SOME LITTORAL OLIGOCHATA OF THE CLYDE. a) 
The spermathecal apparatus is represented in Pl. II. fig. 15; the general form is 
somewhat similar to that illustrated in SourHmRn’s ficures ; the ampulla, comparatively 
small, spherical or shghtly elongated, is smaller, and the duct, tuberculated as in #. 
albidus, is thicker than there depicted. 
Enchytreus albidus (Henle). 
This worm has frequently been described, but under a very large number of different 
names. According to the synonymy given by MicHag.sEN (11), thirteen authors have, 
in eighteen papers, given to this animal five generic and twelve specific names. Perhaps 
the fullest account of the worm is that given by MicHaE.seEn (10) in 1886, in his thesis 
Untersuchungen tiber Enchytreeus Mobu, Mich., und andere Enchytraiden ; GoopRicu 
MN 
Fic. 13.—a, two sete of Enchytrxus albidus. 
b, a bundle of sete of Enchytreeus albidus, 
showing two immature replacing sete, 
along with two fully formed sete which 
are destined to drop out. 
(8) has more recently, under the name L. hortensis, described a form which MicHarLsEN 
considers identical with the above, and has paid special attention to the nephridia and 
ecelomic corpuscles. A few remarks, chiefly in regard to points in which the Millport 
specimens vary from the above descriptions, will therefore be sufficient. 
The worms were found about high-water mark in places where fresh water was 
running to the shore ; it was common under stones, and also among the roots of plants. 
In length specimens are = to 14 inches; they are comparatively stout, the anterior end 
tapering, the posterior blunter ; they are whitish in colour, fairly transparent, and easy 
to examine by the microscope in the living state. Segments fifty-two to sixty-six. 
The clitellum occupies segments xi. and xiii. The animals move by crawling, or at 
times by wrigeling; they often throw themselves into nematode-like contortions ; at 
rest, in a dish, they curl themselves up. 
As to the setz, previous descriptions, and fig. 13, a, will be a sufficient guide as 
to their shape. There are no ventral sete in segment xil.; they are more numerous in 
the anterior than the posterior segments, the numbers being three to five (commonly 
four) in the ante-clitellial ventral bundles, two to four (commonly three) in the 
post-clitellial ventral bundles; for the lateral bundles the numbers are two to four 
