BRACHIOPODA. 
lateral... Tongue narrow, with three pectinated plates in each 
row. Jaws large and strong, margins without denticulations. 
This genus is closely related to Antiopa. 
FHYLLOBRANCHUS, Alder and Hancock, 1863. 
Type, Proctonotus orientalis, Kelaart. India. 
Animal elongated, flattened on the back, angulated at the 
sides, without a distinct cloak. Tentacles two, dorsal, longitudi- 
nally folded, bifurcate above, non-retractile. Head produced 
at the sides into angulated and folded expansions. Branchize 
leaf-like, with distinct foot-stalks, arranged in several rows 
along the sides of the back and round the head in front. - Anus 
lateral. The tongue resembles that of Hermea. 
f —— 
CLASS IV.—BRACHIOPODA.* 
Faminty J.—TEREBRATULIDA.+ 
TEREBRATULA (see p. 363). 
Sub-genus, Rensseleeria, Hall, 1859. 
Dedicated to the late Hon. Stephen Van Rensselaer. 
Examples, R. ovoides, Hall, Fig. 18; Terebratula strigiceps, 
Romer. 
Sheli ovoid or suborbicular, without mesial fold or sinus; 
beak ,prominent, acute, more or less 
incurved; foramen terminal, some- 
times concealed. Ventral valve with, 
two diverging cardinal teeth supported. 
by strong dental plates. Dorsal valve 
with the dental sockets between the 
shell and a strong process from which 
the slender crura proceed, first in a 
direct line, and then one division of 
each, diverging into the centre of the 
ventralvalve, terminate in acute points. 
On the other side the divisions extend 
nearly at right angles to the axis of 
the shell into the cayity of the dorsal 
valve; and thence bending abruptly > 
forward and gradually converging, The fete of ihe dorsal valve 
terminate above the centre of the shell of R. ovoides, showing the thick- 
in a thin flattened or longitudinally 6PCd, Prpccsses at the beak, tha 
crura, the loop, and the narrow 
concaye plate. longitudinal plate. 
* See p. 354. 7 See p. 363, 
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