148 THE voya(;e of h.m.s. challenger. 



Circe minima (Montagu). 



Vemis minima, Montagu, Test. Brit.j p. 121, jil. iii. fig. 3. 



Circe minima, Forbes ami Hanley, Brit. Moll., vol. i. p. 446, pi. xxvi. figs. 4, .5, 6, 8, and PI. JL 



fig. 3. 

 Circe minima, Jefifi'eys, Brit. Cuucli., vol. ii. p. 322, vol. v. ji. 183, pi. .\xxvii. fig. G. 

 Circe minima, Romer, Monog. Venus, vol. i. p. 214, pi. Iviii. tig. 4. 



Habitat. — Tenerife, Canary Lslands, 70 fathoms ; also Station 75, off Fayal, Azores, 

 in 450 fathoms. 



To give, the complete synonymy and references for this species would probably occupy 

 a whole jJage or more. It is sufHcient to say that I concur in the view taken by Jeffreys, 

 Hanley, and others, that the Mediterranean form, Circe cyrilli, should not be held sjaeci- 

 fically distinct. The species is variable in form and sculpture, as demonstrated by any 

 considerable series from any one locality. 



Circe angasi,^ n. sp. (PI. II. figs. i-ie). 



Gouldia austrah's, Augas, Proc. Zool. Soc. Lond., 1865, p. 459 ; 1867, p. 928. 

 Circe australis, Smith, Proc. Zool. Soc. Lond., 1881, p. 491. 



Habitat. — Port Jackson, New South Wales, at a depth of 2 to 10 fathoms. 



This species is apparently always small, rather trigonal, convex, inequilateral, thin, 

 glossy, of a pinkish-red tint, whitish towards the utu bones, which are tipped with a deejier 

 red, also ornamented wdth concentric white lines and narrow zones, and frequently exhibit- 

 ing two pale rays, more distinctly seen within the shell, one towards each end of the 

 valves. The luuule and the upper part of the dorsal area arc also stained with the 

 same deep colour as the beaks. The sculptui'e consists of moderately coarse lines of 

 growth, the strife towards the anterior end being deeper, and the intervening sublirae 

 coarser than at the opposite extremity. The umbones are prominent, moderately acute, 

 a little incurved, and placed well forward at about one-fourth of the length from the 

 extremity. The hinder end is more prolonged than the anterior and more sharply 

 rounded. The ventral margin is broadly arcuate, the posterior dorsal oblique, straightish, 

 the anterior being a little concave and suddenly descending. The lunule is elongate 

 heart-shaped, very slightly depressed, and clearl)^ defined. Of the three cardinal teeth in 

 the right valve, the front one is lameUar, the central stouter, somewhat triangular, and 

 the hinder one large, elongate, oblique, and bifid. In the left valve the latter is elongate 

 and very slender, the middle one stout, broadest at the Ijasc, and joined above to the 

 front tooth, which is onl}- half as thick and divergent. The lateral tooth in this valve is 

 conspicuously large and very near to the cardinal. The pallia! line is remarkably 

 remote from the ventral margin, with hardly an)^ indication of a jiostcrior sinus. 



Length 6 mm., height 5, diameter 3^. 



' The name australis having been already used may be changed to aiujasi as above. 



