New Doliolids — Tokioka and Berner 
137 
plankton sample taken at Meteor station 267, 
in the layer between 400 and 200 meters, in 
the Atlantic Ocean off Cape Verde. Our speci- 
mens differ distinctly from Kruger’s species 
in the following points: (1) The ventral longi- 
tudinal muscle connects muscles III and IV 
rather than muscles II and III as in D. meteori. 
(2) The oesophageal opening is situated on 
the middorsal line just anterior to muscle VII 
while in D. meteori it is located centrally on 
the level with muscle VI (see Kruger’s fig. 
87). (3) Muscle VI is interrupted at the mid- 
ventral line in D. horizoni while it is continu- 
ous in D. meteori. In one part of Kruger’s text 
figure the ventral ends of muscle VII are 
shown as if they passed internally to muscle 
VI, in another as if they passed externally to 
muscle VI. This apparent error may have been 
due to the poor condition of his specimens, 
but makes it impossible to compare the two 
species on this point. The specific name hori- 
zoni refers to the vessel which carried the 
Shellback Expedition; this follows Kruger’s 
lead in naming his species after the ship from 
which it was taken. Comparing the structures 
of D. meteori and D. horizoni we have come to 
the conclusion that the genus Doliopsoides may 
be defined as follows: 
Doliopsoides Kruger 1939: oozooid, tropho- 
zooid, and phorozooid unknown. 
Gonozooid: The gonozooid is barrel- 
shaped with eight nearly hooplike muscles. 
Muscles I through IV and VIII form com- 
plete hoops while V, VI, and VII are inter- 
rupted. In addition to the circular muscles 
there are some longitudinal muscles, which 
are variously placed on the body. Both the 
ciliated groove and the dorsal ganglion are 
situated in the second intermuscular zone. 
The gill consists of a dorsal and a ventral pair 
of lamellae. The gonads are located antero- 
ventrally to the alimentary organs. Although 
there are some rather marked differences be- 
tween our specimens and Kruger’s description 
we do not feel they warrant more than specific 
treatment. The type species is Doliopsoides 
meteori Kruger 1939. 
p.b. 
Fig. 2. Doliolina undulatum n. sp., gonozooid from 
left side. For abbreviations see Figure 1. 
Doliolina undulatum new species 
Fig. 2 
This species is represented by five gono- 
zooids from station SB- 115 and four gono- 
zooids from station SB-94. The location of 
SB- 115 is given above, SB-94 was located at 
9° 58.5' S. and 95° 01' W. These latter speci- 
mens are in a very poor state of preservation 
and we will deal here only with those from 
SB-115. They range from 3.3 to 4.6 mm. in 
length. The test is of moderate thickness but 
very soft and easily stripped from the body. 
The general appearance of the body and the 
arrangement of the eight circular muscles is 
quite similar to D. intermedium (Neumann, 
1906), which occurs frequently in the Shell- 
back area. A most striking difference is the 
interruption of muscle VII at the mid-ventral 
line in this new species. The mantle is thin. 
The muscles are narrow, especially I and VIII. 
Muscle VII is also somewhat narrower than 
the rest. 
