No. 393.] WORTH-AMERICAN INVERTEBRATES. 715 
31. Epimera of abdomen spined; carapax with more than three keels; 
rostrum simple . . C. salebrosus Owen A 
31 aaa: epimera witli spines; carapax with three carinz, the 
middle one four-spined . C. sharpei Ortmann A 
21. Middle keel three-spined z c. seins (Phipps) Fabr. A, N, Fig. 2 
32. Epimera without spinules; a median carina on abdomen, the sixth 
segment with two carine . ; C. intermedius Stm. A, Fig. 44 
32. Epimera without spinules; abdomen not sculptured, 3% 
33. Second lateral carina complete C. munitus Dana, Fig. 48 
pic 
, 33. Second lateral carina extending half the length of the carapax 
€. munitellus Walker P, Fig. 31 
34. A spine on each side of the posterior margin of fifth ana 
segment; palm very oblique . C. franciscorum Stm. P, D, Fig. 3 
35. Fifth abdominal segment without spines 
C. vulgaris Fabr. A, D, P, N, M, Fig. 1 
G. Sabinea Owen. Rostrum very short; eyes free, stout; second pair 
of feet short; branchiæ seven. 
36. Rostrum obtusely rounded; telson subtruncate 
S. septemcarinata Ross N, Fig. 4 
36. Rostrum and telson acute . : S. sarsii Smith N, Fig. 5 
G. Pontophilus Leach, Sars. Restrain short, eyes free, second pair of 
feet very short. 
37. Rostrum very short, tridentate . ; . P. brevirostris Smith M 
37. Rostrum longer . . P. norvegicus Sars N, M 
G. Nectocrangon Brandt. Dactyli of fourth and fifth pairs of feet 
dilated. 
38. Two spines in the middle line of the carapax behind the rostrum 
N. lar (Owen) Brandt N, A 
38. Three spines behind rostrum ‘ N. alaskensis Kingsley A 
G. Paracrangon Dana. Rostrum doni fourth and fifth pairs of feet 
acuminate. 
39- P. echinatus Dana P, Fig. 54 
— Sub-faiily Lysate ‘ie of second pair annulate ; external max- 
Py pediform 
C Hitbetysmate Stimpson. Four anterior pairs of feet with exopodites ; 
first pair stout, second slender. 
. Branchiostegal spine present ‘ 
40. No branchiostegal spine Æ. ucts (Gibbes) Stm. M, S, Fig. 
41. Flagella of antennula nearly as long as body ; antennal scale tapering 
. intermedia Kingsley S, Fig. 7 
. Flagella of antennula 1% times length of bodii; antennal scale broad 
H. calffornica Stm. D Fig. 8 
G. Tozeuma Stimpson. Body elongate, ros ery long; external 
ET very short; carpus of third pair triarticula 
42. T. carolinensis Kingsley M, S, Fig. 18 
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