YIVIPARA. 



21 



Fig. 35. 



Viviparse, and when seen from behind, appears remarkably bulg- 

 ing at its upper portion. The umbilicus is not 

 always closed. Fig. 32 is copied from one of 

 Mr. Say's figures. No. 9301 of the collection is 

 figured in Fig. 36, 



In the description of the animal Mr. Say 

 speaks of a tubular cylindrical organ as a re- 

 spiratory syphon, but Haldeman suggests its 

 being probably the outlet of the viscous glands. 



A specimen in Mr. Anthony's cabinet mea- 

 sures in extreme length 33, last whirl 19, penul- 

 timate 8, antepenultimate 2^ mill., the measure- 

 ments being taken on the front of the shell. 



I have traced this species from Texas through Louisiana and 

 Mississippi to Key West, Florida, and in the 

 Westei'n States of Indiana, Wisconsin, and Mis- 

 souri. 



A more elongated, slender form of the species, 

 which is common in the southwest, from Mis- 

 sissippi to Texas, has been described by Mi'. 

 Tryon as a distinct species under the name of 

 V. texana. A careful examination of the speci- 

 men from which his diagnosis is drawn, as well 

 as the large series in the Smithsonian collection, 

 leaves no doubt in my mind of its identity. The 

 original description and figure are given below. 

 Reeve figures a much less characterized specimen of V. suhpurpu- 

 rea as Pal. texana, which he considers distinct. 



Vivipara svhpur- 

 purea. 



Fig. 36. 



Vivipara 

 cubpurpttrea. 



Fig. 37 



Vivipara texana. — Shell solid, conic, light green colored ; spire elongate, 

 suture deeply impressed, apex obtuse ; whirls 6, slightly- 

 convex ; aperture small, suborbicular, equalling two-fifths 

 the shell's length. 



Texas. Coll. Acad. Nat. Sciences ; Coll. G. W. Tryon, Jr. 



Shell solid, narrowly conic, consisting of six whirls, 

 which are somewhat flattened around the upper half of 

 their breadth ; suture well marked ; aperture suborbicu- 

 lar, equalling two-fifths of the length of the shell ; 

 umbilicus covered ; epidermis light green with faint red 

 revolving bands. 



This shell resembles most the V. suhpurpurea, Say, but Vivipara texana. 



