1905.] NATURAL SCIENCES OF PHILADELPHIA. 241 



lata, but the whorls arc not flattened above as in that species, and are 

 not punctate. 



With a single exception mentioned below, no angigyra have been 

 found on the south side of the range. On the north side it occurs in 

 Brown's Canyon (figs. 50, 54), varying much in size and degree of angu- 

 lation, the smaller specimens being like the type lot, the larger ones 

 less angular and approaching levettei. Five measure : 

 Alt. 7.3, diam. 14. S mm. 



" 7, " 14.8 " 



" 6.7, " 14.5 " 



" 7, " 13.8 " 



At Ramsey Canyon, two miles east of Brown's Canyon, similar forms 

 were foimd at about 6,000 feet elevation. • 



On the opposite side of the range, at the base of Bear Canyon, in the 

 foothills, at about 5,000 feet, Mr. Ferriss collected a few small speci- 

 mens which do not seem to differ much from typical angigyra. Two 

 before me measure 5x11 and 4.8 x 10 mm., with only 5| whorls (figs. 

 51, 52, 53). 



The genital system (PI. XXI, fig. 28) is somewhat peculiar. The 

 penis is quite long, but the vagina is unusually short. This is unlike 

 A. angidata of the Chiricahuas, some forms of which imitate angigyra 

 in the form of the shell. 



The jaw (PI. XXIII, fig. 14) has 8 very unequal ribs. 



The radula (PI. XXII, fig. 12) has 19.10.1.10.19 teeth. The ecto- 

 cones of central and inner lateral teeth are very short. The mesocone 

 is bifid from about the 15th tooth out, but the ectocone only on the 

 outer marginals. This approximates to the condition found in A. 

 chiricahuana. There are more teeth and more laterals than in A. angu- 

 lata. 



Ashmunella levettei heterodonta u- v. PI. XV, figs. 80-9L 



In Cave Creek Canyon and the tributary Ida Canyon on the southern 

 slope of the east end of the Huachuca range, Mr. Ferriss found an extra- 

 ordinary series of Ashm\mellas, in which the teeth vary from about as 

 well developed as in A. levettei to completely obsolete as in A. chirica- 

 huana. No other member of the genus was found in these canyons. 

 The several stages occur together,^ and the chain of mutations is unin- 

 terrupted. 



*See also Mr. Ferriss' notes on this race, Nautilus, XVIII, p. 51, below mid- 

 dle of page. 



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