282 NEOBELISCUS. 



long as the basal plate, side cusps short and blunt. Marginal 

 teeth with longer and blunt cutting points on the median, 

 and more acute cutting points on the side cusps. 



Salivary glands united above. Crop moderately swollen, 

 stomach small, globose. 



Relationships. By its simplicity the penis differs from 

 that of the Achatinince, but its musculature is like that of 

 Atopococklis, Achatina, etc., the penial retractor being a 

 branch of the right ocular band. The very large uterine 

 young remind one of Archachatina. The absense of a cusp 

 on the central tooth is an acceleration of the usual type in 

 the family. In a uterine young individual the cusp of the 

 central tooth was found to be developed, though small (pi. 

 45, fig. 2). 



The myology offers some interesting characters. As in 

 Rumina (figured in vol. xvii, pi. 65, fig. 45), the retractor of 

 the pharynx (ph. r.) is short and branches from the left re- 

 tractor band far forward. Unlike Rumina, it bifurcates. 

 All three retractor bands are free to the proximal root, where 

 they are very shortly though firmly united. This is unlike 

 Rumina, in which the right retractor and the columellar 

 muscle are united for a distance nearly as great as the free 

 length of the latter. 



Fig. 1. Neobeliscus calcareus (Born). Teeth of an adult 

 individual, m., median tooth; the side teeth are numbered. 

 Fig. 2. Teeth of a uterine young individual (fig. 6). Fig. 4. 

 Albumen gland (a. gl.}, talon (t.) and beginning of the her- 

 maphrodite duct (h. d.) , of the same individual X 4, the 

 organs separated. Fig. 5. Genitalia of an individual carry- 

 ing two uterine young, the anterior one about at full term 

 X 1%. &. gl., albumen gland; atr., atrium; h. d., hermaph- 

 rodite, or ovisperm duct; r. r., right retractor muscle; p. r., 

 penis retractor; p., penis; sp., spermatheca; t., talon; ut., 

 uterus. Fig. 6. Uterine young of the same, ventral aspect. 

 /., foot ; p., podocyst. Somewhat less than natural size. Fig. 

 7. Free retractor muscles, dorsal aspect, br., branch of left 

 retractor; I. o. r., left ocular retractor; I. r., left retractor; 

 p., penis; ph., pharynx, or buccal mass; ph. r., pharyngeal re- 

 tractor; p. r., retractor of the penis; r. o. r., right ocular re- 



