101 Dr. W. B. Bcnluim on an 



XIV. — An Erroneous Kchinodermal Identification. Cor- 

 rected by W. B. BenhaM, D.Sc, F.R.S., Otago University, 

 New Zealand. 



Nearly thirty years ago, some specimens of a sea-urchin 

 were received from Stewart Island, New Zealand, at the 

 Otago University Mustum, and were identified by the late 

 Capt. Button as "■ Salmacis glohator, Agassiz/' and briefly 

 described in the Trans. N. Z. Inst. xi. p. 306. 



I was recently engaged in identifying specimens of 

 Echinoderms handed to me by Mr. Edgar Waite, who had 

 collected them during an experimental trawling-trip off the 

 New Zealand coast, and having read Mr. Farquhar's note in 

 the current volume of the 'Transactions N. Z. Institute ' 

 (xxxiv. p. 130), wherein he suggests that our " Salmacis " 

 may probably belong to Bell's species S. alexandri (P. Z. S. 

 1880, p. 431), I proceeded to look into tiie matter, with the 

 result that I find that our New Zealand urchin does not 

 belong to the genus Salmacis ^ wox t\ en to the family Temno- 

 pleurida^, but is a member of the family Echinidse. In fact, 

 it is a species of Pseudecfnnvs, ]\Iortensen, 1903, of which 

 the genotype is P. albocinclus, Hutton (Cat. Ech. N. Z. 1872), 

 which he later regarded as a synonym of Echinus rnagel- 

 lanicus, Philippi (Trans. N. Z. Inst. ix. p. 362). 



Although I have not been able to refer to Mortensen's 

 work, yet the diagnosis of this given in Bronn's ' Class, und 

 Ordn. d. Thier-reichs,' by Otto Haniann, enabled me to 

 place it in that genus at once — not only by the arrangement 

 of the pores, but also by the character of the '' globiferous 

 pedicellariie." 



FseudtcJiimis huttoni^ sp. n. 

 (= Salmacis ylobator^ Hutton, non Agassiz.) 



" The test is white with pink tubercles ; the integument 

 pale brownish yellow. The spines in the upper portion are 

 reddish purple with white tips ; on the lower portion they 

 are white, getting yellow towards the base " (Hutt. Tr. xi. 

 p. 307). 



The specimens thus briefly described by Hutton are still 

 mounted on a tablet and labelled in his handwriting ; they 

 are two in number, one with spines, the other denuded. 



The former measures 52 mm. in diameter and 35 mm. in 

 height ; the latter 42 and 34 respectively. 



In the latter the interambulacrum at the ambitus measures 



