AURICULA. Panama Shells. 211 



Habitat. Guayaquil ; M. Fontaine ! Orbigny. 

 West Columbia ; Cuming ! Kiister. 

 I. of Tumaca; Gaining! in sched. 

 Panama ; C. B. A. ! 



At the base of the sea wall of the city we collected 36 speci- 

 mens in various stages of growth. They are rather more robust 

 than the species is represented in the figures above cited. 



314. Auricula Tabogensis. Nov. sp. 



Shell obovate : very dark brownish red, more or less rufous 

 on the columella, usually white on the plaits and callus within : 

 smooth and shining, with some fine spiral stria? on the upper 

 whorls : apex acute : spire with the outlines very curvilinear : 

 whorls ten, imbricately appressed, with a distinct suture : last 

 whorl large : aperture long and narrow, in the right side mostly 

 covered by a transversely ridged callus : with three plaits on the 

 left side, of which the upper one is a little larger, and the two 

 lower are separated by a sinus. 



Mean divergence about 100 ; length .59 inch ; breadth .36 

 inch ; length of spire .15 inch. 



Two specimens of A. fusca Phil., which we have received 

 from M. Petit, are more angular in the upper part of the whorls, 

 and have the callus within the labrum more finely and closely 

 ridged. A. fusca, as figured by Kiister, more robust and less 

 pyriform than our shell. According to M. Petit's label, A. fusca 

 occurs at the Marquesas, and Kiister mentions the Sandwich 

 Islands as its habitat. In outline our shell resembles A. pyri- 

 formis Petit (West Columbia, Cuming !), but within the aperture 

 there is no resemblance. 



Station. On and under stones and rocks at high water mark. 



Habitat. Taboga and Panama; C. B. A. ! 

 800 specimens were collected. 



