FllKSUWATER C'RAT FISHES OF ArSTHALlA. 159 



abiloniii)al segments. The Yari'a River C'raylisli las Ijeeii 

 tlesci'ibed and figured by McCoy (' Prodronius of Zoology of 

 Victoria,' vol. ii. pi. 160) as Astacopsis serrcitns var. yarraensis, 

 and he refers to its brilliant blue coloui-, but he otherwise regards 

 it as merely a variety of A. serrattis from the Murrav lliver. 



(c) Kennedy's Creek, a tributary of Curdie's River. Two 

 specimens (]8i»7), one measuring 135, the other 100 mm. Both 

 very similar to above. There are four spines on second abdo- 

 minal segment in one specimen, three in the other. The dorsal 

 abdominal spines are well marked, but reduced. 



{d) Plenty River. One specimen (1896), measuring 160 mm., 

 has two spines on right side of tirst abdominal segment, one on 

 the left. There are four .spines on right side of second abdominal 

 segment, three on the left. The dorsal abdominal spines and 

 those on carapace are rather reduced. 



From Nkw .SouTn Wales. 



(e) Paramatta River, 8}dney. T'he Large raramatta Elver 

 Cruj/fish has been figured by Spence-Rate (' Challenger' Reports, 

 vol. xxiv. p. 194, j)l. xxviii.) under Heller's name of Astacopsi.'i 

 spinifer. He regards it, in connnon with McCoy and others, as 

 identical with the Murray River form. 1 have not seen the 

 liirge Paramatta Cmytish, but from the excellent figure given by 

 Spence-Bate 1 cannot detect any ditierence between it and the 

 Murray River foi-m. 



( /■) Paramatta River. 'Jhe ,Small Paramatta Crayfish 

 described and figured l)y Spence-Bate {loc. cit.) as Astacopma 

 paramattensis. It is about 100 mm. long, and is distinguished 

 from the large form (e) by complete i-eduction of spines on cai'a- 

 pace and abdomen to similarly situated small tubercles. It is, 

 however, very probable that this specimen, coming as it does from 

 the same river as the large form, only represents a stage 

 in growth of the large Paramatta Crayfish. Dana's A. nohiiis 

 and Milne-Edwai-ds's A. australiensis both probably belong hei'e. 



A very small specimen (about 50 mm.), described and figured 

 by Spence-Bate {loc. cit.) as A. sydneyensis, is also probabl}^ only a 

 Aery young Pai'aniatta River form. 



((/) The Blue-Mountain Crayfish (PI. XVIII.), found in small 

 streams in the Blue Mountains. The largest specimen obtained 

 by me measured 110 mm. It resembles in every particular 

 Spence-Bate 's small Paramatta Crayfish (/'). The spines on the 

 carapace, branchiostegitts, and abdomen are reduced to small 

 blunt tubei'cles. This is particulai'ly clear if we compare a 

 specimen of this Crayfish with a similarly sized Victorian 

 specimen, e. (/., from the Yarra River. In the latter the dorso- 

 lateral and lateral abdominal spines are far better developed 

 than in the Blue-Mountain or small Paramatta forms. The 

 practical identity of the Blue-Mountain Crayfish with the small 

 Pai-amatta form described by Spence-Bate seems to me to 

 make it inidpsirable to invent another name for it. 



