308 RECORDS OF THE AUSTRALIAN MUSEUM. 



Borda ; 40 to 150 fathoms, Beacbport ; 24 fathoms, Newland Head ; 15 to 

 20 fatlioms, St. Francis Island ; Wallaroo and Port Adelaide (Verco). 

 N.S.Wales: — Middle Harbour, Port Jackson (self). 



PSEUDORHAPUITOMA AXK'II.A >/'. iiur. 



(Plate li., tig. 131.) 



Mmujella hexnguaaliti Bi'azier, Proc. Linn. Soc. N.S.W., i., 1876, p. 162 

 (not PlearotouiK he^t'CujoiKdls Reeve, Coiicli. Icon., i., 1845, pi. xxxii., 

 fig. 293). 



Shell solid, subcylindrical, base rounded, sides flat, and summit 

 delicately tapered. Colour pale buff, uniform but for a tinge of lilac on 

 the columella. Whorls, including the protoconch, nine. Protoconcb with 

 the initial whorl tilted, the first and second smooth and helicoid. Suture 

 linear. Sculpture : — A clathrate sculpture is developed on the third 

 whorl, the next is bicarinate ; later the keels diminish and vanish; the 

 ribs are six to a whorl, elevated, stout, and distant, descending the spire 

 perpendicularly and continuously ; at the anterior extremity the ribs run 

 across the snout; the spirals are even closely-packed threads, numbering 

 about seventeen on the penultimate, and about forty on the last whorl. 

 Aperture: — Mouth very narrow, without denticules on either side; the 

 varix is of the calibre of the preceding ribs; its insertion does not rise 

 above the plane of the suture, and it fills the interval between two ribs of 

 the preceding whorl ; sinus small and shallow ; columella perpendicular; 

 canal short and broad. Length 8 mm., breadth 2 mm. 



From its associates in the genus this species differs as follows : — From 

 P. alticostata, which is nearest, by less elevated ribs and coarser spirals 

 and narrower form ; from P. jiyraiah Hinds, by narrower form ; from 

 P. agna Melvill and Standen, by larger size, sti'aighter ribs, inoi-e slender 

 form, and coarsei' spirals ; and from P. inultlgnnioxd Schepman, by more 

 even sculptuie, smaller size, and narrowei' form. 



Hal). Queensland : — 8 to 12 fathoms, Torres Strait (type, Braziei-) ; 

 4 to 14 fathoms, Albany Passage (self). 



PsEri)Oi;ilAPlllTOMA I'.l I'VRAMinAIA s/-. imr. 



(Plate li., fig. 132.) 



Shell small, rather solid, lanceolate. Coloui' unifoiin white. Whorls 

 eight, including the protoconch. The latter has two and a half whorls, tlie 

 first two being smooth and helicoid ; the next half whorl carries about ten 

 sharp, narrow, arcuate, radiate riblets, quite discordant with the succeeding 

 sculptuie. The adult whorl begins abi-uptly with seven prominent ribs, 

 which descend the whorls vertically and continuously ; these are traversed 

 by spaced spiral cords wliich commence with two on the third whorl and 

 end with seventeen on the last. Between these cords run from two to six 

 rows of densely packed mi(;i oscopic gi'ains. Aperture sublinear ; the thick 

 and outstanding vai-ix extends a broad lip over the month ; sinus semi- 

 circular, cut out of the varix, with a substantial tubercle on the right 



