De marine Kridtaflejringer i Vest-Gronland og deres Fauna. 53 
concentric ribs, separated by rather wide interspaces. The ventral slope of the 
ribs steeper than the dorsal slope. In the middle part of the shell the ribs are crossed 
by radial furrows, so that the ribs appear to consist of rows of tubercles; in the 
spaces between the ribs these furrows are indistinct or quite absent. 
Skallen meget stor, kun lidet hvælvet, meget usymmetrisk; dens 
Højde større end længden. Overfladen dækket af talrige, kraftige, men 
forholdsvis smalle, koncentriske Ribber, adskilte ved temmelig brede 
Mellemrum. Ribbernes mod Ventralranden vendende Side stejlere end 
den mod Hvirvlen vendende. I Skallens Midtparti Radialfurer, krydsende 
Ribberne og opløsende disse i Knuderækker: disse Furer utydelige eller 
helt manglende 1 Ribbernes Mellemrum. 
Denne Art, som kun foreligger i Brudstykker, og hvis nøjagtige 
Form derfor er ukendt, synes at staa nærmest Jn. tuberculatus Woops 
fra Zonen med Actinocamax quadratus i England. Den adskiller sig fra 
denne Art ved de smallere og mere fjernt staaende Ribber og svagere 
Radialfurer. 
Patoot: 4 Ekspl. (3 fra »Patoot ac og 1 fra »Patoot ba). 
8. Inoceramus patootensis de Loriol. 
Tavle V, Fig. 1; Tavle VI, Fig. 1—2. 
1883. /noceramus patootensis DE Говтот, Fossile Saltvandsdyr fra Nord- 
Gronland. S. 211. 
?— — groenlandicus DE Говтог, лает. 5. 210. 
Shell very oblique, linguiform, rather greatly(?) convex. Height considerably 
greater than length. Hinge-margin forming about a right angle with the anterior 
margin. Posterior wing large, distinctly separated from the rest of the shell, with 
a rounded ridge close to the hinge-margin, but separated from it by a distinct 
furrow; posterior margin of the wing slightly concave above. Close to the wing 
the shell rises as a more or less distinct, radial ridge, anteriorly limited by a broad 
depression. Ornamentation consists of numerous strong, concentric ribs, which 
form slight curves from the anterior margin to about the (obliquely situated) middle 
axis of the shell; from here they bend upwards in a stronger curve and cross the 
depression of the shell nearly in a direct line or in a slightly concave curve; on the 
radial ridge they again bend strongly upwards. As a rule the ribs are of two sizes: 
at rather regular intervals one or more ribs occur, which’ are stouter than the others 
and produce more or less distinct tubercles on the radial ridge. Moreover, traces 
of slender radial ribs are frequently seen in the middle of the shell. The posterior 
wing with fine, concentric striæ. The ridge below the hinge-margin with tubercles 
which correspond with the stronger ribs of the rest of the shell and with the tubercles 
of the radial ridge. 
Skallen meget skæv, tungeformet, temmelig stærkt(?) hvælvet. 
Højden betydelig større end Længden. (Forreste Vinge ikke iagttaget). 
Hængselranden dannende omtrent en ret Vinkel med Skallens Forrand. 
Bageste Vinge stor, skarpt adskilt fra den øvrige Skal, med en nær 
Hængselranden liggende, men fra denne ved en tydelig Fure adskilt, 
afrundet Køl. Vingens Bagrand svagt konkav foroven. Den nærmest 
