634 SUPPLEMENT. 
CCELOCENTRUM (p. 267). 
Celocentrum filicosta (p. 272). 
Eucalodium (Ceelocentrum) filicosta, Pilsbry, Proc. Acad. Phil. 1891, p. 315°. 
To the locality given, add :— 
Hab. [E. Mrxico:] hills around Orizaba (He?/prin §). 
12. Celocentrum acanthophorea. 
Celocentrum acanthophorea, Dall, Nautilus, xi. p. 62 (1897) °. 
Pale yellow-brown, with 15 whorls remaining, suture with a sharp-edged thread on each side ; aperture — 
projecting ; small spines like the rays of a star projecting into the lumen of the last whorl. 
Long. 30, diam. 7, apert. 4°7 millim. 
flab. Centra Mexico: Encarnacion, State of Hidalgo (EZ. W. Nelson 1). 
13. Celocentrum nelsoni. 
Ceelocentrum nelsoni, Dall, Proc. U.S. Nat. Mus. xix. p. 352, t. 33. figg. 5, 6 (1896) '. 
Long. 53, diam. 18 millim. 
Hab. S.E. Mexico: Tuxtla (EZ. W. Nelson '). 
14. Celocentrum pfefferi. 
Calocenirum pfeffert, Dall, Proc. U.S. Nat. Mus. xix. p. 352, t. 33. figg. 1, 2 (1896) *. 
Shorter, stouter, and less cylindrical than C. turris. 
Long. 48, diam. 15 millim. 
Hab. 8.K. Muxico: Ocozocoautla (Otozucuantla) in Chiapas, 1200 metres (EZ. W. 
Nelson 1). 
HOLOSPIRA (p. 273). 
Dall [Proc. U.S. Nat. Mus. xviii. pp. 3-5 (1895), xix. pp. 346, 347: Nautilus, 
ix. p. 50 (1895)] subdivides this genus as follows :— 
Subgen. Horospira, s. str. Axis with a plait in the penultimate whorl, and with basal, parietal, 
and peripheral lamelle projecting into the lumen of that whorl: H. pulocerei, goldfussi, 
goniostoma. 
Sect. Bosrricnocentrum, Strebel and Pfeffer. Axis moderate, with a continuous plait extending 
nearly the whole length, but with no lamelle: H. tryvni, veracruziana, 0. 
Sect. Haprostemma, Dall. Axis moderate, with a short stout axial lamella in the penultimate 
whorl only: H. mearnsi, Dall, from New Mexico. 
Sect. Eupistemma, Dall. Penultimate whorl with a short axial and a parietal lamella only ; 
axis moderate: H. arizonensis. 
Sect. Disromosrrra, Dall. Penultimate whorl with a short Strong axial and a basal lamella ; 
axis moderate, smooth: H. bilamellata, Dall, from New Mexico. 
Subgen. Metastoma, Strebel and Pfeffer. Axis smooth, without plait or sinuosity ; penultimate 
whorl without lamellae: H. remeri, pfeifferi, remondi, coahuilensis, semisculpta. 
Subgen. Ca:tostemma, Dall. Axis vertically ribbed as in Calocentrum; shell otherwise as in 
Metastoma: H. elizabethe. 
