CUBAN ANNTJLARiroAE TORRE AND BARTSCH 305 



inflated and strongly rounded marked by poorly expressed incre- 

 mental lines and spiral threads, which amount almost to narrow 

 keels; the first and second spiral threads at the summit are slightly 

 crenulated. Suture strongly constricted. Periphery well rounded. 

 Base short, well rounded, openly umbilicated, marked by lines of 

 growth and by spiral threads equaling those on the spire in strength. 

 On the umbilical wall the axial lines of growth become somewhat in- 

 tensified and the spiral threads become somewhat reduced. Aperture 

 broadly oval ; peristome double, the outer broadly, flaringly expanded 

 and reflected; the inner narrow, exserted, and slightly reflected. A 

 breathing pore is present on the parietal wall a little anterior to the 

 posterior angle and within the edge of the aperture. Operculum 

 typically eutudorid. 



This species is confined to Matanzas Province, where it breaks up 

 into two subspecies: 



KEY TO THE SUBSPECIES OF ANNULARIA (EUTUDORA) LIMBIFERA 



Umbilicus narrow ternata 



Umbilicus broad limbif era 



ANNULARIA (EUTUDORA) LIMBIFERA TERNATA (Reeve) 



Plate 33, Figure 5 



1844. Cydostoma interruptum Gould, Froc. Boston Soc. Nat. Hist., vol. 4, p. 494. 



Not C. interruptum Lamarck, 1822, Histoire naturelle des animaux sans 



vertebres, vol. 6, pt. 2, p. 145. 

 1863. Chondropoma ternatum Reeve, Conch ologia iconica, No. 65. 



Reeve figured a specimen which he had received from Gould; 

 Gould, in turn, received his material from Bartlett; and Bartlett 

 collected near Matanzas. Reeve's figure shows the large race which 

 we have in abundance from the region about the cave of Bellamar. 

 We are therefore applying Reeve's name to the large race. 



The specimen figured, U.S.N.M. No. 356399, comes from Bellamar 

 and has 5.3 whorls and measures: Length, 16.2 mm.; greater diam- 

 eter, 12.6 mm.; lesser diameter, 10.2 mm. 



Under the name of Cydostoma interruptum Sowerby, Gould says 

 of the animal (Proc. Boston Soc. Nat. Hist., vol. 4, p. 494, 1844): 

 "Animal light pea green, neck reddish, tentacles bright ferruginous, 

 nearly carmine. When in rapid motion 'instead of proceeding directly 

 ahead with the shell steady, it rests the shell on the ground until the 

 body is extended as far as the shell will permit without dragging, and 

 then by a sudden jerk, throws the shell forward, and so on alternately, 

 much more rapidly than one would suppose possible. First one side 

 of the animal moves, then the other, like an elephant.' " 



