Mr H. Goodsir on the Genus Cuma. 129 



as a means of prehension. Tliey free themselves with great 

 dexterity from any weight which may happen to fall on them. 

 I have often placed the point of a needle on their thorax and 

 pressed them down into the sand; the animal immediately 

 frees itself with very little apparent trouble, by means of its 

 tail. The extremity of the tail is placed against the needle with 

 one of the styles on either side of it, and by pressing upwards 

 in this way, it soon regains its liberty. 



They frequent sandy banks, and chiefly those where there 

 is a little sea-weed. 



DESCRIPTION OF THE PLATES. 



Plate 11. 



Fig. 1 . Cuma Edwardsii. 

 ... 2, 8, 4, 5. Organs of the moutli. 

 ... G. ^■\ataT:il size o{ Cuma Edwardsii. 

 ... 7. A superior and an inferior footjaw. 

 ... 0. One of tlie inferior antennce. 

 ... 9. One of the second pair of compound feet. 

 ... 10. One of the first pair of compound feet. 

 ... 11. One of the first pair of simple feet. 

 ... 12. One of the second pair of simple feet. 

 ... 13. Caudal styles. 



... 14. Enlarged view of Cuma Audouinii. 

 ... 15. Natural size. 



... IG. One of the first pair of compound feet of C. Audouinii. 

 ... 17. One of the abdominal appendages of Bodotria areuosa. 

 ... 18. Portion of the shell of Cuma Edwardsii, very mucli magnified. 



Plate III. 



Fig. 1. Enlarged view of Cuma trispinom. 

 ... 2. Natural size. 

 ... 3. One of tlie first pair of legs. 

 ... 4. One of the second pair of legs, 

 ... 6, One of the caudal styles. 

 ... 6. One of the simple legs. 



... 7. Enlarged view of the carapace of the Cuma trispinosa. 

 ... 8. Bodotria arenosa, 

 ... 9. Natural size. 

 ... 10. One of the first pairs of legs. 

 ... 11. One of the second pairs of legs. 

 ... 12. Enlarged view of anterior part of carapace, 

 ... 13. One of the caudal styles. 



VOL. XXXIV. NO. LXVII. JANU.VUY 10 t3, I 



