PACIFIC COAST OLIGOCH®TA. 171 
was undeveloped. One of the sete is a trifle more curved than the other. The 
point of each penial seta shows a slight and indistinct ornamentation (fig. 144). 
Since my first description of D. 7royeri I have found some more mature specimens at 
the old locality in San Francisco. One of these specimens possessed two penial setie 
in each sae, both slightly sigmoid, with trace of ornamentation at the free apex. In 
the variety /agune the ornamentation is more distinct. 
Common setw resemble the type, but sete a and} next posterior to clitellum 
reach their proper and final distance from each other only in the fifth somite posterior 
to clitellum, while in D. Troyeri type they reach the final distance in the third somite 
posterior to clitellum. 
INTERNAL CHARACTERS. 
Spermathece are much larger in the variety /agune, or about twice the size of 
those in D. Troyeri, with the main body distinctly contracted at the center, and with 
the apical part much enlarged. The diverticula are distinctly tri-digitate and reach 
up to the narrow contraction of the main sae. 
Prostates or spermiducal glands are much more slender and longer than in 
D. Troyer type, and generally but not always confined to one somite. 
Ovisacs are two, projecting from the Septum xili/xiv into xiv, occupying the 
largest part of the ccelomic cavity in the latter somite. The structure of the ovisac 
is characterized by numerous trabecula forming an extensive system of round pockets 
of various sizes. Where there are no pockets there are solid zones of round or slightly 
oval nuclei (fig. 147) imbedded in a dense mass of tissue without distinct cell-walls. 
PHCENICODRILUS Eisen. 
The finding of a new species of this genus enables me to more properly define 
it. The genus was originally based on the absence of a prostate at the male-pore, 
there being, however, a short muscular atrium, in which opened the spermduct. The 
type was Phanicodrilus taste, a species from the Cape Region of Baja California. 
The new species described below under the name of Phenicodrilus tepicensis possesses 
amuch more developed atrium, in shape and structure resembling a spermatheca. 
There is a total absence of glandular cells, such as are found in prostates, the whole 
atrium being muscular. There is besides another difference between Pheenicodrilus 
and Ocnerodrilus, though of much smaller importance. In Phcenicodrilus we find a 
large number of muscular fascicles divided in three paired groups in somite xvii, radiat- 
ing from the male pore. In Ocnerodrilus these arciform muscles are few in number. 
In Pheenicodrilus these muscles are so thick and numerous that the atrium itself ean 
only be seen in sections, not by suface view of the inner side of the body-wall. 
Through the possession of a muscular atrium this genus comes rather close to 
Nannodrilus Beddard. This genus, of which so far only one species is known from 
Africa, possesses a muscular bursa copulatrix, in which opens separately the anterior 
prostate and the anterior spermduct. The great similarity between the atrium in 
Pheenicodrilus and the bursa copulatrix of Nannodrilus is very striking, especially as 
Memorrs, Vou. II, 5. January 28, 1896. 
