Zoological Society. 131 



Hab. Island of Cagayan, province of Misamis, island of Mindanao, 

 Philippines (found on the beach) ; Cuming. 



Mr. Sowerby referred this extraordinary shell with some doubt to 

 the Murex acanthropterus \ its proportions are however so utterly 

 different that I have no hesitation in describing it as a new species. 



Murex ambiguus. Mur. testa glohosd, suhpyriformi, transversim 

 liratd, liris irregularihus erectis, interruptis ; octofariam varicosd, 

 varicihus frondosis, frondihus alternis vel paucioribus elato-ramo- 

 sis, spinosis, hasalibus longioribus ; albd, frondibus lirisque aterri- 

 mis, labri columellari parte superiori nigro tinctd ; canali brevi- 

 usculo. 



Hab. } 



Three species appear to have been confounded hitherto under the 

 common title of Murex radix, which, though closely approximating, 

 may be separated without difficulty with a little careful discrimina- 

 tion. The true Murex radix is a round, particularly solid, heavy 

 shell, with a short though sharply acuminated spire with never less 

 than ten varices, in which the fronds are numerous, somewhat late- 

 rally compressed, comparatively short and sharp-pointed. The spe- 

 cies described by Dr. Philippi under the title of Murex nigritus has 

 but eight or nine varices, and the fronds are not branched ; those on 

 the upper angle of the whorl being tubercularly squamate, those in 

 the middle flat and very obscure, whilst those at the base are long 

 and horn-shaped. In the species under consideration the shell is of 

 somewhat light structure, and the fronds are large, open and flowery. 



Murex triformis. Mur. testd trigono-ovatd, crassiusculd, trans- 

 versim liratd et corrugatd, tuberculis duobus aut pluribus inter 

 varices ; trifariam varicosd, varicibus laminato-fimbriatis, supern^ 

 excavato-sinuatis ; ferrugineo-fuscd ; aperturd ovatd, superne si- 

 nuatd. 

 Hab. New Holland. 



This shell, which Mr. Sowerby thought to be a variety of the 

 Murex acanthropterus, is of a rude solid structure and dark rusty 

 brown colour. 



Murex pellucidus. Mur. testd trigono-fusiformi, tenui, trans- 

 versim liratd, pulcherrim^ squamatd, inter varices tuberculatd ; 

 trivaricosd, varicibus obliquis, latissime et eximie alatis ; pellucido- 

 albd ; aperturd parvd, labro intus nodosa. 

 Hab. Island of Bantayan, Philippines (found upon a coral bottom 

 at the depth of seven fathoms) ; Cuming. 



Mr. Sowerby has rather incautiously referred this shell to the Mu- 

 rex trigonularis of Lamarck, which Mr. Gray considers to be merely 

 a worn specimen of the Murex acanthropterus, and M. Kiener one 

 of the Murex phyllopterus. The shell under consideration differs 

 essentially from both of these, and the characters which it presents 

 are not at all in accordance with Lamarck's description of Murex 

 trigonularis. 



Murex osseus. Mur. testd oblongo-ovatd, subfusiformi, Icevius- 



