gular, attached to the body as far as the base of the ' 
directly over rs anterior part of caudal. Ventral fin distan 
anal. Rays of the fins very fine and numerous ; onda obl 
the surface of each excavate. 
osthenes australis—Body narrow oblong. Scales smooth and 
without markings, subquadrate, over the enn part of the body 
transverse. Caudal fin slightly furcate. Anal fin larger than dorsal ; 
two to four free spines or accessory rays just in A ait of each of the 
fins ; articulations of rays oblong rectangular, those of dorsal fin, near 
its base and outer margin, | or four times as long as broad, and sur- 
face fluted-excavated.—From the B coal- -pit, Newcastle, on the Hun- 
ter, where it was obtained by Mr. James Steel, the Superintendent of 
the works, by whom the en was kindly submitted to the writer 
for description. The specimen is in the Museum of the Newcastle 
Mechanics’ Institute. The anterior part, to Sesond the perinia fins, is 
wanting. Length of +t beepers 12 inches: width 22 in 
base of caudal fin 1 in 
HELICERUS, (nov. gen J—Allied to Belemnites. 
cle thick, subcylindrical, 5 eine internally a slender 
have contained : a rolled. won meiere to s siaioced with t 
i : b 
Helicerus fuegiensis.—Ossicle cylindrical, $ an inch in 
diameter of tube within, nearly 3 that of the fossil; and 
chamber more than 3 the same. Texture of the oss Ossi 
a like ordinary Belemnites. Found ay the writer in i 
n the shores of Nassau Bay, near Cape Horn. 
Nore.—In the valuable. article by F. M’Coy on the fos 
tralia, which was published some months after the writer’s 
this subject, but before that article had reached Mr. M’Coy, the 
some species redescribed. We observe that 
Cardinia? exilis, MC 
maria Mo 
Coy, is Cardinia recta, Ds 
Pleurotomaria 1a, M’Coy, is Pleurotomaria trifilata, D. 
Pachydomus ovalis and P. pusillus, M’Co oy, are peste’ ‘of Astartila, 
D., a genus nearer Astarte, than yg aes 
a Eurydesma E. cordata ' ? of 
The genus Notomya, M’Coy, corresponds to Pyramus, D., and from 
a ‘a our species, we can not believe that they are related 
) genus | Maonia of the author, (changed from Myonia,) along 
ramus, and probably Cleobis, make a natural group among 
idee, having the smaller anterior erdeaotar impression facing in the 
ies with the she r anterior, | and thus differing strikingly from 
Pachydomus, Astartila, Cardinia. Moreover the largetat i 
is ’ prolonged “ipa, and is pointed, towards the smaller anterio 
lar impression. Maonia has a second small anterior ea | 
situated | vet 
up on the "beaks if this is not sufficient a 
> it a the species may be thrown togethe in the es 
