A KKVISION (IK I'lIK AUSTRALIAN TlJl;Ull>* HKIU.KY. 305 



Pakaci.atuukella Jloettyer. 



Paraclathurella Boettger, Nachr. Malak. Gesell., xxvii., 1895, p. 56, type 

 Pleiirotonin tjracilentit Reeve. 



In Parafhitlinrelh( Dr. Boettgei' establislied a valid genus foi- P. 

 i/racihidit ai\(l its vai'ieties, but his classification appears to have depended 

 on snpei'ticial cliai'acters of subcylindtical form and delicate sculpture in " 

 which spirals exceed radials, for his judgment was depreciated by the 

 addition of the following incongruons species — P. dxin Reeve, exunla Reeve, 

 iiiscidpta Adams and Angas, Urata Reeve, rissDules Reeve, and suhula 

 Reeve — heie distributed among Hemidaphiie and Guralean. 



Paritchithnrella has the first two whoi'ls fprotoconcli) depressed- 

 turbinate, quite smooth, the initial one a little tilted. Sculpture commences 

 with the advent of four minutely-beaded spirals. lladials follow, develop 

 a reticulation, become wider spaced, and gradually predominate, thus 

 introducing the adult sculpture. A secondary microscopic sculpture later 

 occurs of grained threads. Varix narrow, in which is excavated a squarely 

 U-shaped sinus ; outer lip with a narrow free edge ; no teeth on columella 

 or lip. 



These characters I read as indicating a relationship with Eacithara; 

 from that Paraclathurella is distinguished by elongate form, radial sculp- 

 ture, and toothless mouth. 



PaKACLATHUKKLLA ADITICOLA sp. UOV. 



(Plate li., fig. 125.) 



Shell of modei-ate size for the genus, cylindro-fusiform. Whorls 

 seven. Colour uniform buff. Sculpture: — Radials consist of distant, low, 

 round-backed ribs, discontinuous from whorl to whorl, undulating the 

 sutui-e, and set about eight to a whorl; on the upper whorls the ribs are 

 comparatively closer and higher; on the last whorl are about twenty fine 

 grooves, cutting the surface into fl^at-topped spirals ; on the penultimate 

 there are about ten of these. Aperture : — The mouth is elongate-pyriform, 

 vpithout teeth on either side; no varix; outer lip thin, and scarcely 

 inflected at the sinus; canal a notch. Length 8 mm., breadth 25 mm. 



Compared with P. gracileida var. portin Smith, the shape of the 

 novelty is more fusiform, and the whorls increase slower, the spii'als 

 smaller and more numerous, but the radials are fewer and moi-e prominent. 



Hah. Queensland : — 4 to 14 fathoms, Albany Passage (type); Mapoon 

 (self). 



Paraclathi;kh:i,i,a clothoms xp. nov. 



(Plate li., fig. 126.) 



Shell small, slender, cylindro-fusiform. Colour uniform dull grey. 

 Whorls six, of which half comprise the protoconch, the first two whorls of 

 which are smooth, the next sculptured v\'ith radial arcuate wrinkles. 



