174 “Bulletin American Museum of Natural History [Vol. LIII 
an outgrowth of the mantle, which is slit along its lower side or, in other 
words, folded around the slender penis, which projects from its summit. 
Unfortunately, no specimens of full size were preserved in alcohol, 
the largest being 41 mm. long. Several of 38 to 41 mm. opened, were 
females. Of nine specimens with shells from 26 to 30 mm. long opened, 
eight were males. Further examination should be made of shells 50 to 
70 mm. long, to ascertain whether the male is smaller than the female. 
The penis agrees with that of Pzla celebensis (Quoy and Gaimard), as 
figured by those authors,! Pzla globosa, figured by Bouvier,? and P2la 
cinerea (Reeve), examined by Hagler.* It is also similar in structure to 
the penis of several species of Lanistes which we have examined. In 
America the same type of penis was found in Pomacea gigas (Spix) 
by Sachwatkin,* in Pomacea patula catemacensis H. B. Baker and 
ye Cc \ ¥ 
Fig. 15. Penis of Pomacea paludosa (Say). a, seen from below; b, in section; 
and c, turned back under the mantle. 
Pomacea (Ceratodes) cornuarietis (Linneus), by us. In an _ un- 
determined species of Pomacea from Lake Nicaragua the general 
structure is the same, but the penis is small, less than half the length of 
its sheath. In Pomacea. paludosa (Say), of Florida (Fig. 15), there 
' Is no inclosed penis even at the base. The coiled sheath appears to have 
taken over its function. We found the same structure in Pomacea 
gevesensis (Deshayes) from Georgetown, British Guiana, collected by 
H. Lang. 
Radula.—In Pila congoensis (Fig. 1386, page 168) the poral tooth 
is squarish, having steep lateral margins, the upper margin therefore 
long. The lateral tooth has a very,wide body, the second cusp from inside 
very large. The two marginals are nearly alike, both having an upper 
long and lower short cusp. The formula of cusps is 2-2-4-5-4-2-2. 
oe ‘Voyage de l’Astrolabe, Atlas, Mollusques,’ Pl. vi 
L. Bouvier. 1888. tud ’ i ; 
Paris, pp. 63*-85*, Pl. rx. ude sur l’organisation des Ampullaires.’ Mém. Soc. Philomath, 
31923, Acta Zoologica, Ys, pp. 371-3738, figs. 17-19. 
4 ° . . e 
. opVigtor, Sachwatkin, 1920. ‘Das Urogenitalsystem von Ampullaria gigas Spix.’ Acta Zoologica, 
