404 PROCEEDINGS OF THE GHOLOGICAL SOCIETY. [ Mar. 23, 
STRAPAROLUS WRIGHTIANUS, nov. sp. (PI. XXVI. fig. 23.) 
Shell small, discoidal, plano-concave above, deeply but narrowly 
umbilicated below ; whorls five, regularly rounded, slightly embra- 
cing, smooth. 
The species is related to S. minutus, Schibler, from the “ zone of 
Ammonites opalinus,” but differs in its fewer and embracing whorls, 
giving it a more compact form, and in the absence of a keel. 
Dimensions. Diameter 0:15 inch ; height 0:1 inch. 
Dedicated to my friend Dr. T. Wright, from whom I received the 
species, having been obtained by Mr. Brady in the residuum of 
washings for Foraminifera. 
The species associated with S. Wrightianus are S. bellulus, nov. 
sp.; S. aratus, nov. sp.; Lttorina biornata, noy. sp.; Pecten 
acutiradiatus; Dentalium minimum, Strickland; Leda Galatea, 
D’ Orb; Waldheinna numismalis; a few Ammonites (A. Loscombi, 
juv., &e. ), &e. 
Locality. Near Lyme Regis (zone of Am. Jamesont). 
STRAPAROLUS BELLULUS, nov. sp. (Pl. XXVL fig. 22.) 
Shell small, discoidal, plano-concave above, deeply but narrowly 
umbilicated below; whorls five, regularly rounded, slightly embra- 
cing, marked by numerous longitudinal costule and crossed by faint 
strongly arched lines of growth. 
Of about the same size as 8. Wrightianus, but the last whorl is 
proportionally higher. 
STRAPAROLUS ARATUS, nov. sp. (Pl. XXVI. fig. 21.) 
Shell small, discoidal, plano-concave above, deeply but narrowly 
umbilicated below; whorls five, regularly rounded, slightly embra- 
cing, ornamented with numerous thick flexuous ribs, attenuated at 
the suture and on the margin of the umbilicus. 
But for the asymmetrical form, the shell of this species might be 
mistaken for that of some varieties of Ammonites Jamesont, notably 
A. polymorphus interruptus, Quenstedt. 
Though the above species of Straparolus are closely allied by their 
external figures, yet the numerous specimens I have examined 
exhibit no gradation in their ornamentation from one species to 
the other, and consequently they should rank as distinct species. 
Lirrorina BIORNATA, nov. sp. (PI. XXVI. fig. 17.) 
Shell ovate, imperforate; spire elongated, acuminate ; whorls eight, 
subinflated ; anterior whorls with two strong acute encircling ribs, 
last three whorls ornamented with about eight decurrent thick 
coste ; aperture subovate, entire ; columella straight, slightly effuse 
at the base; base subglobose, smooth. 
Dimensions. Length 0-22 inch ; diameter of last whorl 0-08 inch. 
Locality. With Straparolus Wrightianus &c. near Lyme Regis, 
zone of Ammonites Jumesoni (very common). 
TURBO CRYPTANIOIDES, NOV. Sp. 
Shell turbinated, depressed, much broader than high; spire acute ; 
