Phreatoicusyrom Tasmania. 351 



subequal and arc longer and more slender than the first. 

 The flagcUum is almost as long as the peduncle and consists 

 of seven joints, the last being very minute. 



The second antenna^ rcfsemblc those of P. australis, the 

 flagellum consisting of about twenty joints and somewhat 

 exceeding the peduncle in length. 



The upper and lower lips and mandibles appear to be very 

 like those of P. australis. Both pairs of maxillfe appear also 

 to ap])roximate very closely to that species, only in the first 

 pair the teeth are smooth in the dried specimens, while in 

 the second pair all the setos seem to be simple, not pectinate, 

 as those on the first lobe are described by Dr. Chilton. 



The niaxillipeds differ slightly from those of the Australian 

 form. The epipodites, which act together as a cover to the 

 other mouth-organs, bear two or three long and a number of 

 short spines on their margins. The plate on the basos which 

 stands at right angles to the surface of the rest of the max- 

 illipcd, and projects beyond the base of the ischium, is very 

 densely setose along its inner margin. I failed in most of 

 my specimens to detect the three hooked spines which in 

 P. anstrah's serve, as Dr. Chilton considers, to keep the two 

 maxillipeds together ; but as I have found them in one, I 

 think they must occur in all, only in the others they have 

 probably been broken ofl', all the parts being in a very dry 

 and brittle condition. The meros is long and slender and 

 bears about seven long setas at its apex. The rest of the 

 limb is as in P. australis, except that there are no sette on 

 the outer margin of the dactylos, which is quite smooth. 



The thoracic legs resemble those of the Australian species. 

 Owing to the condition of my specimens I could not make 

 out the structure of the pleopoda at all satisfactorily. 



The uropoda are very strongly developed and reach con- 

 siderably beyond the telson. The outer ramus is about as 

 long as the basal portion, the inner ramus somewhat longer. 

 The base seems to have a deep longitudinal groove on its 

 upper surface and carries a double row of spines along each 

 edge of this; the rami each bear two or three strong spines 

 on their upper surface and one small seta-like spine near 

 their acute apex. 



EXPLANATION OF PLATE XI. 



Phreatoicus tasmanies. 



Fig. 1. Adult male, x 6. 



Fig. 2. Head and first pah" of antennae as seen from above, X 26. 



Fig. 3. Antenna of second pair, X 16. 



Fig. 4. Maxilliped, X 2G. 



Fig. 5. First thoracic foot, X 20. 



Fig. 6. Telson and uropod, X 12. 



