BY C. HEDLEY. 77 



The length of the largest spirit specimen, from muzzle to mucous 

 pore, was 20 mm., the tail extending posteriorly half that distance 

 from the visceral hump. General colour light yellow, upper surface 

 of tail, mantle lobes, neck, and tentacles bluish-gray. Tail sub- 

 keeled, scarcely diminishing in height posteriorly, suddenly 

 increasing at caudal extremity and terminating abruptly, bearing 

 a well-developed mucous pore above the pedal groove ; a dorsal 

 central groove runs the length of the tail distributing oblique 

 branches which reach the pedal groove. The mantle is divided 

 into left and right triangular shell lobes and two neck lappets. 

 From the lips a well-defined pedal line extends to the mucous pore, 

 from the pulmonary orifice and from a corresponding position on 

 the left side another groove runs to the lips. 



The jaw is that of a typical Relicarion, smooth, lunate, with 

 inferior median limb. 



In the odontophore the rows of teeth curve slowly backwards 

 from the rachidian, which has a slender ovate median cusp and 

 two small accessory cusps, the laterals develop only the distal cusp, 

 and their main cusp is longer and broader than that of the 

 rachidian ; after being repeated for twelve rows this type is 

 succeeded by 20 small unicuspidate marginals. 



This species, the first of its genus recorded from New Guinea, is 

 dedicated to C. W. de Vis, Esq., M. A., Director of the Queensland 

 Museum, as a slight token of the author's regard and gratitude 

 for numberless kind actions. 



16. H. musgravei, n.sp. 

 (Plate x., fig. 14.) 

 Shell globose, thin, brittle, transparent ; pale yellow ; whorls 3-J, 

 rounded ; suture impressed, margined, sculpture minute incre- 

 mental strise ; base imperforate, impressed in the centre, swollen 

 around it ; aperture oblique ovate lunate, lip thin, simple, margins 

 connected by a slight callus, columellar margin reflected. Diam. 

 maj. 6, min. 5, alt. 4 mm. 



T y p e in Queensland Museum. 



