. Brachiopod genera of the suborders Orthoidea and Pentameroidea. Orthoidea; Pentameroidea; Paleontology -- Paleozoic. 160 GENERA OF THE SUBORDERS ORTHOIDEA AND PENTAMEROIDEA Costellate section etas'Wilcott 1924 Wilcott 192+ H. lesleyi Wilcoti 1908 ? 1924 ? H. vermontana Walcott 1912 f ^i\co\X 1924 ? Hebertella battis (Billings) 1865 Distinguishing characters.—Huenella is recog- nized most readily by its syntrophinoid outline and profile, costate or costellate exterior, pseudospon- dylium, convergent brachiophore supports, and dorsal Fig. 24.—a-c,
. Brachiopod genera of the suborders Orthoidea and Pentameroidea. Orthoidea; Pentameroidea; Paleontology -- Paleozoic. 160 GENERA OF THE SUBORDERS ORTHOIDEA AND PENTAMEROIDEA Costellate section etas'Wilcott 1924 Wilcott 192+ H. lesleyi Wilcoti 1908 ? 1924 ? H. vermontana Walcott 1912 f ^i\co\X 1924 ? Hebertella battis (Billings) 1865 Distinguishing characters.—Huenella is recog- nized most readily by its syntrophinoid outline and profile, costate or costellate exterior, pseudospon- dylium, convergent brachiophore supports, and dorsal Fig. 24.—a-c, Huenella abnormis (Walcott). a, ventral internal mold, showing muscular impressions on the imprint of the spondylium. b, c, dorsal internal mold and interior, showing musculature and brachiophore plates {brf). ov, ovarian impressions (mistaken by Walcott for muscle marks); di, diductor impressions; ad, adductor impres- sions; Ps, pallial sinus. d, e, H. texana (Walcott), ventral and dorsal exteriors, showing coarse ribbing and strong fold and sulcus. After Walcott 1912, pi. 103. Discussion.—Huenella differs from Syntropkia and Syntrofkina not only in the external costation but also in internal characters. Internally there is a pseudo- spondylium bearing the muscle impressions; at the front it is elevated slightly on a prominent thickening of secondary shell. From the musculature of H. ab- normis the myology of this genus would appear to be essentially the same as that of Syntrofhina. However, the diductor and adductor scars are not flabellate im- pressions outside the pallial trunks as Walcott describes and figures in that species (1912, p. 806, pi. 103, fig. 2b). As he figures these impressions, the adductor scars are posterior to the diductors; their position and arrangement are accordingly unlike the ventral mus- culature of any other known brachiopod. Walcott has evidently mistaken impressions that are in the position of, and are usually considered to be, ovarian impr
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