Two New Chaetognaths— Alvarxno 
69 
Fig. 2. Sagitta bierii. a, Seminal vesicles, dorsal view; b, ventral view. 
Immature specimens 16 mm. long with al- 
most no trace of ovaries were found. Others 
were observed with ovaries 1.0-1. 5 mm. in 
length. A summary of measurements is given in 
Table 1. 
DISTRIBUTION: The species was recorded by 
R. Bieri (1957) in Peruvian waters, from col- 
lections of the Transpacific Expedition, and 
from Cape Blanco to Punta Eugenia (Baja Cali- 
fornia) (Bieri, 1959). It was found in the 
CalCOFI collections of April, 1958, from Cape 
Mendocino, the northern limit of the sampling, 
down to the southern part of Baja California, 
as well as in the plankton samples from Peru- 
vian waters taken by the Consejo de Investi- 
gaciones Hidrograficas del Peru in February and 
April, 1958. 
S. bierii is found mainly from 100 to 580 
mi. offshore, and hence it is not coastal in hab- 
itat. 
RELATIONSHIPS: The shape of the seminal 
vesicles in the various forms of the ''serrato- 
dentata group” is discussed by Ritter-Zahony, 
191 1^; Tokioka, 1939, 1940; Thomson, 1947; 
and Furnestin, 1953, 1957. In the present re- 
port, based on material from the Pacific and 
the Atlantic, the differences observed are given 
in Figures 5, 6, and 7 to compare with Figures 
2 and 3. 
S. serratodentata tasmanica reported by To- 
kioka (1959) apparently is S. bierii n. sp. for 
the following reasons: 
He says that S. selkirki Fagetti, from Chilean 
waters "resembles most closely tasmanica in the 
appearance of the seminal vesicles.” This is true 
and the species are certainly synonymous. The 
characteristic of the seminal vesicles as well as 
the other specific characters are identical for 
both. The anterior part of the seminal vesicles 
in both 5'. serratodentata tasmanica Thomson 
