BY C. HEDLEY. 711 



summit of the type. The ground-colour may be in bands or 

 clouds, the articulated dark and white spirals may be developed 

 as broken lines or reduced to dots. 



MiTKA RHODIA Reeve. 

 (Plate xlviii., figs. 15, 16.) 



Notes on the nomenclature of this species have already ap- 

 peared in these Studies (aji^ea, Vol. xxxviii., p. 313). It inhabits 

 the sand and broken shells that litter the floor of the rock-pools. 

 The long proboscis is probably used for .sounding in the sand for 

 its prey. Its movements are slow. Tliere is no operculum. 

 The colour of the animal is uniform cream, against which the 

 small, black eyes are conspicuous. Foot long and narrow, 

 pointed behind, squarely truncate in front. Head rhomboidal, 

 broader anteriorly; tentacles rather short, apparently only partly 

 contractile, widely spaced. When the proboscis is completely 

 retracted, as in the specimen drawn, the head has somewhat the 

 aspect from above of a cow's head and horns. The siphon is 

 rather long. In the radula, the rachidian has four cusps, the 

 outer smaller and divergent. The lateral has a long, oblong- 

 base slightly sinuate posteriorly, with about fifteen cusps, the 

 inner directed towards the rachidian, the .second and third 

 largest, the rest gradually diminishing to minute exterior 

 denticles. 



Maculotriton australis Pease. 

 (Plate I, figs.28, 29, 30.) 



The local members of this genus were discussed antea, Vol 

 xxxix, p. 733. M. australis haunts the shaded sides of boulders 

 at low-water level on the ocean-beach. The animals creep about 

 with moderate activity; they are marbled with black and bufi' 

 The head is narrow, forking into divergent tentacles which 

 support eyes at half their length, above which point the tenta- 

 cles contract to half their former thickness. Siphon rather 

 short, only protruded for a length equal to three or four diameters. 

 Foot long and slender. Operculum (Fig. 29) with the nucleus 

 apical, situated about its own length from the tip of the tail. 



