Phyllopoda of Australia. 255 



5. Estheria dictyon, S. and H. (PI. XXXVL, Fig. A). 



Report Horn Expedition, Zoology, ii., p. 236, figs. 6-8. 



Shell much smaller (about 8 mm.) than E. lutraria, more 

 compressed, of a thinner consistency, but quite similar in lateral 

 outline to E. lutraria. Ridges equidistant (about 10), bearing 

 stout bristles, sculpture forming irregularly hexagonal spaces. 

 Dorsal plates bearing about eight long, slender denticles, anterior 

 pair in front of anal setae very long, slender, and curved hind- 

 wards. Dorsum of last few segments of trunk each with a stout 

 spine, mox'e anteriorly with four transversely set ones ; caudal 

 claws unclothed, or bearing but few feathered setae. Head 

 agreeing with E. lutraria, but eyes not confluent, separated by a 

 narrow line. 



Locality. — Palm Creek, in the James Range, Central Australia 

 (S. and H). 



Remarks. — I am inclined to regard this as but a young form 

 of E. lutraria ; the specimens I have are rather macerated, and 

 scarcely well enough preserved to allow of the dissection of the 

 animal ; also there are no males for comparison. 



Synopsis op Local Species. 



1. Shell more or less tumid, umbones well defined and placed 

 far in front ; ridges comparatively very many, sculpture, 

 radiating lines variously formed. Upper distal ex- 

 tremity of head produced to a distinct linguiform 

 projection overlying the distal part of cervical segment. 

 Dorsal denticles of tail-piece small, very numerous, and 

 unequal in size. — packardi. 



^. Shell seen laterally of a ratlier regular elliptical form, ridges 

 about 14 in number and near the margin many 

 secondary lines of growth, sculpture irregularly reticu- 

 late. Upper distal extremity of head, seen laterally, 

 bent at nearly a right angle ; rather prominent in front 

 of eye ; tail similar in shape and armature to previous 

 species, caudal claws rather slender, without any 

 feathered setae at the base, their outer part distinctly 

 denticulated. — elliptica. 



