448 A MANUAL Ot' AMERICAN' LAND SHELLS. 



by the common duct of a highly developed, multifid vesicle. This lat- 

 ter organ consists of twenty-five long, narrow, cylindrical, blind tubes, 

 contorted at their termination, and opening separately into a common 

 tube, containing, in the specimen examined, attached to its bottom, a 

 narrow, cylindroid organ, which probably may have been an uncalci- 

 fied dart. The tube formed by the prepuce and the duct of the multifid 

 vesicle, as previously mentioned, opens exteriorly immediately beneath 

 the mouth. The ovary is small and unusually lobulated. The oviduct 

 is a narrow, cylindrical tube, which winds forwards and then back again, 

 so as to form a double spiral, after which it makes a curve downwards, 

 and is joined by the duct of the generative bladder. The latter organ 

 is globular; its duct is short, gradually increases in breadth, and is spir- 

 ally twisted. From the duct, as previously mentioned, passes a small 

 ofiset to the vas deferens. The common duct of the bladder and ovi- 

 duct, or vagina, is cylindrical, and just before terminating is joined by 

 a short, wide tube, derived from a large, oval sac, which is filled witli a 

 delicate, reticulated substance. This sac is peculiar to Yeronieella ; its 

 use is problematical. The position of the female orifice of generation 

 has been already stated. 



SrURIOUS SPECIES OF VERONICELLA. • 



The followiug species are catalogued by Grateloup among the American FaghiuH 

 (Dist. Geog. des Limaciens, 22). They were all described by Rafinesqiie, and by him 

 placed iu his genus Philomycus (see Binuey and Tryou, reprint). From the general 

 inaccuracy of that author, as well as the deficiency of the descriptions, I think they 

 should be excluded from this or any genus. 



Vaginuliis flexuolaris. Vaginuhts oxynrus. 



Vaginulus fuseus. Vaginuhts quadrilns. 



g. Locally Introduced Species. 

 Family LIMACID^. 



ZOIVITES. (Seep. 201.) 

 Zoiiltes cellariiis, Mulleu. 



Shell very much depressed, thin, fragile, pellucid; epidermis light- 

 FiG. 493. greenish horn-color, smooth, highly jiolished; whorls 5, slightly 

 ^^^^ rounded, with minute and almost imperceptible oblique striae; 

 . aperture not dilated, its transverse diameter the greatest; um- 

 bilicus moderate, regularly rounded, deep ; base rounded, 

 thickened within by a testaceous deposit, bluish-white; peri- 

 z.ceiiaHiis. gtomc Simple, acute. Greater diameter 13, lesser 11^"'"'; 

 height, S-""". 



