Ln fd 
ER 
Fee ee 
E- 
х $: 
548 Transactions. ч 
TABLE 3.—APPROXIMATE SPECIFIC Time RaNGEs—-continued. Я 
| [4| i| 3 
*X | | : | 
ъ | „| Ё | 14а 3 
— $ 19511-15198 1218151515151 oe 
215,6 Къ = © — | = = = P + T 
І &= = = E 3 S Q = © a s 
| SE а =) Li = 3 t6 & = E 4 R 
Ele а” = 3 ad & = | E р 
СС © = c S 2 z a a i З 
в {АМЕ 544 < |ж | ке] о | Е | [е E 
ЕЕ A 
Uber lateapertus | | E 
—— pukeuriensis — E: 
pseudovitreus | | E 
_—— eus x T ; 
—— barrierensis Ё x 
Amauropsella major p pore | x : 
—— teres T —— | : 
Sinum fornicatum —— | 
——— infirm | жана | 
—— cinctw ? З 
Globisinum spirale —— 
mns |a! 
—— miocaenicum b 
—— drewi F an un 
—— undulatum . . CES —l CH 
——— venustum .. Qj ge 
жыз дегн у nic Qc cir e De. 
Langential 
ulure 
abutting 
suture E. 
parietal callus З 
mbilicus Br 
билесе appressed a 
suture : 
impressed suture channelled suture 
DIAGRAM TO ILLUSTRATE TERMS USED. 
e Rouen KEY то GENERA AND SUBGENERA. d E 
l. Natica : Globose; sutures generally abutting, but sometimes tangential; parietal —— 
callus thin, separated from a prominent funicle in the umbilicus: operculum = 
ate; sutures tangential; umbilicus widely open, * 
bounded by а limb without an accompanying sulcus; funicle rudi- — 
tary ; short but fairl 
(b.) (Magnatica) : Large, globose; sutures сиы ; umbilicus open, with 
E weak on apert wall, also a weak circum-umbilical : 
2. D. : 8 globose ; umbilicus open, bounded by а 
а: Small, ; annelled ; | 
ridge with a well-marked sulcus outside it; no funicle; parietal callus only E 
