CUBAN ANNULlAKIIDAE — TORRE AND BARTSCH 239 



the inner being only slightly expanded. It is most nearly related to 

 P. (P.) chordata songoensis, with which it shares the rather distant 

 spacing of the axial riblets, but from which it is differentiated by its 

 much weaker basal spiral cords 



The type, U.S.N.M. No. 493357, a complete specimen, has 7.5 

 whorls and measures: Length, 12.6 mm.; greater diameter, 5.4 mm.; 

 lesser diameter, 4.8 mm. 



PARACHONDRIA (PARACHONDROPS) CHORDATA CHORDATA ([Gundlach] Pfeiffer) 



Plate 21, Figure 1 



1858. Cyclostoma chordalum [Gundlach] Pfeiffer, Malakozool. Blatter, vol. 



5, p. 189. 

 1861. Adamsiella chor datum Bland, Ann. Lyceum Nat. Hist. New York, vol. 7, 



p. 353 (27). 

 1920. Chondropoma (Chondropomorus) chordalum Henderson and Bartsch, 



Proc. U. S. Nat. Mus., vol. 58, p. 61. 



The typical race comes from Enramadas, in the region of Santiago, 

 Oriente. It also belongs to the group that has the inner peristome 

 only slightly expanded and reflected. It differs from all the other 

 members of that group in having both the axial and spiral sculpture 

 quite feebly expressed. 



The specimen figured, U.S.N.M. No. 493354, a cotype received from 

 Gundlach, has 4.5 whorls remaining, and measures: Length, 10.1 mm.; 

 greater diameter, 5.4 mm. ; lesser diameter, 4.3 mm. 



PARACHONDRIA (PARACHONDROPS) NIGRICULA (Gundlach) 



Plate 21, Figure 7 



1860. Cyclostoma nigriculum (Ctenopoma) Gundlach, Malakozool. Blatter, vol. 



7, p. 28. 



1861. Ctenopoma nigriculum Bland, Ann. Lyceum Nat. Hist. New York, vol. 7, 



p. 27. 

 1920. Parachondria (Parachondrops) nigricula Henderson and Bartsch, Proc. 

 U. S. Nat. Mus., vol. 58, p. 67. 



Shell elongate-conic, pale yellow, with the inner peristome white. 

 Nuclear whorls decollated in all our specimens. Postnuclear whorls 

 slightly inflated, well rounded, marked with retractively slanting, 

 slender axial ribs, of which 40 occur upon the first of the remaining 

 turns, 72 upon the second, 90 upon the third, 126 upon the fourth, and 

 144 upon the last. These ribs are not all of the same strength, but a 

 series of taller ones alternate with more slender elements, the taller 

 ones forming expanded tubercles at the summit, which here give to 

 these groups a somewhat tufted appearance. The spiral sculpture 

 consists of obsolete cords, which render the riblets slightly wavy. 

 Suture strongly constricted. Periphery inflated, strongly rounded. 

 Base short, inflated, strongly rounded, narrowly, openly umbilicated, 

 marked by the continuation of the axial ribs and by a strong spiral 



