On Decalopoda australis, Eights. 37 



movable articulation, small, sub-clavate, and perforated at 

 its extremity by an anal incision. 



**D. australis. 



"Entire animal of a bright scarlet; disc of the thorax 

 convex, beneath slightly so; on the superior surface of the 

 tubular joints, near the margin, are situated about four very 

 small rigid spines; basal joint of the chelicerse elongated. 

 Pal'pi with the third and fifth joints elongate, the former of 

 greater length than the latter. Egg-hearing organs with 

 the three first joints small and sub- equal, fourth and sixth 

 elongate, the remainder nearly equal; the four terminal 

 joints are prehensile, and have their inner margins dentated, 

 the teeth arranged in about four longitudinal rows. Legs 

 long and nearly equal, posterior pair rather smaller ; joints 

 of the coxae short and sub- equal. Thighs about twice the 

 length of the coxse, furnished with small spines at their 

 superior extremity. The first joint of the tibia equal in 

 length to the thigh, the other rather longer. Tarsi as long 

 as the thigh; the last joint of the tibia and those of the 

 tarsi, each armed at their extremities beneath, with four 

 rigid spines. Eyes very small. Teguments pergamineous. 

 Habitat. Sea in the vicinity of the New South Shetland 

 Islands." 



I have summarised the foregoing characters as follows, 

 without, it is hoped, losing any of the essential points. 

 The setaceous character of the palps is the only feature in 

 which the South Orkney specimens do not agree with those 

 of the South Shetlands. 



Genus Decalopoda, Eights. 



Body, including lateral processes, elliptical, smooth, not 

 always distinctly segmented, with five pair of ambul- 

 atory appendages ; cephalic portion wide, with a 

 constricted neck. 



Prohoscis — longer than the body, clavate, bent downwards. 



Abdomen — Long, slender, sub-clavate. 



Mandibles — Three-jointed, chelate, well developed. 



Paljps — Ten-jointed. 



