143 



The beautiful spouted-tubed P. solans, known to Linnseus, but still of 

 great rarity in fine condition, is from Malacca. 



Species. 



1 . calculifems, i2eev^. 4. exutus, J?ee?j<?. 7. pallidulus, fe^w. 



2. cereiis, id. 5. Indicus (TrocIius),W. 8. Solaris (Trochus), Linn. 



3. corrugatus, id. 6. onustus. Reeve. 9. SolarioideSj Reeve. 



Figure. 



Phouus onustus. pi. 14. Fig. 71. Shell, showing the aperture, with 

 three valves of Cardium, one of Tedmncuhis, one of Area, and a piece 

 of coral agglutinated to the periphery of the last whorl, which in each 

 instance is moulded to receive them. 



Genus 14. SOLARIUM, Lamarck. 



Animal ; disk small, oval, elevated on a short pedicle, and fur- 

 nished at its hinder extremity with a small horny spiral 

 operculum, head flattened, and prolonged into tioo tentacles, 

 at the base of each of which is a short pedicle, supporting 

 the eyes ; the mantle is reflected into a collar around the 

 aperture. 



Shell ; circular, depressely conoid, consisting of a number of 

 whorls closely convoluted together, but in such an annular 

 arrangement as to form a wide perspective umbilicus, outer 

 edge of the lohorls sharjjly angled, imparting a trapezlform 

 shape to the aperture, of lohich the lip is simple and acute. 



The Stair-case Trochus, another shell equally well known to collectors 

 with the last, also constitutes the type of a genus lo which several in- 

 teresting species may be referred, and the importance of which has been 

 confirmed by observations on the animal made by MM. Quoy and Gaimard, 

 the eminent naturalists of the Voyage de 1' Astrolabe. Elevated on a 

 short pedicle, like the TarLines and Trochi, and bearing a modified resem- 

 blance to those genera in the reflected collar of the mantle, the head is not 

 shaped like a proboscis, but prolonged, somewhat after the manner of 

 Buccinum and Purpura, into two elongated tentacles. 



