170 SALASIELLA. 



Length 32, diam. 9, aperture 16 mm. ; whorls 514. 



Length 30, diam. 8.5, aperture 15 mm. ; whorls 5*4. 



Length 28, diam. 9.5, aperture 14 mm. ; whorls 5. 



The shell is even slimmer and more obliquely coiled than 

 P. cornea, the last half -turn of the suture being very oblique 

 to the preceding one above it. A more important difference 

 is in the embryonic whorls, which are without the subsutural 

 cord of P. algira and P. cornea. The first whorl is smooth 

 and convex; fine striae then gradually begin, rapidly becom- 

 ing strong rib-striae on the last half -whorl of the embryo. As 

 in P. cornea, there are about 2% embryonic whorls. 



Genus SALASIELLA Strebel. 



Salasiella STREBEL, Beitrag zur Kenntniss der Fauna Mexi- 

 kanischer Land- und Susswasser-Conchylien, iii, 1878, pp. 6 

 (type S. joaquina), 20. v. MARTENS, Biologia Centrali Amer- 

 icana Mollusca, p. 81 (1891). Selasiella TRYON, Manual, i, p. 

 43. Selaniella Strebel, ANCEY, Annales de Malacol., ii, p. 245 

 (1886). 



The shell is small, oblong or fusiform, unicolorous, of glassy 

 or corneous appearance, smooth or feebly striated, without 

 spiral striae; embryonic whorls smooth; columella truncated 

 basally, as in Euglandina. 



The radula has the formula 10,2,1,2,10. There is a *di- 

 developed central tooth; the inner two laterals 'are Inige and 

 powerful, with broad basal-plates, the outer ones n 1 1 slender, 

 with narrow basal-plates of the usual sole-like shape (pi. 25, 

 fig. 7, 8. joaquince). Only one pouch-like stomach. Cerebral 

 ganglia concentrated into one group, Gmitalia (pi. 25, fig. 

 9, 8. joaquince) with a curved finger-shaped appendix (fig. 9, 

 gm) near the base of the penis (p). Labial processes per- 

 haps lacking. Type 8. joaquintr 



The species now known give this genus of minute Oleaci- 

 noid forms an extension from southern Guatemala to the state 

 of Nuevo Leon in northeastern Mexico. Two species were 

 described and figured in vol. I of this work. 



