1S85.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 169 



and densely pubescent sulcus in place of the mucli broader and con- 

 spicuous sulci upon all the somites of Nephrops Norvegicus. The de- 

 pressions on the bases of the pleura are deeper than in Nephrops Nor- 

 vegicKS, and the inferior angles are more obtuse, and not distinctly 

 hooked, as in that species. The second to the fifth pleopods are smaller 

 and their lamellje much narrower than in the Hornarns Americanus or 

 the male of Nephrops Norvegicus. [I have had no female Nephrops for 

 comparison.] 



Measurements in millimeters. 



Length from tip of rostrum to tip of telson 142. 



Length of carapax, including rostrum 69.5 



Length of rostrum 24.3 



Length of rostrum in front of spines 13. 



Breadth between tips of antennal spines 21.5 



Greatest breadth, at branchial regions 25. 



Height of carapax 26. 



Length of eye-stalk and eye 6. 



Greatest diameter of eye 7.0 



Length of antennal scale 4. 1 



Breadth of antennal scale 2.0 



Length of left cheliped 112. 



Length of merus 32. 



Length of carpus 22. 



Length of chela 54. 



Breadth of chela 12. 5 



Length of dactylns 24. 



Length of second perseopod 69. 



Length of merus 23. 



Length of carpus 10. 5 



Length of chela 18. 5 



Breadth of chela 3. 



Length of dactyluS 6. 



Length of third peraiopod 65. 



Length of merus 19. 5 



Length of carpus 9. 6 



Length of chela 20. 5 



Breadth of chela 2. 8 



Length of dactylns ., 6. 



Length of fourth perseopod 67. 



Length of propodus 15. 6 



Length of dactylns 8. 7 



Length of fifth perjeopod 58. 



Length of propodus , 15. 



Length of dactylns. 7.0 



Length of sixth somite of pleon 13. 



Length of telson 16.0 



Breadth of telson 13. 3 



Length of inner lamella of uropod 14.0 



Breadth of inner lamella of uropod 13. 3 



Length of outer lamella of uropod 19.0 



Breadth of outer lamella of uropod 14. 



