with Descriptions of .V. w Sj 



are then erroneous and altogether defective. The reserve 

 we have shown in this respect in our Journal was clearlj 



"In the Cylindrella} of the Antilles, on the other hand, the row 

 teeth are so oblique that they appear to have a quinenncial ana: 

 ment; each row composed of a small number of teeth of peculiar 

 palmated form; the rachidian tooth is of a very diffen til t . 

 tremely narrow and enlarged at one of it. extremitii s, W< 

 not been able to find the jaw in C. s an guinea Pfr. of Jamaica, wl 

 we have examined, and of which the dental formula i- (12-1 

 x 115. 



"Considering these important anatomical differences, we think it 

 consistent to separate from the genus Cylindrella, the group, •. 

 natural, moreover, with reference to zoological geography, ■ >:' I; 

 species from Central America (Mexico and Guatemala), of which C. 

 GMesbreghti is the type. We would at the Bame time obsei 

 with reference to conchological characters, that tie-.' Bpecies i 

 nearly the s-.uue fades, they have generally an obsolete, filii 

 carina on the last whorl, and almost all have a columellar fol 

 or less developed, situated deeply within the aperture, and continut d 

 the whole length of the axis around which it revoh i 



After some remarks on different forms of Cylindrella, i 

 Crosse and Fisclier propose the new genu- Eucalodium for the 

 group of which the following species are mentioned a- the pi 

 cipal representatives, viz.: C. Ghiesbreghti, decottata, M 

 cana, grandis, splendida, turris, clava, speciosa and B 



The genus is characterized a- follows: 



Genus Eucalodiim, Crosn and fflscher. Animal mas 

 ata, longitudinaliter tenuissime striata, parte marginw infl 

 dia obsolete prominula, margine supero radicem rotund 

 tente, instructum. Radula seriebus transversis, rectilim 

 merosis, uniformibua constituta, acie uncinorum ba 

 tarn vix superante; dens medinnus uncinis paulo I 

 pide. Animal caeterum ad familiam Helicidarum omnii 



Testa Bubrimata, turrita, cylindrelheformis (in adtihi 

 bus) late truncata : ultimas anfractus breviter solum 

 tus, plus minusve filo-carinatus : columella intua plernnnjuc in 

 cata, plica columnam internam ambiente, in 

 evanida. Typus: Cylindrella Ghiesbregl ff< r. 



* I have directed ti 

 clava the axis as described by mi 



