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BULLETIN OF THE UNITED STATES FISH COMMISSION. 
2. Tseniosoma delineatum (Delle Chiaje). 1 
Polia delineata Delle Chiaje. Memorie sulla storia e notomia degli animali senza vertebre del regno di Napoli. Naples, 
1823-1829. 
Eupolia delineata Hubrecht. Notes from the Leyden Museum, I, 1879. 
This species was represented by a portion of a single small individual from Ensenada Honda, 
Culebra. This fragment includes about 25 mm. from the anterior end of the body and shows the 
characteristic structure and markings of the species. 
Burger (Fauna u. Flora von Neapel) records this species from Barbados, and Verrill 2 has collected 
it in the Bermudas. It is likewise found in the warm waters around the whole circumference of the 
globe — from the Mediterranean, South Atlantic, East Indies, Polynesia, etc. 
3. Taeniosoma discolor, sp. nov. 
Body of large size, rather stout, with rounded margins. One of the preserved specimens showed 
a conspicuous dorsal ridge, with a median groove running throughout its length. 
Color . — There are no notes on the colorations of the living worms. The color of the preserved 
specimens is white, or grayish, with a broad, median band of darker color throughout the length of 
the dorsal surface. This darker band is about one-half the width of the body and appears to have 
been brownish or purplish in life. The sides and ventral surface were probably whitish in color. 
Size . — The largest specimen was nearly a meter in length, about 8 mm. wide, and 5 mm. in 
thickness. 
Ocelli . — The head contains numerous minute ocelli. These are arranged in two broad, irregular- 
groups of 50 to 80 or more each on the antero-lateral margins of the head. A pair of very slight lateral 
grooves extend from the terminal proboscis pore (when the head is extended) along the lateral margins 
for a short distance. The groups of ocelli are situated on the dorsal sides of the grooves. A distinct 
annular groove, marking the division between the retractile snout and the parts immediately following, 
lies directly posterior to the groups of ocelli. 
Habitat . — Ensenada Honda, Culebra, February, 1899. Two large, well-preserved specimens. 
[Burger 3 describes, from a single, headless fragment, a species from Barbados which may possibly 
be identical with the above. This species ( Eupolia antillensis ) was 75 cm. long and 6 to 7 mm. wide. 
The dorsal surface of the preserved specimen was marbled brown, while the ventral surface and sides 
were yellowish white or gray. In its internal organization the species reveals the characteristic 
features of the genus.] 
Cephalic glands . — In regard to the cephalic glands, nearly always so well developed in the group, 
T. discolor surpasses nearly all others in the magnitude to which these glands are developed. They 
not only fill up a large portion of the tissues of the head in front of the brain, but extend back of the 
mouth and some little distance into the oesophageal region. In the mouth region these cephalic glands 
are situated within the outer longitudinal muscular layer, and encroach so greatly upon the area of 
this layer that they actually occupy more space than is given to the muscular fibers themselves 
Immediately dorsal to the mouth the glands lie directly outside the circular muscular layer, and 
form a mass which is, in section, four times as thick as the more superficially placed muscles of the 
outer longitudinal layer. On the sides of the mouth the glands are scattered irregularly among the 
fibers of the outer muscular layer. Behind the mouth they become gradually less voluminous, and 
disappear somewhat farther back. I have not seen that they discharge elsewhere than on the anterior 
end of the head. 
Cutis . — The cutis glands also reach an enormous development. At the tip of the snout these 
glands are not sharply separated from the cephalic glands mentioned above, but a little way back they 
become separated into a sharply limited layer immediately beneath the fibrous layer of the integu- 
ment. This layer of cutis glands is, in most regions, at least double as thick as the epithelial layer of 
the integument. Beneath the glandular layer lies the fibrous connective tissue layer of the cutis, of 
1 In the Proceedings of the Washington Academy of Sciences (vol. m, p. 3, 4, 1901) I have given my reasons for 
adopting the generic name Txniosoma (Stimpson) instead of Eupolia (Hubrecht), which is still used by most European 
writers. 
2 Trans. Connecticut Acad., x, p. 597, 1900. The species is here referred to T. curium, but a number of specimens 
collected in the spring of 1901 undoubtedly belong to T. delineata. This further increases my conviction that the former is 
but a variety of the latter species. 
3 Beitr. z. Anat., Systematic u. Geogr. Verbreitung der Nemertinen. Zeits. f. wiss. Zool., lxi, p.29,1895. 
