No. 393-] 
NORTH-AMERICAN INVERTEBRATES. 
717 
55. Basal joint without external spine; dactylus normal . > 550 
56. Upper margin of large hand notched, lower entire 
. floridanus Kingsley S, Fig. 42 
56. Larger hand constricted above and below 
A. heterochelis Say M, S, west coast Fig. 43 
57. Dactylus working horizontally 
57. Dactylus completely inverted 
58. Hands of first pair equal 
58. First pair of hands unequal . 
A. candei Guerin S, D, Fig. 36 
è ‘ i > ` ‘38 
. A. longidactylus Kingsley D 
A. harfordi Kingsley D, Fig. 12 
G. Hippolyte Leach. Rostrum not joined to carapax; external maxil- 
lipeds slender ; first pair of feet short, equal. 
number of species, mostly from the colder seas. 
a key to the North American species at the present time. 
Hippolyte contains a large 
It is impossible to frame 
The following 
list includes the species found in our limits. 
59. H. afinis Owen D, Fig. 15. 
H. brevirostris Dana P, Fig. 57. 
H. californiensis Holmes, Fig. 
16. 
H.: cristata Stm. P 
H. esquimaltiana Bate P. 
H. fabricii Kroyer N, Fig. 29. 
H. gaimardii M.-Edw. N, P, 
Fig. 28. 
H. gracilis Stm. P. 
H. grænlandica (Fabr.) Miers. 
H. hemphilli Lockington, Cali- 
fornia. 
y herdmanni (Walker) P, Fig. 
= i Buchholz N. 
H. lamellicornis Dana P, Fig. 
50. 
G. Caridion Goës. 
H. layi Owen D, Fig. 14. 
H. macilenta Kröyer N, Fig. 33. 
H. microceros Kr. N, Fig. 25. 
H. palpator Owen D, Fig. 55. 
H. panschii Buchholz N. 
1. te Age Kroyer N, A, P, Figs. 
24. 
H. tas Stm. D. 
H. polaris (Sabine) Owen N, Figs. 
H. prionota Stm. P, Fig. 41. 
H. pusiola Kr. N, M, Fig. 22. 
H. securifrons Norman N, Fig. 39. 
H. sitchensis Brandt A. 
H. spinus ago gh White N, A, 
P, Figs. 32, 
H. stylus Stm. P 
H. suckleyi Stm. P. 
H. taylori Stm. D. 
Rostrum elongate, three-jointed mandibular palpus, 
carpus of second pair we aa at biarticulate. 
60. 
. C. gordoni (Bate) Goés N, Fig. 51 
G. Orois stm. Ramm very short. mandibular palpus two-jointed ; 
carpus of second pair triarticulate. 
61. 
; O. alpherostris Kingsley M, Fig. 35 
G. Virbius Stm. PEER biflagellate ; carpus of second pair triartic- 
ulate. 
62. No hepatic spine ; antennal scale moderate. 
62. Hepatic spine present 
V. acuminatus dees Stm. Gulf weed 
. 6 
