CKTJSTACBA. -253 



known. In the smallest (immature) female the po8tabdom.en is 

 relatively narrow, and does not, as in the adult, cover the whole of 

 the sternal surface. 



Nursia abbreviata, Bell, must be added to the list of the Australian 

 species of this family, since the specimens in the British-Museum 

 collection are from Moreton Bay, and were purchased with the types 

 of N. sinuata from the same locality. 



105. Nursilia dentata, Bell. 



In the first collection is a female from Flinders, Claii;mont, N.E. 

 Australia, 11 fms. (No. 108), and in the second an adult female and 

 two smaller males from the Arafura Sea, 32-36 fms. (No. 160). 

 These do not differ from the type (a female, without special indica- 

 tion of locality, from the ' Samarang ' collection) in the British 

 Museum, except in the somewhat more prominent spines and mar- 

 ginal teeth of the carapace. 



Mr. Haswell mentions the occurrence of this species at the Ktzroy 

 Islands. • 



There is in the collection of the British Museum a female from 

 the Fiji Islands, Matuka {H.M.S. '■Herald'), in which the small 

 spines or tubercles of the gastric, hepatic, and branchial regions are 

 nearly obliterated, as are also the lobes or teeth of the lateral 

 margins. . 



In the final consignment of the collections of H.M.S. ' Alert ' is a 

 specimen from the Seychelles. Hence this species is evidently dis- 

 tributed throughout the Oriental region. 



106. IpMculus spongiosus, Adams ^ White. 



A small male was dredged in the Arafura Sea, 32-36 fms. 

 (No. 160), which agrees with the larger specimens from the Philip- 

 pine Islands, Corregidor (Cwmmpi), and another specimen without 

 definite locality, from the ' Samarang ' collection, in the British 

 Museum. 



Prof. Bell is certainly right in classing this genus with the 

 LeudosiidsB, and in stating that it has no near affinities with the 

 Parthenopidae, as supposed by Adams' and White. 



107. Arcania pulclierrima, Haswell. 



Arcania septemspinoaa, Bell, Trans. lAtm. Soe. xxi. p. 310, pi. xxxiv. 



fig. 7 (1855) ; Cat. Leucos. Brit. Mus. p. 21 (1855). 

 Arcania pulcherrima, Haswell, Proc. Linn. Soe. N, S. Wales, iv. p. 68, 



pi. vi. fig. 4 (1880) ; Cat. Austr. Crust, p. 131 (1882). 



An adult female from Prince of "Wales Channel, 9 fms. (No. 157), 

 and a smaller male from the Arafura Sea, 32-36 fms. (No. 160), are 

 referred here. 



A comparison of Mr. Haswell's description and figure oi A.pul- 



