SUPPLEMENT. 
383 
identical with the present form ; but the siphuncle is described as 
“ nearly marginal,*’ though this might have been due to crushing. 
Morris, in fact, remarks that his specimen was in such an imperfect 
state of preservation as to prevent the defining of any good specific 
character. 
Horizon. Carboniferous. 
Locality. Maitland, Xew South Wales. 
Represented in the Collection by three specimens, one of which 
(No. C. 2932) was presented by C. Purdon Clarke, Esq.; the others 
(No. C. 3395) were transferred from the Museum of Practical 
Geology. 
Genus HURONIA . 
Huronia Portlocki, Stokes. 
1840. Huronia Portlockii, Stokes, Trans. Geol. Soc. ser. ii. vol. v. 
pt. iii. p. 710, pi. lx. f. 5. 
1866. Orthoceras {^Huronia) Portlocki, Barraude, Syst. Sil. de la 
Boheme, vol. ii. ser. ii. pi. ccxxxii. f. 4 (after Stokes). 
1874. Orthoceras {Huronia) Portlocki, Barrande, ibid., texte, pt. iii. 
p. 741. 
1888. Actinoceras splieroidak (pars), Foord, Cat. of the Fossil Cephalo- 
poda in the British Museum (Nat. Hist.), pt. i. p. 186. 
Sp. Char. This species is represented by a fragment consisting of 
parts of eight chambers, with portions of seven segments of the 
siphuncle, weathered out of the hard limestone matrix. The speci- 
men is 7 inches long, 2| inches at its widest, and about 2 inches at 
its narrowest extremity. The rest of the shell is represented only by 
casts of the chambers, showing the position of the sutures and the 
boundaries of the shell-wall. The septa are 8 lines distant from 
each other, where the diameter of the specimen is 2| inches. A 
cross-section of one of the segments of the siphuncle is seen at the 
larger extremity of the specimen ; this shows that the segments are 
nearly circular in a horizontal direction, but they are compressed 
vertically, so that they have a cushion-like form. 
Remarks. This species most nearly resembles Huronia ohliqua, 
iStokes but it differs in the perfect horizontality of its siphuncular 
segments, and in the greater distance of the septa from each other. 
^ See Pt. I. of the present Catalogue, p. 199. 
^ Trans. Geol. Soc. 1824, ser. ii. vol. i. pt. ii., explanation of pi. xxviii. f. 4 ; 
and p. 203, Species iv. of Bigsby. 
