PACIFIC COAST OLIGOCH UTA, 83 
SPECIES OF PONTODRILUS AND PHOTODRILUS. 
P. Michaelseni| P. arene P. hesperidum P. insularis P. Marionis | P.. phosphoreus 
n. sp. | Fr. Miller & Bedd. Rosa. Perrier. Dugés. 
= ais Michaelsen. 
Nephridia commence yp re re 
492: SOMO ara cleooe xi. xii. xili ? xill. XV Xiv 
Nephropores in line 
With SUC sree) tetaists |= ? ? 4. De 2: 
Gizeardadeataeepaitee Rudimentary. | Absent. Absent. Rudimentary.) Rudimentary? Absent. 
esophageal swellings..| None. None. None. None. None. Four in x-xiil. 
Glandular crop....... Large in xiv, | None. None. None. Present. None. 
XV, Xvi. | | 
Septal glands.......-- In vy to ix. ? | None. None. Present. In y-ix. 
| 
Penial sete ........-.-| Absent. Absent ? Absent. Absent. Absent. In xviliand xii 
Common set, ........ Plain, regular.| Ornamented, | Plain, regular.) Plain,irregular Plain, regular. Plain, regular. 
regular. | behind. 
| 
. . | . . | . . . . . . . 
Spermatheca.......... Two pair in| Two pair in| Two pair in| Two pair in| Two pair in One pair in ix; 
viii and ix;|] viii and ix;| viii and ix;| viii and ix;| viii and ix; one diverticle. 
| one diverti-| one diverti- | one diverti-| no diyerti- | one diverti- 
| cle. cle. cle. cle. cle. 
Sperm-sacs.......---- Two pair,| Two pair, | Twopair,rac-| Two pair, | Two pairin xi Two pair in xi 
grape-like, grape-like,| emose,in xi| grape-like, | and xii. and xii. 
in xiand xii.|. in xiand xii.) and xii. in xiand xii. | 
| | 
Glitetin eras ieco a xiii-xvili, xiii-xvii, eed |? xiii to xvii xili-xyli ? 
incomplete. incomplete. | complete (?). 
| 
Prostomium . ........| Encroaches on! Encroaches }| ? Does not en- | Encroaches on Does not en- 
somite 1. on somite 1. | croach on! _ somite l. croach on so- 
| | somite 1. mite 1. 
; , my ee] | 
Ventral papille....... In xvii and xix One central, 
xix—xx, and one 
| ditto, xx—xi. 
abun. pen bas ats Guaymas, Desterro, Jamaica. Aru Island. Marseilles. France. 
Mexico. Brasil. 
In the above table I have principally followed Beddard, but I cannot agree 
with his opinion as regards the identity of Grube’s P. /ittora/is, with that ot P. Marionis 
of Perrier. As Perrier remarks, the ventral median papillee described by him in P. 
Marionis are not found in P. /ittoralis, in which species these papillee were paired. 
Until Grube’s species has been found and redeseribed we must therefore accept it as 
a separate one. It is of course not by any means impossible that one or more species 
of Pontodrilus are to be found in the same locality. 
In reference to the gizzard I have given it as rudimentary in two species. This 
refers only to an anterior gizzard close behind the pharynx, in which the muscular 
layer of the cesophagus is simply thickened as shown in fig. 46 Aands. Beddard says 
that P. /ittoralis Grube has also a rudimentary gizzard, but I think that he judges by 
M. Perrier’s description of what I call a glandular crop in the somites posterior to the 
testes. It may not be impossible that the muscular thickening of the cesophagus 
really exists in all the species more or less prominently, as it is easily overlooked. 
