a12 Dr. R. v. Willemoes-Suhm on the 
and Labyrinthodonts of the Northumberland coal-field.”. Now 
the illustration here referred to is not a restoration of the palate 
of C. cristatus, Agassiz, but of that of C. tuberculatus, nobis. 
Secondly, he states that we describe the upper surface of the 
tooth of CO. eristatus as convex, whereas in reality we state 
that it is ‘somewhat hollowed or concave.” Our paper noticed 
by Mr. Miall was published in the ‘ Nat. Mist. Trans. of North- 
umberland and Durham,’ vol. iii. p. 61, the illustration referred 
to in vol. iv. pl. 14. 
EXPLANATION OF PLATE XIX. 
Fig. 1. Outside view of right mandible of Ctenodus obliquus, nat. size. 
Fig. 2. Right mandible, seen from above: a, articular piece; d, dental 
plate; s, symphysis of jaw. 
Fig. 3. Left pterygo-palatine bone, with dental plate attached, of Cteno- 
dus obliquus, nat. size: a, anterior end; pt, pterygoid border ; 
p, palatine border; s, symphysis; sp, rough surface for articula- 
tion with the sphenoid bone. 
Fig. 4. Vomerine tooth of Ctenodus, nat. size: a, front, b, side, c, back 
view. 
XX XIX.—Notes on some Young Stages of Umbellularia, and 
on its Geographical Distribution. By R. v. WILLEMOES- 
Suum, Ph.D., Naturalist to the ‘Challenger’ Expedition. 
[Plate XVIIL A.] 
Since Umbellularia was rediscovered by the Swedish Expe- 
dition to Greenland, the attention of zoologists has been 
specially drawn to it by a paper, with excellent plates, by 
T. Lindahl*, who himself brought it down from the Arctic 
regions. Another note has been published by Prof. Kéllikert 
on specimens of Umbellularia which were brought up during 
H.M.S. ‘Challenger’s’ cruise in the Atlantic, and sent to him 
for description by the hydrographer. Both authors were kind 
enough to send us their papers; and as in the mean time we 
got a good many more Umbellulariw, and even young stages 
of them, I think a few notes on the geographical distribution 
of the genus as far as it is now known to us will be welcome 
to zoologists, as also will a few figures of the earliest stages 
which we brought up in the Antarctic Ocean. 
* “Om Pennatulidslagtet Umbellula,” Kongl. Svenska Akademiens 
Handlingar, Bandet xiii. No. 3, Febr. 10, 1874. 
+ ‘Ueber den Bau und die systematische Stellung der Gattung Umbel- 
lularta,’ Wiirzburg, 2. Mai, 1874, 
