36 THE NAUTILUS. 



C. stercoraria L. (a) I have two dwarf specimens of the type 

 measuring 33.5 and 35 mm. (b) Mottled with patches of a 

 paler colour, the whole having a gangrenous appearance, 

 caused by a disease of the mantle. 



C. stercoraria L. var. gibba Gmel. More conical than the type 

 and having the sides heavily flounced as in C, arabica, var. 

 rcticulata. 



C. arabicvla Lamarck. A fine example with the outer lip 

 much extended beyond the posterior extremity. 



C. algoensis Gray. A very pinched-up humped shell, quite 

 an abnormality. 



C. umbilicata Sow. A fine example in Mr. Richard's collec- 

 tion, 103 mm. long, with the outer lip extended into a curious 

 flange on the anterior extremity. 



C. pantherina Sol. (a) The outer lip so extended that the 

 animal has contracted it into the shape of a letter V at the 

 posterior extremity, (b) Having a proboscis-like protuberance 

 projecting a quarter of an inch from the posterior end of the 

 dorsal surface at an angle of forty-five degrees, probably caused 

 by a barnacle, (c) Variety theriaca Melv. Having a large 

 whitish callosity on the posterior end of the dorsal surface giving 

 the shell a very remarkable appearance, (d) The base mark- 

 edly convex, giving the shell a rocking-horse-like motion when 

 the ends are pressed against a smooth surface, (e) The dorsal 

 surface strongly corroded by a disease of mantle. Red Sea and 

 Philippines. Some specimens of C. tigris collected by Mr. 

 Stanley Gardiner in the Seychelle Islands are similarly attacked. 



C. exanthema L. Abnormally flattened on dorsal surface. 

 (Miss Foster). 



C. onyx L. var. adusta Chemn. A specimen in the Manchester 

 Museum has a barnacle attached, partly enameled over and 

 colored like the rest of the shell. 



Dautzenberg in his paper " Sur quelques deformations chez 

 des Cypra?a de la Nouvelle-Caledonie" in the Journal de 

 Conchyliologie, vol. liv, has enumerated the following varie- 

 ties, many of which are subject to melanism : 



neglecta, L., var. marteli, Dautz. 



stolida, L., var. crossei, Marie. 



mappa, L., var. montrouzieri. Dautz. 



vitellus, L. var. subrostrata, Dautz. 



errones, L. , var. compressa, Dautz. 



aselht-s, L., var. bougei, Dautz. 31 mm. long ! 



clandestina, L. , var. marteli, Dautz. 



punctata, L., var. rostrata, Dautz. 



cribraria, L., var. rostrata, Dautz. 



erosa, L., var. protracta, Dautz. 



