"ENDEAVOUR" SCIENTIFIC RESULTS. 



ICILJUS AUSTRALIS, HttSWfll. 



(Fig. 16 a-c.) 



Icilius ovalis (part), S'tebbing, 1906, p. 706. 

 Icilius australis, Stebbing, 1910, p. 628. 



Localities. 40 miles west of Kingston, South Australia, 

 30 fathoms, several specimens; Sanders Bank. Kangaroo 

 Island, South Australia, 28 fathoms, two specimens; Shoal- 

 haven Bight, New South Wales, several specimens, 15 miles 

 N.W. Cape Jervis, South Australia, 17 fathoms, one 

 specimen. 



I think all these specimens must be referred to Icilius 

 australis, Haswell, as defined by Stebbing in 1910. He had 

 previously considered all the species of Icilius to be 

 synonyms of Icilius ovalis, Dana, but in 1910 prefers to 

 recognise the four species as distinct. He divides them 

 into two groups, the first containing 7. ovalis, Dana, and 

 7. danae, Stebbing, having the pleon segments produced 

 dorsally into a median tooth; the second containing 

 7. australis, Haswell, and 7. punctatus, Haswell, with the 

 pleon segments not produced. The "Endeavour" speci- 

 mens come under the second group and, on the whole, agree 

 fairly well with Stebbing 's description and with specimens 

 named 7. australis, Haswell, sent tame from the Australian 

 Museum. In one or two points, however, they seem to 

 come a little nearer to 7. punctatus, Haswell, and I should 

 not be surprised if these two species have to be again 

 recombined. In the fifth peraeopod the shape of the basal 

 joint (Fig. 16 a) is pretty much the same as that shown 

 in Stebbing 's figure, having a narrow bulge at the top, 

 though the difference between this and the corresponding 

 part of 7. punctatus seems to be slight. I am giving a 

 drawing of the third uropod (Fig. 16 c) showing the inner 

 branch which was wanting in Stebbing 's specimen. This 

 shows that the inner branch is almost identical with that 

 drawn for 7. punctatus by Stebbing, but that the outer 

 branch is longer and has more setae on the lateral margin, 

 thus agreeing with the description of this joint for 

 /. australis. The drawing is made from a specimen taken 

 off Kingston, South Australia, but in specimens sent from 

 the Australian Museum the outer branch of the third 

 uropod is shorter and has only one or two setules on the 

 outer margin, being thus intermediate in character and 

 approaching that of 7. punctatus as drawn by Stebbing. 



