246 PROCEEDINGS OF THE NATIONAL MUSEU]M vol. 85 



KEY TO THE SUBSPECIES OF TURRITHYRA (TURRITHYRA) CANALICULATA 



Shell with conspicuous axial brown streaks pinalillensis 



Shell without conspicuous axial brown streaks. 

 Interrupted spiral brown bauds conspicuous. 



Axial riblets rather strong andreas 



Axial riblets feeble saguaensis 



Interrupted spiral brown bands inconspicuous canaliculata 



Figure 84. — Distribution of the subspecies of Turrithyra (Turrithyra) canaliculata: (1) 

 pinalillensis; (2) saguaensis; (3) canaliculata; (4) andreas. 



TURRITHYRA (TURRITHYRA) CANALICULATA PINALILLENSIS, new subspecies 

 Plate 14, Figure 1 



This race is marked by brown varicial streaks, usually separated by 

 bands of a little wider, of the orange-red base color. It also has 

 inconspicuous brown spiral threads. The outer peristome is tinged 

 with orange-red. It comes from Hato Pinalillo. 



The type, U.S.N.M. no. 104500, has 5.3 whorls remaining and 

 measures : Length, 23.5 mm ; greater diameter, 12.8 mm ; lesser diam- 

 eter, 9.1 mm. 



The dark varicial brown zones readily distinguish this subspecies 

 from the other two. 



TURRITHYRA (TURRITHYRA) CANALICULATA ANDREAS, new subspecies 



Plate 14, Figl^re 3 



This subspecies, which was collected by Dr. de la Torre at Pico 

 Grande, Sierra San Andres, has the rather strong axial riblets char- 

 acteristic of T. (T.) canaliculata pinalillemis and interrupted spiral 

 bands of brown narrower and not so strong as those of T. (T.) canali- 

 culata saguaensis. 



