70 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY, 



lower margin with a strong slightly curved tooth which 

 reaches to near the middle of the basal joint, and forms 

 with the dentate tubercle of that joint, a powerful grasping 

 apparatus; the third joint is covered with minute spines 

 for about three-fourths of its length, the remaining fourth 

 being covered with fine cilia, the fourth joint is also 

 covered with cilia and has the lower distal part produced 

 into a strong spine, the following formula shows the 

 proportional lengths of the joints : — 



17 . 11 . 16 . 6 

 12 3 4 

 Antennae two-jointed and of moderate size, with a small 

 one-jointed secondary branch arising from near the middle 

 of the lower margin of the basal joint and furnished with 

 four setae. Mandibles small, with a few serrated teeth 

 on the truncate apex, mandible palp very small, with 

 ciliated margins and bearing three setae on the apex. 

 ?daxillae and foot-jaws somewhat similar to those of a 

 typical Laoplwnte, the second joint of the posterior foot- 

 jaw long and slender, being about four times longer than 

 broad, the terminal claw is also long and slender and is 

 considerably longer than the second-joint. First pair 

 of swimming feet similar to those of a typical Laoplwnte, 

 outer branch composed of two joints. Second pair of 

 swimming feet rudimentary, consisting of a single one- 

 jointed branch, bearing three setae at the apex, the innermost 

 being longer than the other two. Both branches of the 

 third pair of feet two-jointed, the inner branch being 

 slightly shorter than the outer. The fourth pair of feet 

 has the outer branch three-jointed and the inner two, the 

 basal joint of the outer branch is nearly as long as broad 

 and is equal to the combined lengths of the second and 

 third joints, the first and second joints have each one stout 

 ciliated spine on the outer distal angle, the second joint 



