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BULLETIN 201, UNITED STATES NATIONAL MUSEUM 



age could be demonstrated. Table 6 shows that this species conforms 

 with the general rule established for other species : that the rostrum 

 and the posterolateral spines of the carapace become relatively shorter 

 with growth. These specimens agree with Ortmann's observations 

 in that the branchiostegal lobe is angular and that the five anterior 

 abdominal somites have flattened median dorsal posterior projections. 



Table 6. — Measurements of Gnathophausia elegans illustrating changes in relative 

 lengths of rostrum and posterolateral spines of carapace that accompany growth 



« Broken. 



Family EUCOPIIDAE Dana 



Eucopidae Dana, 1852a, p. 19. 



Definitions. — Carapace very large and membranous; second to the 

 fourth pairs of thoracic limbs developed as gnathopods; fifth to the 

 seventh pairs of thoracic limbs very long and slender, subchelate; 

 eighth pair of thoracic limbs developed as normal pereiopods. 



Remarks. — Only one genus, Eucopia, is included in this subfamily. 

 Four species have been described. Hansen (1910, p. 20) has given 

 a key for their identification. 



Genus EUCOPIA Dana, 1852 



Chalaraspis Willemoes-Suhm, 1874a, p. xiv ; 1875, p. 39. 

 Eucopia Dana, 1852a, p. 19. 



EUCOPIA SCULPTICAUDA Faxon 



Eucopia sculpticauda Faxon, 1893, p. 218 ; 1S95, p. 219, pi. K, figs. 2, 2d ; pi. 53, 



figs. 1-10; 1896, p. 164. 

 Eucopia intermedia Hansen, 1905a, p. 5, figs. 2-3. 

 Eucopia australis (pars) G. O. Sars, 1884, p. 10; 1885, p. 55, pis. 9, 10. 



Occurrence. — East coast of North America: Albatross stations 

 2083, 1 specimen; 2094, 1 specimen. West American coast: Alba- 



