BRACHIOPODA. 
109 
3. Morrisia? eusticta. 
Shell small, orbicular, depressed, smooth, with a few obscure 
lines of growth, densely punctate and ornamented with radiating 
rows of minute points ; dorsal valve convex, with an obtuse lon- 
gitudinal ridge ; beak not prominent ; foramen large, ineomplete ; 
deltidium rudimentai-y. Lon. 5i, lat. 5 lines. 
Terebratula eusticta, Phili2)pi, 1836, Moll. Sicil. i. p. 98. t. 6. f. 9. 
Orthis eusticta, Phil. 1844, Moll. Sicil. ii. p. 70. 
Fossil. Pliocene. Palermo. 
10. KRAUSSIA, 
Shell subcircular, vsith a nearly straight hinge-line ; beak 
truncated; foramen large and round; deltidia small, disunited; 
beak laterally keeled ; hinge-area flat ; dorsal valve longitudinally 
depressed; internal skeleton consisting of a small forked pro- 
cess arising from the septum, near the centre of the valve (fig. 19). 
Kraussia (rubra), Davidson, 1852, Ann. Nat. Hist. p. 369. 
Terebratulse annuliferse (part.), Quenst. Handb. p. 463. 
Fig. 19. Kraussia rubra. Fig. 20. K. Lamarclciana. 
Ffg. 19 . — Interior of dorsal valve, showing the forked apophysis in the centre, 
and the branching pallial vessels on each side. 
Fig. 20. — Interior of dorsal valve with the animal, from a dry specimen in the 
British Museum. 
The brachial apparatus of Kraussia Lamarckiana (fig. 20) is 
like that of Terebratula and Terebratella, but the arms are un- 
usually small in the species examined, and their fringes do not 
extend more than half way towards the border of the shell; 
they are supported solely by the small forked process above 
described, no other part of the apophysary system being calcified. 
1. Kraussia rubra. B.M. 
Shell suborbicular, ornamented with numerous, radiating ribs, 
sometimes bifurcating, or augmenting by intercalation ; colom- 
pale, with red rays and bands of growth ; dorsal valve (see fig. 19) 
shghtly depressed in the centre, in front, furnished internally with 
