4 Notes on certain Terrestrial Mollusca^ 



Ghieshreghti is the type. We would at the same time observe, 

 with reference to conchological characters, that these species have 

 nearly the same facies^ they have generally an obsolete, filiform 

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

 or less developed, situated deeply within the aperture, and continued 

 the whole length of the axis around which it revolves." 



After some remarks on different forms of Cyliiidrella^ etc., 

 Crosse and Fischer propose the new genus Eacalodmm. for the 

 group of which the following species are mentioned as the prin- 

 cipal representatives, viz. : C. Ghieshreghti^ decollata^ Mexi- 

 cana, grandis^ sjplendida^ turris^ clava, sj)eclosa and Boucardi, 



The genus is characterized as follows : 



Genus Eucalodium, Crosse and Fischer. Animal maxilla arcu- 

 ata, longitudinaliter tenuissime striata, parte marghiis inferi me- 

 dia obsolete prominula, margine supero radicem rotundatam emit- 

 tente, instructum. Radula seriebus transversis, rectilinearibus, nu- 

 merosis, uniformibus constituta, acie uncinoruni basin subquadra- 

 tani vix superante ; dens medianus uncinis paulo minor, acie tricus- 

 pide. Animal Cii3terum ad familiam Ilelicidarum omnino referendum. 



Testa subriniata, turrita, cylindrella'formis (in adultis specimini- 

 bus) late truncata : ultimus anfractus breviter solutus, dorso angula- 

 tus, plus minusve filo-carinatus : columella intus plerumque unipli- 

 cata, plica colunmam internam ambicnte,* in vicinio aperture 



evanida. Typus : Cylindrella Ghieshreghti PfeifFer. 



• 



In February, 18G7, a number of shells were collected by- 

 Mr. W. M. Gabb, in Lower California, and among them two 

 species described by him as Cylindrella Neiccomhiana and C- 

 irregularis.^ and figured in the American Journal of Conchology, 

 iii. 237-238, pi. 16, figs. 3-4. 



Several months ago, Dr. ]S[ewcomb sent to me a specimen of 

 the former species ; from its general aspect I doubted its being 

 a Cylindrella, and suggested to him that the presence or absence 



* I have directed tlie attention of M. Crosse to the fact that in C. turris and G. 

 clava the axis as described by nie (Ann. Lye. viii. 160) is a highly polished tube, 

 the exterior of which is distantly but strongly ribbed, diminishing in diameter 

 towards and terminating at the base in a point, the umbilicus being imperforate. I 

 have since noticed the same structure in G. fiikoda Shuttl. 



