1905. | SPECIES OF WORM FROM THE RED SEA. 561 
this septum is not quite so strongly developed as those which lie 
in front. The last hearts lie in segment xii. The nephridia are 
obvious 1n segment Xv. 
The spermathece, which open in line with the male pores, 7. e. 
with seta 5 of Michaelsen’s scheme * , havea single diverticulum of 
about half the length of the pouch itself, Their pores are situated 
between segments vii./vill. and viil./ix. 
The spermiducal glands, like those of some, but not every, species 
of the genus, possess a distinct duct separable from the glandular 
and also tubular region by a constriction and by its nacreous 
appearance due to the strong muscular coat. The elandular part 1s 
fully six times as long as the muscular duct. The duct in the 
fully mature is aioeret into a horseshoe- shape. It is of uniform 
thickness thoughout, and does not increase in diameter towards 
the external pore. 
For the purposes of an easier comparison with other species I 
append a definition of this new Pontodrilus, which I propose to 
name after Mr. Crossland. 
Pontodrilus crosslandi, sp. n. (Text-fig. 78.) 
Length about 100 mm. Prostomiwm epicheilous (4-3). Sete 
paired rather distant ; distance a—b less than e-d.  Clitellum xitir.— 
avi. Male pores (on xvii.) and spermathecal pores (vii./viii., 
viti./ix.) im line with seta b. Papille paired on intersegmental 
areas wxtit./xiv., xiv. /av. Last thickened intersegmental septum 
xiti./xiv. Last hearts i inaxiit. Spermathece with single diverticulum 
half the length of the pouch. Spermiducal glands with distinct 
muscular Hab. Shores of Khor Dongola, Red Sea. 
In view of the cutting of the Suez Canal and the alleged and 
consequent migration of the Wileu eines nen fauna eastwards and 
of eastern at some to the same 7, it is important to note that the 
species Pontodrilus crosslandi is by no means a variant of, or most 
nearly related to, the Mediterranean P. littoralis. It comes 
nearest, as I am inclined to think, to P. laccadivensis and P. 
matsushimensis var. chathamiana by reason of its anteclitellian 
papille, unknown in other species. It lacks the papille following 
the male pores, which are so general in Pontodrilus. 
To emphasise the likenesses and also the differences between 
P. crosslandi and P. laccadivensis I add a figure of the latter 
(text-fig. 79, p. 560) for purposes of comparison. This species has 
not yet been figured, though its essential characters have been 
described £. 
* Oligocheeta, in ‘ Das Thierreich,’ 10 Lief. (Berlin, 1900). 
+ E. A. Smith in P. Z. S. 1891, p. 396. 
{ Beddard in ‘The Fauna and Geography of the Maldive and Laccadive Archipe- 
lagoes,’ vol. iv. pt. iv. p. 374. 
