Which trilobite is next to Ellipsocephalus?

[Cicija]

I bought a matrix with more Ellipsocephalus hoffi at the auction. Origin: Jince, Czech Republic.

I haven't received the plate yet, but in the photos I noticed something that looks like the cephalon of a trilobite larger than Ellipsocephalus (red arrow in the photos).
The dimensions of the matrix are 27 x 12 x 4 cm.

 

Does anyone know what this is about?
I probably won't bother you with similar questions this year, the piggy bank is empty. :-)
 

[Cicija]

To answer myself.  

 

E. hoffi  occurs in the Middle Cambrian of the Czech Republic, Jince Formation, Ellipsocephalus hoffi–Paradoxides (Rejkocephalus)–Lingulella Biozone of Fatka & Szabad (2014).

Therefore, I assume that it is Paradoxides sp., perhaps P. gracilis.

https://en.wikipedia.org/wiki/Paradoxides#/media/File:Paradoxides_gracilis.JPG

 

I ask experts to correct me if I am wrong.

 

[Kane]

I would be fairly confident to label it Paradoxides gracilis.

[FossilDAWG]

Nice plate of trilobites!

 

Don

[piranha]

Hydrocephalus is another large paradoxidid associated with Ellipsocephalus in the Jince Fm.

 

Laibl, L., Fatka, O., Budil, P., Ahlberg, P., Szabad, M., Vokáč, V., Kozák, V. 2015
The Ontogeny of Ellipsocephalus (Trilobita) and Systematic Position of Ellipsocephalidae.
Alcheringa: An Australasian Journal of Palaeontology, 39(4):477-487  PDF LINK