1915.] NATURAL SCIENCES OF PHILADELPHIA. BRYA 
Length 18, diam. 5 mm.; whorls 16 
a3 177i (79 (73 (79 
4.8 LG 
inne LZ: 4.2) Sas 
“ec ie (73 5 co a3 153 
cc 7, (73 4.8 ce cc 153 
oe lose. 2 458°“ ley. 
male bG.o ors i 4A oe ras 
ey NG. Sie) dt ame 
sé 16 a3 5.5 cc cc 134 
“e 16 ve 4.5 (as (a9 143 
“ 16 6c 4.5 (a3 cc 15 
pal elrons. sa 2. 4.5F | Sie Ss 
paloma eek Got ee ala 
aC ae a “143 
epee, ALAS "4 145 
pete he AOS | gale 
46 15 ce An) a3 ce 14 
oka Le: 2 Ae ara: sae ghia ie 
(3) Three lamella, superior, axial and basal. Six individuals 
=A 
Length 20.5, diam. 4.9 mm.; whorls 17 
73 20 “ (73 
5 es 
3 920 73 4.9 (a3 ce 1('7/ 
0 gS) aa tae” eo Be ky 
ad 19 ce 5 ce ce 17 
In size, sculpture and shape, we can find no external character 
correllated with the differences in internal structure. The speci- 
mens from Station 5 are from one colony. 
It will be seen that the typical bilamellata axial structure pre- 
dominates, nearly 70% having that arrangement of lamelle. The 
dimensions of this lot agree well with those given by Bartsch for 
§ specimens in the U. 8. Nat. Mus., but our lot, being larger, includes 
shells both larger and smaller than any in the original lot. 
Holospira bilamellata longa n. form. Plate VII, figs. 2 to 20. 
Slender and pillar-like, the diameter contained four times or more 
in the length; whorls of the cone and last whorl costulate, 3 to 5 inter- 
mediate whorls usually smooth or nearly so. Aperture projecting 
laterally and forward; usually 3 internal lamelle, in the beginning 
of the penultimate whorl, therefore ventral in position, the superior 
lamella generally very strong, and larger and longer than the basal. 
Length 19.6, diam. 4 mm.; whorls 17 
6é 19.2, 6c 4 (a3 6c 184 
POUCIE VG eat ae yt mand 
