l.'M AMrniroDA normalia. 



1, Atylus cariuatus. (1'latk XXV. fig. 1 ; figs. 2 & 3, yoiing.) B.M. 



Ganiiuarus cariuatus, Fahrieins, Ent. Si/st. ii. p. 515. 3. 

 Alylus caiinatus, Leach, Zooloyical MisccUauy, ii. p. 21. pi. GO; Linn. 

 Trans, xi. p. 857. 



Gucrin, Icon. t. 2G. f. G. 

 LJdivardu, IL'.st. dcs Crust, ill. p. G8. 

 Aiiiphitue carinata, Krot/er, Gron. Amjip. p. 28. pi. 2. f. 6a; Voy. en 

 Scaml. pi. 11. f. 1. 

 Edwards, Hist, dcs Crust, iii. p. 41. 



Ccplialon produced anteriorly into a rostnim, slightly depressed. 

 Central dorsal Une of the whole animal elevated into a carina. 

 The last tAvo segments of the pereion and the first foiu' of the pleon 

 haA"ing the posterior dorsal margin developed into large tooth-like 

 processes. Third segment of the pleon having the inferior margin 

 slightly serrated. Eyes round, small. Antcnnoe not half as long 

 as the animal, subequal ; peduncle as long as the fiagcllum. 

 Gnathopoda small, subequal ; propoda not broader than carpi. 

 Three posterior pairs of pereiopoda having the dactylos reversed 

 in each and the bases unequally developed ; the squamiform 

 character, which is almost wanting in the antepenultimate, and 

 but slightlj' developed in the penultimate, is in the ultimate con- 

 siderably produced. Three posterior pairs of pleopoda unequal, 

 the penultimate not being longer than the peduncle of the ante- 

 peniiltimate ; rami of the antepenultimate reaching rather beyond 

 the extremities of the ultimate, which are naked, subequal, and 

 four times as long as their peduncle. Telson deeply cleft, each 

 division lanceolate. 



Length Ii inch. 



Hab. Arctic Seas {MS. Boi/al College of Surgeoiis) ; Greenland 

 {Kroner). Dredged in 66° N. lat., 50° W. long, {Cap. Warliam and 

 Capt. Harrison). 



The foregoing description is taken from the specimen in the 

 British Museum, being that from which Leach ch'ew up his descrip- 

 tion, and which he states to be the type also of Fabricius's Gam- 

 nutrus cariuatus. 



The habitat of the British Museum specimen is not loiown ; but 

 those in the Hunterian Museum of the College of Surgeons that 

 were entrusted to me are labelled as " Arctic," which, together with 

 Ivriiycr's record of Greenland as being the habitat from whence he 

 procured his examples, leaves no doubt upon my mind as to the abode 

 of the species. 



The young, before they quit the pouch of the parent, attain the 

 length of -:^ths of an inch, and I procured from the same animal 

 several in different stages of progress. The cephalon is at fii'st 

 without a rostnmi, and the i)crcion and pleon without teetJi ; tliese 

 are gradually developed. The llagella are added to the antennae 



