Yes, that's the one. They do transcribe it as 8. Thank you for confirming this. On the digitalised image of the record there is a squiggle.
Calculating the time between the birth of the orher children (Catherine (11/07/1875), Margaret (04/1877), Eliza Ann (15/04/1879), William James (07/10/1881), George (22/10/1883), Ellen (01/09/1886), Thomas (04/01/1890)), I think the other child must have been born either between George & Ellen / Ellen & Thomas / after Thomas.