OBSERVATIONS ON THE AST ACID JZ— FAXON. 681 



rior pair of postorbital spines, the rostrum proper being wholly desti- 

 tute of a median dorsal keel. In small specimens the sides of the cara- 

 pace are smooth, or at the most reveal only the slightest trace of low, 

 rounded papillae; but in large specimens, that have attained a length 

 of 115 mm. or more, the sides of the carapace are thickly studded 

 with rounded tubercles. The antennal scale is rather short, and it is 

 broadest in the middle. 



White does not state from what part of New Zealand his type speci- 

 mens came. ' These are still in the British Museum, and belong to this 

 form, judging from the figure in the Zoology of the u Erebus and 

 Terror," and from Miers's brief notice of them, 1 rather than to the 

 following species, P. setosus. 



List of specimens examined : 



Near Dunedin (South Island), ten males, thirteen females (Colls. 

 Mus. Oomp. Zool. and Coll. Dunedin Mus.); Oamaru (South Island), 

 one male (Coll. Dunedin Mus.). 



According to Chilton, 2 P. zealandicus has been found in the western 

 tributaries of the Waiau (in the southwestern part of Otago) and in 

 Stewart Island. 



Of a series of specimens collected in a small valley at Sawyer's Bay, 

 near Dunedin, sent to me by Mr. Charles Chilton, some were taken 

 from small streams affording a small flow of water, while others were 

 captured in a little reservoir, not more than ten feet deep, formed by 

 damming up one of the small streams. The maximum length attained 

 by the individuals inhabiting the streams is about 84 mm. These 

 specimens are sexually mature, as is shown by the fact that some of the 

 females carry young beneath the abdomen. In all these examples from 

 the small streams the carapace is well-nigh destitute of spines and 

 tubercles. The specimens from the reservoir, on the contrary, are all 

 very large, attaining a length of 118 to 158 mm., and heavily tuber - 

 culated on the sides of the carapace, the tubercles having the form of 

 prominent, smooth, rounded papilla}. 



PARANEPHROPS SETOSUS Hutton. 



Paraneplirops setosus Hutton, Ann. Mag. Nat. Hist., 4th ser., XII, p. 402, 1873. 

 Paraneplirops setosus Miers, Cat. Stalk- and Sessile-eyed Crust. New Zealand, 



p. 72, 1876; Ann. Mag. Nat. Hist., 4th ser., XVIII, p. 413, 1876; Trans, and Proc. 



New Zealand Inst., IX, p. 476, 1877. 

 Paraneplirops horridus "S[emper ?] MS./' Miers, Cat. Stalk- and Sessile-eyed 



Crust. New Zealand, p. 73, 1876. 

 fAstaeo'ides tridentatus Wood-Mason, Proc. Asiatic Soc. Bengal, 1876, p. 4. 

 fAstaco'ides zealandicus Wood-Mason, Ann. Mag. Nat. Hist., 4th ser., XVIII, p. 306, 



1876. 

 Paraneplirops setosus Chilton, Trans, and Proc. New Zealand Inst., XV, p. 150, 



pis. xix-xxi, 1882. 

 Paraneplirops neo zelanicus Chilton (in part), Trans, and Proc. New Zealand 



Inst., XXI, pp. 246, 249, pi. x, figs, la, 2a, 1888. 



1 Ann. Mag. Nat. Hist., 4th ser., XVIII, p. 413, 1876. 



2 Trans. New Zealand Inst., XXI, p. 241, 1888. 



