A REVISION 0|- riTK AI'STR AI.IAN HM;i>M h.T. IIKhl.KY. 285 



Sliell small, solid, aciculai-, contracted at tlie baseband a little excavate 

 below the suture. Whorls ei^ht, three and a hall' ul' wtiich form the 

 protoconch, of which the iipex is piodnced and the third whorl is keeled. 

 Colour faded in ni^- examples, but the oi-al callosities retain a brown oi' 

 yellow stain. Sculpture: — On tlie upper whorls are two spirals, and on 

 the last eleven, which l)ecoine closer and smallei' anteiiorly ; the radials 

 are stout round-backed ribs, which bulge at the periphery of the upper 

 whorls, and aie set at seven oi- eiglit to a whorl. Apeiture : — The mouth 

 is triangular, contracted by a bend of the lip; sinus horizontal, spout-like, 

 with a C section ; columella with two or three small ti'ansverse plaits ; 

 canal short, a little recurved. Length -tS mm., breadth 1-6 mm. 



This has a general resemblance to (Uyphoatunm trifjoiwstomd Hervier,"" 

 but the Queensland shell is smaller, tapers more sharply to a point, is 

 more contracted at the sutures, and has fewer spirals. 



Hid'. Queensland : — 5 to 8 fathoms, Muri'a\' Island (t>'pe) ; 5 to 10 

 fatlioms, Hope Island (self); 20 fathoms, Darnley Island (Braziei'); 20 

 fathoms, off Endeavour Reef (McCulloch). 



1 Jl KN A in 1 1 A Jom^^cmi tiic. 



Lieiiardia Jousseaume, Bull. Soc. Zool. France, ix., 1884, p. 18-i, type 



Clavatida ruhidn Hinds. 

 Thetido^i Hedley, Mem. Austr. Mus., iii., 1899, p. 472, type Thefidus nwrsani 



Hedley. 



This well marked genus is a characteristic associate of reef corals. 

 Typically the shell is brightly coloured. It is ovate, very solid, with stout 

 undulating radial ribs crossed by sharp elevated cords. Within the lip 

 and on the columella are entering deuticules, but the columella denticules 

 are more deep seated than in Etrema. The varix has a blunt labial 

 margin ; it does not extend a thin broad and wing-like expanse towards 

 the apertni'e as with Etrema. The anal fasciole is traversed by spiral 

 threads and is distinguished by the cessation of the radial sculpture, 

 which does not intrude on a subsutural space. The sinus inclines to a 

 subtubular form. The apex is small, and subulate with one smooth 

 helicoid whorl followed by another glossy whorl with a sharp thread keel 

 on the shoulder. The apex figured (Plate xlix., fig. 102) is from a specimen 

 of L. rnhidd taken by myself under a stone at low tide in Milne Bay, 

 Papua. 



Under the subgeneric title of Acrista, with L. puiirtilht Hedley for 

 type, I now propose to distinguish a small party of diminutive shells: — 

 L. ccelata Garrett, disconica Hervier, gaidei Hervier, niarrhei Jousseaume, 

 multinoda Hedley, and nemiliiienta Garrett, associated by a sculpture of 

 compressed beads, trigonal aperture, and lop-sided apex. 



TliotidoK may serve for another subordinate group, including species 

 with fewer and more massive labial denticules such as L. inortivrd Hedley, 

 for the reception of which Pease ^'' suggested '■^Borsoni <(.''' 



'6 Hervier— Journ. de Conch., xliv., 1896 (1897), p. 93, pi. iii., fig. 23. 

 " Pease— Proc. Zool. Soc, 1860, p. 143. 



