^08 MOLLUSCA OF MAST HEAD REEF, QUEENSLAND, II., 



MiTRA CAPRICORNEA, n.sp. 



(Plate xvi., fig. 10.) 



Shell minute, slender, conical, solid. Whorls five, of which 

 two compose the protoconch. Colour: various shades of brown 

 from chocolate to ochre, or lilac, usually monochrome, but some- 

 times with two narrow spiral dark lines on the upper whorls. 

 Sculpture: protoconch smooth, remainder with broad, wave-like 

 well spaced, radial ribs, about eleven to the whorl, which undulate 

 the suture, continue from whorl to whorl and vanish on the base. 

 The last third of the body-whorl is without ribbing. Aperture 

 narrow, columella quadruplicate, the folds diminishing rapidly in 

 size downwards, a thick callus layer on the inner lip, a stout 

 tubercle beneath the hook of the right insertion, about six deep- 

 seated spiral lyrse on the parietal wall. Height 3-85 mm. ; breadth 

 1-75 mm. 



Several specimens from 17-20 fathoms. 



The form varies; some are stouter, others more slender. In 

 general appearance the novelty is like M. nitidissinia Melvill & 

 Standen, from Lifu, but is distinguished by ribbing and duller 

 surface. 



COLUBRARIA ANTIQUATA Hiuds. 



Triton antiquatus Hinds, Proc. Zool. Soc. 1844, p,21. 



This species ranges from Torres Straits, whence it was reported 

 by Melvill & Standen,^' south to Sydney. Brazier has named 

 specimens from New South Wales Triton coxif and others from 

 Queensland Tritonium angasi-X Pease has added a synonym in 

 Triton crenulatus.% The generic position of the species was lately 

 revised by Dr. DalLjl 



Melvill* Standen, Journ. Linn. Soc. Zool. xxvii. 1899, p. 163. 



t Brazier, Proc. Zool. Soc. 1872, p. 22, pl.iv., fig. 9. 



+ Brazier, These Proceedings, i. 1877, p. 174. 



§ Pease, Amer. Journ. Conch, iii. 1867, p. 233. 



II Dall, Smithsonian Miscell. Coll. xlvii. 1905, p. 135. 



