WEST AMERICAN HALIOTIS BARTSCH 53 



developed, median tumid ridge. The dextral and parietal walls of 

 the aperture are broadly expanded, sloping slightly inward, but not 

 excavated. Interior iridescent with pearly gray tint prevailing. 

 Muscle scar large, rugose-granulose. 



The type, deposited at Amherst College, yields the following 

 measurements : Greater length, 215 mm. ; greater diameter, 167 mm. ; 

 height, 80 mm. ; weight, 9G5 grams. 



The shell appears nearest related to HaUotis mfescem^ from w^hich 

 the ponderous shell, well-elevated spire, and pale interior {U. nif- 

 escem has the lively iridescent-green color scheme) readily differen- 

 tiate it. 



It is to be regretted that Professor Adams was unable to give any 

 information about the habitat of this abalone. I believe that it 

 should be looked for in southern California on extremely exposed 

 and surf -beaten ledges. 



HALIOTIS FULGENS Philippi 



1845. HaUotis fiilgens Philippi, Zeitscbr. fiir Malak., vol. 2, p. 150. 

 184G. HaUotis splendens Reeve, Conchologiji icouiea, fig. 9. 



1846. HaUotis planiUrata Reeve, Conchologia iconica, fig. 62. 



This species possesses remarkably uniform characters. We have 

 it in the United States National Museum collection from San Diego 

 to Cape San Lucas, from Catalina, Santa Rosa, Guadalupe, San 

 Bonita, and Cerros Islands, and a young specimen from La Paz, 

 within the Gulf. 



HALIOTIS AULAEA, new species 



Plate 8, Figures 1-3 



Shell of medium size and rather low, spire slightly elevated. The 

 color scheme of the exterior is a mixture of green and red, more or 

 less disposed in interrupted spiral zones, producing a tapestry-like 

 effect. Interior pearl-gray, edge of peristome variegated chiefly with 

 green. The exterior is marked by numerous flattened spiral cords, 

 which vary materially in size, usually finer ones separating the broad 

 elements. In addition there are obliquely protractively, radiating 

 nodulose ridges, the nodules being depressed. The surface likewise 

 has numerous incremental threads, which render the finer cords 

 minutely nodulose and the rest Urate. The siphonal angle bears 

 numerous craterlike projections, the last six of which are open. 

 Anterior to the siphonal angle there is a rather strong spiral cord 

 midway between this ridge and the basal edge of the shell. This part 

 of the shell is also marked by spiral cords, a little finer than those on 

 the spire, and by the continuation of the incremental elements. The 

 aperture is broadly oval, the outer edge of the peristome is acute, 



