Vou. 2] Ritter—The Pelagic Twnicata. 67 
the general surface of the animal. Color of nucleus orange, 
though not uniform in all parts. Heart between posterior end 
of endostyle and nucleus. 
This is by considerable the most abundant species of salpa 
of the western shores of North America, and probably of the 
whole Pacific Ocean, at any rate north of the equator. It has 
been taken at almost every point on the coast from Alaska to 
Lower California, and at many of these in large numbers. 
On the whole California coast it has been taken in nearly every 
month of the year, though the systematic collecting at San Diego 
thus far indicates it to be considerably more abundant during 
the summer than in the midwinter months. 
Salpa fusiformis-runcinata, form echinata. 
Fig. 14.—S. fusifornis-runcinata, echinate form.  Postero- 
dorsal view, showing serrations of test, and muscle bands. 
pop. 
1 
' 
1 
| 
i 
! 
i} 
; t 
, ' 1 
pap. : i S772. 
s.m0.T lr 
Mig. 15.—S. fusiformis-runcinata, echinate form, ventral view 
of surface. 
