ON THE ANASPIDACEA, LIVING AND FOSSIL. 499 
and apparently some of the thoracic limbs were biramous. 
The first thoracic limb was, however, raptorial and greatly 
enlarged. ‘There is less doubt about Paleocaris (text-figs. 
56, 57), as the thoracic limbs are distinctly biramous, there 
TEXT-FIG. 3. 
Preanaspides precursor,after Henry Woodward. a. Lateral 
view. B. Dorsal view. c. Telson and uropods. D. Fourth 
thoracic limb. E. Seventh thoracic limb, 
are eight free thoracic segments, and the antenne and tail- 
fan are very similar to those structures in Anaspides. ‘The 
eyes are unfortunately unknown. 
Gasocaris (text-fig.59), despite Professor Fritsch’s asser- 
tion that the limbs are uniramous, was certainly a typical 
member of the Anaspidacea in all other respects. 
