Page 
XXVili 
INTRODUCTION. 
Costa Rica and Panama the greater geographical extension belongs to the Pacific 
slope. 
One peculiarity of the fauna of the Western slope is worthy of note, 
viz., the occurrence of peculiar large-sized forms of Otostomus or Bulimulus in the 
western part of Mexico, such as O. dombeyanus, O. fenestratus, and O. chaperi, 
related somewhat to the Andean 0. millegranus and O. altoperuvianus; it is among 
the land-shells somewhat analogous to the phyto-geographical distribution of the 
majority of the Cactaceee. 
The submarine Mollusca of the eastern and western shores are of course distinct, 
more so even than some truly marine shells, as Tellina rufescens and Purpura patula, 
but there are remarkably analogous forms among them. 
oo 
bho © 
> orbon or 
eo 
bo Oo Se 
May 1901. 
EK. v. M. 
ERRATA ET 
for 1843 read 1883. 
for H. florida read H. flavida. 
for 1779 read 1799. 
for cinctelta read cinctella. 
for Plumas read Palmas. 
for above Jalapa read below Jalapa. 
for G. read S. 
for G. read S. 
erase the letters mm. at the head of the Anfr. 
column in the Tables. 
for Centrat read West. 
for Hége read H. H. Smith. 
for fig. 14 read fig. 12 b. 
add at end of line (Tab. IX. figg. 6, 6a.) 
for figg. 2, 2a-7, 7a. read 2-2a-5, 5a, 7,7 a. 
for tridonia read tridonta. 
add after albidus. (Tab. XIV. fig. 15.) 
for Bulimula read Bulimulus. 
add after apiostoma, (Tab. XVII. fig. 4.) 
add after pulchella. (Tab. XVII. figg. 3, 3a.) 
add after salpinw. (Tab. XVII. fig. 5.) . 
for Turubanes read Turubares. 
CORRIGENDA. 
Page Line 
333 12 for concordlalis read concordialis. 
336 3 for moerchi read mérchi. 
342 1 for Astonrp& read ARIONIDE. 
348 12 for Strebel read P. Strobel. 
360 34 for figg. 5, 5a, b. read figg. 5, 5a, 6. 
394 10 for N. read EK. 
400 8 for Planorbulina read Planorbula. 
402 18 for p. 3 read p. 321. 
444 9 for t. 10 read t. 14. 
451 34 for Mechychilus read Pachychilus. 
471 1 for Bean read Beau. 
472 27 add after reclivata. (Tab. XXVIII. fig. 2.) 
498 19 for figg. 6, 6 a-c. read 6, 6a, b. 
012 18 jor p. 103 read p. 105. 
528 at head of fifth column in lower Table for 
Guatemela read Guatemala. 
538 29 for latemarginata read latomarginata. 
552 8 for figg. 2a, 6, c. read figg. 2, 2 a, b. 
556 35 for Conovalus read Conovulus. 
583 4. for ziczak read ziczac. 
588 23 add after virginea. (Tab. XXVIIL. figg. 11, 12.) 
599 after line 9 add CHONDROPOMA (p. 16). 
600 10 for cordovanm read cordovanum. 
