sasdvanlig 
ui egelmsessigt firkantede, med Lateralranden lmngere end 
baade Tergal- og Basalranden; deres apieale Hjorne er 
ogsaa her uddraget i en skarp Spids, der kegger sig ud 
over Siderne af Tergalstykkerne. 
marginal part cutaneous, without clearly prominent sculptur- 
ing- Keel evenly arched, no umbo. Tergal segments com- 
paratively small, with occluding margin shorter than basal. 
Shields of usual form, with apical corner acutely produced. 
Upper lateral segments broader than shields, well-nigh 
rhomboidal, with a small, salient, subcentral umbo. Median 
basal segments larger than rest, broader than long; dorsal 
produced at base to corniform probations; ventral extending 
wedge-shaped toward medial line. Rostrum short, jutting 
out freely below, hamate; anterior to rostrum a supple- 
mentary, in part calcareous, plate. Peduncle very large 
and thick, longer than capitulum, straight, carneous, cy- 
lindric , furnished merely with small and scattered cal- 
careous granules. The outer investing membrane rough, 
ti om minute spikelets. Colour a brownish-grey. Length 
reaching 30 m “. 
Locality. — Stats. 164, 200, 359. 
Remarks. — The species treated of here differs so 
materially Irom all the preceding, by reason of the con- 
siderable development and carneous character of the peduncle, 
along with the peculiar form of the rostrum, as to admit, 
at the first glance, of being distinguished from them, and 
possibly to warrant its establishment as the type of a separate 
genus. Meanwhile, in the structure of the animal no es- 
sential deviation would appear to exist. 
Description. — The body (see PI. XX, figs. 11, 12) 
is rat har elongate, a character principally arising from the 
considerable size of the peduncle. Tn spirit-specimens, how- 
over, the latter, from its limited deposit of lime, becomes a 
good deal contracted, both as to length and breadth, the 
result of which is a slight change in the form of body. 
As regards the position to objects whereto the body is 
|J attached, this is precisely the same as in Sc. angustwn 
and A', striolatum, since no appreciable inflexion of the 
peduncle can be detected. 
The capitulum, viewed from the side (fig. 11), is 
nari ow, and of a somewhat irregular-oval form, broadest 
at the base, and slightly tapering toward the extremity. 
I he ventral margin, in the middle, is somewhat indexed, 
and the apex rather short, as also placed below the axis 
of the shell. The valves do not exhibit any strictly prom- 
inent sculpturing, and are less calcined that in the other 
species, their marginal part being more or less cutaneous. 
The sutures between are meanwhile everywhere distinctly 
marked. 
Lhe keel, as in the 3 preceding species, is quite slender 
and evenly arched, without any distinct umbo. 
The tergal segments are comparatively small, but of 
the usual oblique-triangular form, and have the occluding 
margin considerably shorter than the basal. 
The shields are not much smaller, and, as usual, ir- 
regular-quadratic, with the lateral margin longer than both 
teigal and basal; here, too, the apical corner is produced 
to a sharp point, that extends over the sides of the tergal 
segments. 
