OLAF HOLTEDAHL. [SEC. ARCT. EXP. FRAM 



larger shells is about 20, usually with 3, - - sometimes more - in the 

 -inns, and 4 --sometimes more --in the fold. 



I thought at first that this form was identical with 5. deckercnsis 

 WELL Kit 1 from the Decker Ferry of New Jersey and the Keyser of 

 .Maryland hut as I have had an opportunity of comparing it with speci- 

 mens from Maryland in Prof. SCHUCHEKT'S collection in the Peabody 

 Museum in New Haven, I have observed that there is some difference, 

 although very minute. The Arctic form is distinguished by a little more 

 acute, less globose beak, and by a distinctly deeper sinus and higher fold. 

 Furthermore the number of plications in the sinus is nearly always 3, 

 sometimes more; while in Stenochisma deckerensis the usual number is 

 2, very seldom 3. While we generally find these distinctions, I have seen 

 specimens from both localities so alike that it would have been impossible 

 to distinguish between them if they were found alone. The Ellesmereland 

 form may well be regarded as a northern representative of the other one. 



Occurrence: B, lower part, Reindeer Valley (a few, small speci- 

 mens). B, upper part, over the fragment limestone, Valley south of 

 Borgeu. 



Camarotoechia HALL and CLARKE. 



Canuirotoecltid I itchfieldensis SCHUCHERT var. angustata nov. var. 



PI. VIII, fig. 1. 



A single but complete specimen, showing a close relation to the 

 narrower specimens of Camarotoechia litchfieldensis SCHUCHERT from 

 the Keyser of Maryland, as for instance depicted in the "Lower Devonian" 

 of the Geological Survey of Maryland (pi. 63, figs. 11 14) yet it exhibits 

 a still narrower outline and furthermore a larger size than the small 

 form mentioned. The number of plications is about 15 in each valve, 

 *> in the sinus of the ventral. 4 in the fold of the dorsal valve. Greatot 

 length of the shell 12 mm., width 10 and thickness S cm. 



Occurrence: B, upper part, in the fragment-limestone, Valley 

 south of BorgiMi. 



UnchutlHH BAYLE. 



Unchmlux fV'ittrnh-ioiHilis nov. sp. 



PI. VIII. fig.:!. 



There are t\\< well-preserved .specimens at this form both showing 

 nearlv tin- -ame size: length 10 mm., width S, thickness in one 5, in the 



Se< "* \VMI.M!, (MM>|. Survey nf New Jersey, lieporl on Paleontology. Vol. 3, 

 \>.-2'\\. pi. -Jl, li.us. 1-1, r.H).'!. T. I' MAYNAIIH, ( ieol. Survey of Maryland. 

 Devonian, |.. :!1'.. j.l. <',:;, n^. 1-4, l'.)i:t. 



