APPENDIX 



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Superfamily RHYNCHONELLACEA Schuchert 1896 



Genus RHYNCHOCAMARA Schuchert and 

 Cooper 1931 



(Gr. rhynchos, beak; knmnra, chamber) 



PI. 25, figs. 1,2, 7, 17, 18 



Schuchert and Cooper, Anier. Jour. Sci. (5), vol. 22, 1931, 

 p. 248. 



Genoholotype. — R. flicata Schuchert and Cooper 

 1931. 



(D 



Cb 



internal structure of Rhynchocamara is essentially 

 rhynchonelloid, not pentameroid, since the notothyrial 

 or subrostral chamber has much the same shape as that 

 seen in later rhynchonellids. 



Geologic range. — Ordovician (Chazy), so far as 

 known. 



American Species 



Camerella bella Fenton 1928 



C. variam Billings 1859 



Rhynchocamara flicata Schuchert .ind Cooper 1931 



CD 



5 



e 



Fig. 36. — Liocoelia froxima (Barrande). The beak and spondylium of Liocoelia are rather strongly curved, which 

 accounts for the peculiar oval seen in section 1. Sections 4 and 5 show the rhynchonelloid chamber in the dorsal valve. 

 Distance of each section from the beak: 



1 — 1.4 mm. 

 2—2.6 

 3—3.3 

 4 — 3.5 



.5 mm. 

 6-5.2 

 7—6.2 



In a shell 18.6 mm. in length the dorsal septum persisted for 8.5 mm. and the ventral septum was present 9 mr 

 anterior to the beak. 



The chief distinguishing features of Rhynchocamara 

 are the camereUoid exterior, short hinge-line, ventral 

 spondylium duplex, and rhynchonelloid cruralium. 

 From Camerella it differs in outline, the former being 

 more globular, and in the structure of the dorsal valve. 

 The cruralium duplex of Camerella is long and nar- 

 row, extending for perhaps one-fourth the length of 

 the valve, whereas in Rhynchocamara it is confined 

 to a small region beneath the beak. The dorsal 



Genus LIOCCELIA Schuchert and Cooper 1931 



(Gr. leios, smooth; koilia, belly) 



PI. 25, figs. 31,32, 37; pi. 29, fig. 9; t. fig. 36 



Schuchert and Cooper, Amer. Jour. Sci. (5), vol. 22, 1931, 

 p. 248. 



Genohoi.OTVPE. — Pentamerus froxima Barrande, 

 see Syst. Sil. BohSme, 1879, vol. 5, pi. 9, fig. 5, pi. 81, 

 fig. 5. 



