Morse.] 348 [March 19, 
ing orifices, which are strongly ciliated, as well as the tubes them- 
selves, even to their external orifices, the ciliary action always di- 
recting the currents out of the body. 
The concentrated character of the Brachiopods, and the limited 
perivisceral cavity, reduce the segmental organs, or oviducts, to the 
lowest number, and consequently we find in most of them but a sin- 
gle pair, as in Lingula, Discina, and Terebratulina, while in Rhynch- 
onella two pair of oviducts are present. It is significant to note 
that in the last named genus both pair of EVSEOS have their inner 
mouths turned toward the back. 
In a special memoir on the oviducts of Brachiopoda, now in prepa- 
ration, I shall demonstrate the unquestionable character of these 
organs. 
Having studied them in living Lingula, Rhynchonella and Terebratu- 
lina, and in alcoholic Discina, 1 find them presenting only simple 
modifications of a constant type.t 
In Terebratulina the eggs were watched through the transparent 
anterior walls, after their separation from the pallial sinuses. While 
floating in the perivisceral cavity, they were seen gathered up by 
the flaring ciliated mouths of the oviducts, and were followed, as 
they slowly passed through the tubes, and caught as they escaped 
from the external orifices. 
In Lingula, Discina and Rhynchonella, the external orifices of the 
oviducts are simple slits, while in Terebratulina they project from the 
anterior parietal walls, like tubercles, as figured by Claparéde in the 
Annelid Lepidonotus (Hermadion) fragile. The glandular nature of 
the oviducts, and their striking resemblance in this respect, to similar 
parts in the worms has been alluded to under Renal Organs. 
The following figures of the oviducts of Brachiopods, from my 
own studies, and the oviducts of certain worms, as figured by Clapa- 
rede and Lancaster, are here given for comparison. 
Having considered that portion of the genital system referring to 
the ovaries and oviducts, and shown their entire vermian character, 
we come to study the male organs of generation, and in this line of 
investigation we have to push into an almost untrodden field. 
The Brachiopoda have been regarded by some authors as dicecious, 
the vascular sinuses presenting ovaries or testes, according to the sex 
1 Morse on the Embryology and Oviducts of Terebratulina. Am. Jour. Sci. and 
Arts. Vol. 1v, p. 262. 
