No. 424.] THE GENUS TRYPANOSYLLIS. 299 
. Habitat, Pacific Grove, California; between tide marks. 
The form seemingly most nearly allied to 7. ingens is Tryp- 
anosyllis gigantea (M’Intosh) Ehlers of the Southern Ocean. 
The latter is but little inferior in size, measuring, according to 
M'Intosh,! 90 mm. in length and 7 mm. in breadth. The form 




—— PN 
Sa 
; a7 a Bi 
i n. C * ^ dia. 
ep- - 4 
ts a 
tm. JT / La 
$ E = 
Fic. 6.— Transverse section, female zooid of T. ingens, right half. A portion of the dorsal 
body wall (indicated by dotted lines) is broken away. The plane of th ti ters 
ight. aZ.c., rudimentary alimen! 

the septum on the rig men tary ; d.v., dorsal blood vessel ; 
v.v., ventral ditto; mes., dorsal mesentery ; £7., problematic glandular structure (external 
: Sei erse muscle ; 
extremity) ; #.c., nerve cords ; /.m., longitudinal musculature; £.»»., transv m 
ef., epidermis. x roo. 

c 
Lo? 
he 
A 


Lda a 
"uu. ee n ES 
Fic. 6 A.— Problematic gland-like tube, from right side of another section of the same series, 
with portion of body wall adjacent. The external extremity (aperture?) is toward the 
right. The tube is laid open by the section, showing ends of columnar cells. ring 
as in Fig. 6. x roo. yo Bie 
is very similar, the parapodia of both have multiple aciculæ 
(6 in T. gigantea), and the sete of the.two species are prac- 
tically identical. There is nothing, however, in M’Intosh’s 
description or in his figure of a cross-section to indicate that 
-1M'Intosh, W.C. Challenger Reports. The Polychaeta, vol. xii (1887), p. 193- 
