302 MR. W. D. LANG ON GROWTH-STAGES [Mar. 2, 
represented, it appears, when present, immediately on the 
peduncle and without any preliminary long katagenesis from 
costal-stage VI. Also intercostal dissepiments occur on the 
three species of this group. 
Text-fig. 44. 
PARAS/MILIA MANTELLIT, 
Eilwards & Hamre. 
TROCH OID 
STAGE. 
—— RESUVENES CENCE 
TROCHOID 
STAGE. 
Cc: 
C. PEDUNCLE STAGE. 
B. 
vals 
Costal stages in P. mantelli Edwards & Haime. 
Type-specimen, B.M. no. 48413. x 3. 
As soon as cost appear on the peduncle of P. mantelli, they 
are low and ornamented with few large granules which tend to 
mass together (text-fig. 44, B, costal-stage VII., A is the pre- 
costal stage). The coste then rapidly rise in height, become 
thinner and the granules become heaped in masses (text-fig. 44, C, 
costal-stage VIII.). At about halfway in the Trochoid shape- 
stage intercostal dissepiments occur; and from here to nearly 
the top of the Trochoid shape-stage the granules tend to dis- 
appear from the sides of the coste and to form a ridge along 
their top (text-fig. 44, D', stage between costal-stages VIII. 
and IX.). At the top of the Trochoid stage the coste have 
become high and thin with a sharp wavy edge, and the granules 
