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REPORT ON ZOOLOGY, MDCCX‘XLII : 
FaB.) ; H. microceros, new species from Greenland. The same author 
(Natur. Hist. Tidsskr. iv. p 217) has illustrated the northern species of 
Crangon, He divides them into three genera : Argis, Kr., without ros- 
trum, the eyes almost concealed under the carapace, parallel, much 
longer than thick ; branchiae and second pair of feet as in Crangon ; the 
legs of the fourth and fifth pairs dilated at the point ; swimming feet : 
Crangon lar, Owen. Crangon, in its present limits, has a short ros- 
trum, free diverging thick eyes, five pairs of branchiae (no absorbed 
branchia on the foot-jaws of the second pair), the second pair of feet 
ending in claws, the legs of the fourth and fifth pairs pointed, ambula- 
tory feet : Cr. boreas, Phipps ; Cr. nanus, small new species found in 
the South Cattegat, and Cr. vulgaris, F. Sabinea, Owen, differing from 
Crangon by six pairs of branchiae, and also by the branchial rudiment 
present on the fore-feet of the second pair, and by a very short second 
pair of feet without claws ; with the species 8. 7-carinata, Owen ; Cran- 
gon '7-carinata, Sabine, Edw. 
The genus Cuma, Milne Edw. (Ann. de. Sc. Nat. xiii. p. 292), and 
which was afterwards rejected by the same author (Hist. Nat. d. Crust. 
iii. p. 553), with the remark, that it is probably the larva of a Decapod, 
has been pointed out by Kroyer (Naturh. Tidsskr. iii. p. 503. t. 5, 6. — 
Isis, 1842. p. 915), who found eggs in a female, as a perfect form and an 
independent genus, which is increased with four new species, viz., — C. 
Edwardsii, from the South of Greenland, apparently blind ; C. RathJcii, 
nasica and lucifera, in the Cattegat. All these species have five seg- 
ments of the anterior part of body, besides the cephalic portion, while 
Edward’s C. Audouinii has only four. 
STOMOPODA. 
Caridioides. — H. Goodsir (James. Edinb. N. Phil. Journ. xxxiii. p. 174. 
t. 2.) has described a new genus and three new species of this family. 
The new genus, Themisto, has a near relation with Mysis, and is distin- 
guished by the first, second, and fifth pairs of the caudal members being 
jointless and simple ; those of the third and fourth pairs are more 
strongly developed ; cleft feet. To this two of the new species belong : 
Th. longispina and brevispina; the third is Cynthia Flemingii : all 
three are from the Frith of Forth. 
AMPHIPODA. 
Gammarina. — This family has been enriched by Kroyer (Naturh. Tidsskr. 
iv. p. 141.) with a number of new northern genera and species. The 
new genera are : — Opis, agreeing with Anonyx, even to the very large 
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