30 CALIFORNIA SEA-SIIELLS. 



that it often escapes the collector, but when found 

 and examined by a glass, it shows its beauties. 

 Its color is white, with large zigzag stripes of 

 bright, cherry red. 



Pachypoma gibberosum,, Chem., Fig. 2, PI. 

 VII, is a strong, brick-red shell, often found 

 dead, and commonly somewhat broken. It is 

 broadly conical, its whorls roughened with nu- 

 merous coarse, short ribs, and its base marked by 

 five or six deep, concentric furrows. The op( r- 

 culum is oval, horny within, with a white shelly 

 bulge on the outside. Breadth of shell, from two 

 to three inches. 



Fig. 4, PI. VII, represents the large wavy 

 Top-shell, Pomardax undosus, Wood. It some- 

 times grows to a size much greater than the fig- 

 ure, and the large animal may be seen stretched 

 out upon the rocks, feeding. When perfect, the 

 whitish pearl shell is covered with a brown, fi- 

 brous epidermis. In form, it is flatly conical, 

 with a long, triangular aperture ; the outer lip is 

 thin, the whorls covered with undulating ribs, 

 and the base ornamented with beaded circles. 

 The operculum is very striking, horny within, 

 and strengthened without, by two strong, curved, 

 shelly ribs, as shown in the figure. This species 

 abounds at Santa Barbara, and southward, 

 though it has been found at Monterey. 



In Fig. 5, PI. VII, we can not fail to see a 

 model of the old friend who is so ready to greet 

 us as we step our feet on the rocky shore. 

 " Thousands of thousands " would hardly give us 

 a correct idea of the numbers of this Black 

 Turban, or Chlorostoma funebrale, A. Ad. 



