Norwegian Solenogastres. 39 
On the median septum the ova were formed in separate folliculi; 
one cell of the follicles is developed to the ovum, the others which 
surround it, produce a thin membrane or chorion covering the egg. 
The pericardium was filled with ova which showed a papillary appe- 
arance, probably due to shrinking of the membrane named (fig. 54). 
From the posterior end of the pericardium the coelomoducts 
emerge (fig. 54), canals of uniform breadth, which open inferiorly 
at the sides of the intestine, into a pair of large tubes forming 
the proximal part of the shell gland. These tubes are at their 
foremost ends beset each with one shortly stalked seminal vesicle 
(v. s.) with thin walls and of an ovoid shape and situated in the 
prolongation of the tube. In their distal parts the tubes widen 
into a pair of ampullae which join into a narrow unpaired outlet 
debouching immediately below the anus. 
Inferiorly to the shell gland there appear a pair of somewhat 
cubic vesicles (fig. 54 v.), which open beneath the genital aperture. 
Each of these vesiculae surrounds a spicular sheath or copulatory 
organ (c. 0.) containing a strong spine and opening in a sinus 
of the cloacal chamber.') Anteriorly these sheaths are prolonged 
into a muscle fascicle fixed on the body wall beneath the vesicula 
seminalis. A smaller fascicle extending forward serves as pro- 
tractor of the copulatory organ. The spicula, in the largest 
Specimen examined, were found ejaculated in the cloacal chamber 
and in the rectum; in the copulatory sheath of the smaller spe- 
cimen only some fragments remained. They are rather long, stafi- 
like, thicker in the basal part, which is semi-opaque, while the 
apical half is hyaline; in section they are rhomboidal. Their 
length attained 2 mm. 
The genus Dorymenia was established by HEATH in 1911 on 
the basis of the single species D. acuta dredged at St. Barbara 
Island, off Southern California, at a depth of 302—638 fathoms. 
It is an interesting fact that closely related species not only of 
this but also of some other genera are to be found at so remote 
a district as the Norwegian coast. The differences between the 
present species and the typical one are unimportant. The relative 
dimensions seem to be equal, though the Norwegian form attains 
a larger absolute size, on the assumption, that the Californian 
maximum specimen (35 mm) was full-grown. In D. acuta there 
1) These sheaths are mentioned by HANSEN 1888 as a pair of penes and 
shown on his section fig. X, p. 
