CYETOCEEATID^. 
287 
below the aperture. The distance between the septa is equal 
to about -jig- the ventro-dorsal diameter. The siphuncle is placed 
at a little distance from the convex border ; it is slightly inflated 
between the septa. The outer surface of the test shows a series 
of irregularly spaced and indistinct lines of growth crossed by 
extremely fine longitudinal lines. Beneath this outer layer is an 
inner one, the surface of which is ornamented with a series of close- 
set transverse lamellae, with a direct imbrication. 
BemarJcs. This species is distinguished from all others of the 
same group by its short and inflated form, as well as by the 
ornaments of its test. 31. validum, Barr. sp. (pi. cxiv. flP. 13-21), is 
its nearest ally, but that species increases less rapidly and its surface 
ornaments are different. 
Horizon. Etage E, bande e 2 (= Salopian). 
Locality. Lochkow, Butowitz (bande el), Bohemia. 
Eepresented in the Collection by two examples. 
Cyrtoceras (Meloceras) sericarius^ Barraude, sp. 
1877. Cyrtoceras sericarius, Barrande, Syst. Sil. de la Boheme, vol. ii. 
Suppl. et Ser. tardive, p. 182, pi. dxxviii. ff. 6-10. 
Sp. Char. The shell is very slightly curved. Upon a chord of 
35 millim., subtending the concave side of the shell, the highest 
perpendicular is only 3 millim. The transverse section is nearly 
circular. The rate of increase in a length of 25 millim., measured 
in the septate part of the shell, is in the ratio of 2 to 5. The body- 
chamber occupies nearly half the entire length of the shell. The out- 
line of the aperture is parallel to the plane of the last septum. The 
distance between the septa near the body-chamber is equal to about 
^ the diameter of the shell. The siphuncle is close to the convex 
border, without touching the test ; its elements are cylindrical. 
The ornaments of tbe test consist of a series of transverse, fine, and 
regular raised lines, separated by spaces equal to about half their 
diameter ; about five of the lines may be counted in the space of 
1 line. 
RemarTcs. The specimen figured by Barrande under the name of 
Orthoceras infundibulum (pi. cxci. f. 1) appears to me to be identical 
with the present species, and that author admits this to be probable, 
though he places it with other types. 
Horizon. Etage E, bande e 2 (= Salopian). 
Locality. Karlstein, Bohemia. 
Eepresented in the Collection by a single example. 
