164 POIRETIA. 



spicuously from the several small common Streptostylae of the 

 same locality in proportions as well as by its perforate axis. 



Genus POIRETIA Fischer. 



Poiretia FISCHER, Manuel de Conchyliologie, p. 452, for 

 Glandina algira (Feb. 21, 1883). Glandina, Achatina, etc., 

 auct. 



For anatomy, see RAYMOND, Journ. de Conchyl., iv, 1853, 

 pp. 14-29, pi. 1, f. 5. CROSSE et FISCHER, Journ. de Conch., 

 1868, p. 234; Miss. Sci. Mex., Moll., p. 73, pi. 4, f. 10 (teeth 

 of G. algira}. SIMROTH, Nachtschnecken der portugiesisch- 

 azorisehen Fauna, etc., Nova Acta Acad. Caes. Leop. -Carol. 

 Germ. Nat. Cur., vol. 56, 1891, p. 251, pi. 6, f. 16 (genitalia, 

 muscles, etc., of G. algira). 



The shell is oblong or fusiform, rather finely rib-striate, 

 with the appearance and columella of Euglandina. Embry- 

 onic shell of about 2 l / 2 whorls, the last y 2 to 1% of which 

 are striate, the earlier whorl or half whorl smooth. The lip 

 processes are short and blunt, about half as long as the lower 

 tentacles, the exterior otherwise as in Euglandina. 



Radula with about 20,1,20 teeth, the central small but 

 well developed, having a distinct cusp ; lateral teeth as in 

 Euglandina. 



Genitalia (pi. 25, fig. 5) with a short penis, terminating in 

 a transversely placed blind sack. The long retractor is 

 terminal, and is attached distally to the lung floor. The 

 spermatheca is small, on a long duct, which enters high on 

 the long vagina. 



The retractor muscles have been figured by Simroth (pi. 25, 

 fig. 10) . The true columellar muscle is represented by a wide 

 band acting as a tail retractor; laterally this gives off two 

 long muscles which split distally, are inserted in the sole, and 

 act as retractors of the foot in front. The right ocular and 

 tentacular band crosses the penis, and seems to be joined 

 proximally to the columellar muscle; the left unites near its 

 base with the pharyngeal retractor. 



The cerebral ganglia are pear-shaped, united by a short 

 commissure ; pedal ganglia concentrated. 



