take a look at these citations; they couldn't figure out which one they liked in the 1880s either!

thermiomorphic Having the form of a beast; also transf. of or pertaining to a deity worshipped in the form of a beast.
1882 Sat. Rev. 21 Jan. 71 The process by which Theriomorphic became Anthropomorphic Gods is+sufficiently illustrated in early religions. 1884 E. H. Plumptre in Expositor July 4 The ‘abominations’ of the Egyptian theriomorphic worship.

zoomorphic Attributing the form or nature of an animal to something, esp. to a deity or superhuman being. (Cf. anthropomorphic.)
1880 Murray Philol. Soc. Addr. 22 The enlargement or abbreviation of words by letters, which in the curious zoomorphic dialect of many books, creep in, or drop out, or fall away, or develop as parasites. 1884 A. Lang Custom & Myth 118 Mr. Sayce, who recognises totemism as the origin of the zoomorphic element in Egyptian religion.