220 CRUSTACEANS. 



segment, and the last segment itself terminated in a fork. The resem- 

 blance of the young to the parent was such, that whatever metamor- 

 phoses succeed, they take place at an early stage. — Fig. 17, the young 

 Asteracilla, magnified. 



The young gradually augmented in number, ultimately amounting 

 to about thirty. 



From what could be seen, there were obviously four pair of limbs, 

 the first at some distance above the rest, besides some false feathered 

 limbs. 



This creature was found on the 2d of March, among the residue of 

 miscellaneous collections from the sea. 



Plate LXII. 



Fig. 15. Asteracilla caudatce. 



16. The same, enlarged. 



17. Young Asteracilla, magnified. 



§ 3. ASTACILLA LONGICORNIS. — Plate LXIII. figs. 1, 2, 3, 4. 



This is an animal distinguished by such singular appearance and 

 habits, that neither can escape the notice of the least observing. As if 

 confined within a long cloak, the limbs are employed to secure its sta- 

 bility ; two monstrous horns load the head, and in reposing, as it grasps 

 the slenderest twig with its six hind feet, while all the body is bent back 

 above the point of fixture, it actually seems broken backed. 



The Astacilla, whose generic name it has been proposed to convert 

 to Arcturus, extends two inches from the tip of the antennte to the ex- 

 tremity of the tail. 



The body is subcylindrical, composed of eight unequal segments, 

 from which four pair of jointed limbs originate, and, at a considerable 

 interval lower down, other three pair of plain limbs armed with claws. 

 These three pair spring from a segment equalling half the length of the 

 whole animal, which terminates in a caudal segment of fohaceous struc- 

 ture below, besides the two large antennae of five articulations each, and 

 two short feathered antennular organs under them ; there is an eye on 



