52 University of California Publications. [ ZooLocy 
dorsal views; and I have thought the lateral views would supple- 
ment to good advantage the figures of other writers. 
Before the alternation of generations in salpa was known, the 
oozooid and blastozooid generations were described as separate 
species; and, of course, were given different specific names. In 
most instances the describers of the two generations were differ- 
ent persons. From this duplication of names considerable con- 
fusion has arisen, not all writers having adopted the same course 
in the treatment of the names after the true relations between 
the two generations had been recognized. Following the lead 
of Krohn, 1546, the majority, probably, of authors have retained 
both the specific names, writing them with a hyphen, thus, Salpa 
democrata-mucronata. Others, on the contrary, have retained 
but one of the names, but unfortunately those who have adopted 
this course have not all retained the same name; thus Lahille, 
1890, has used confoederata, and Brooks, 1893, scutigera, for SN. 
confoederata-scutigera. I have followed Krohn, with the slight 
modification that I have uniformly placed that name first in the 
couplet that was proposed at the earlier date. This has reversed 
the order in several species, as, for example, S. fusiformis-runci- 
nata, this being written by other authors runcinata-fusiformis. 
But as fusiformis was proposed by Cuvier in 1804, while runci- 
nata was introduced for the other generation by Chamisso in 
1819, it seems more fitting that fusiformis should lead in the 
couplet, as should also the name Cuvier indicating the author’s 
names after the species. 
The species treated in this paper are as follows: 
SALPIDAE. 
Cyclosalpa bakeri, n.sp. 
Cyclosalpa affinis. 
Salpa fusiformis-runcinata. 
Salpa tilesvi. 
Salpa democratica-mucronata. 
Salpa zonaria-cordif ormis. 
Salpa cylindrica. 
Salpa conf oederata-scutigera. 
DOLIOLIDAE. 
Doliolum tritonis. 
Doliolum ehrenbergii. 
Doliolum miilleri. 
