CUBAX SUBFAMILY CHOXDROPOMIXAE TORRE AND BARTSCH 387 



is openly iimbilicated. The outside of the umbilical wall is marked 

 by the continuation of the axial riblets and spiral threads. Aper- 

 ture moderately large, ovate; peristome double, the outer very 

 broadly, flaringly expanded, not quite in one plane but somewhat 

 wavy, of about the same width all around except at the parietal wall 

 where it is much narrower and where it is appressed and adnate to 

 the preceding turn. The expanded outer peristome is composed of 

 a series of concentric lamellae. The inner peristome is a little 

 thicker, moderately elevated, slightly expanded and reflected. Oper- 

 culum thin, corneous, paucispiral, with the nucleus almost submar- 

 ginal, the outside covered with a deposit of fine calcareous granules, 

 which are j^laced in a more or less wavy pattern. 



Of the animal of C. {€.) irradians palenquense Bartsch took the 

 following field notes at El Palenque, July 21, 1928, Station 19 : 



"Animal short, with numerous small elongate spots of brown on 

 the forehead, which give to the back a somewhat brownish appear- 

 ance. Base of tentacles with a whitish buffy ring bordered on the 

 sides by a streak of the same color. Tentacles ashy gray, muzzle 

 light ashy buff. Sides of the body huffish gray. Sides of foot ashy; 

 sole of foot ashy with a faint yellowish tinge, deeply medially cleft. 

 Motion of the two sides alternate.'' 



In this species the animal readily comes out of the shell if it 

 is allowed to remain quiet for a little while. In this respect it 

 differs radically from C. (C.) pj^esasianuTn, which refuses to come 

 forth readily. 



This species ranges from Loma Quintinal through Vista Alegre, 

 through Abra Figueroa, through Pan de Matanzas, through El 

 Palenque, and through the Sierra Camarones to Vieja Beremeja. 



We are recognizing six subspecies. 



Distribution of the subspecies of C. (C.) irradians is shown in 

 figure 101. 



KEY TO THE SUBSPECIES OF CHONDROPOMA (CHONDROPOMARTES) IRRADIANS 



Ground color pale brown. 



Shell large panense 



Shell not large. 



Shell brilliantly banded figuroense 



Shell not brilliantly banded irradians 



Ground color not pale brown. 

 Ground color flesh-color. 



Decollated shell more than 17 mm palenquense 



Decollated shell less than 15 mm camaronenss 



Ground color not flesh-color, but white candicans 



