28 DR J. STEPHENSON ON 
The mouth was a much elongated slit, situated behind the slight constriction which 
separated the head from the body. 
The tail (fig. 18) was a small, whitish, cylindrical submoniliform appendage of the 
posterior end of the body, ‘8 mm. long—hence visible to the naked eye without difficulty. 
Examined some months afterwards in spirit, the general colour of the specimen was 
a light brown, with no distinction between dorsal and ventral surfaces. The cephalic 
grooves were very distinct ; the mouth appeared as a roundish hole. 
Examination of Sections.—The anterior end of the animal was sectioned in order 
to investigate certain other characters which have been used for diagnostic purposes in 
descriptions of species of this genus. Of these the following may be mentioned :— 
The cephalic grooves are deep ; they would have to be one-third to one-fourth deeper 
than is actually the case in order to reach the brain. The cerebral organ is at first on 
the outer side of the brain; farther back it fuses with the dorsal ganglion, and then 
completely surrounds the hinder end of the latter as in a case. The dorsal ganglia are 
larger than the ventral. 
As usual in the genus, there is no diagonal muscular layer; and neurochord cells 
are absent. 
I propose the following diagnosis for this form :—Length 65 mm., breadth 24 mm. ; 
resembles Lineus gesserensis in appearance. Colour light brown, margins of head 
and body whate, ventral surface whitish. Head slightly marked off from the body, 
not broader than the succeeding part. Cephalic grooves along margins of head, 
reaching anteriorly to its tip. Eyes mm two rows, one row anteriorly near margin 
on each side, 5-8 in each row, small and imconspicuous except the anterior ones. 
REFERENCES TO LITERATURE. 
(1) Benuay, W. B., “The Platyhelimia, Mesozoa, and Nemertini”: Part IV. of A Treatise on Zoology, ed. 
Lankester, London, 1901, 
(2) Bircmr, O., ‘Untersuchungen iiber die Anatomie und Histologie der Nemertinen. . .,” Zeitschrift 
fiir wiss. Zool., 1., Heft 1, 1890. 
(3) Birerr, O., “Die Nemertinen des Golfes von Neapel,” Fauna und Flora des Golfes von Neapel, 
22 Monographie, Berlin, 1895. 
(4) Borer, O., “Nemertini,” Bronn’s Klassen und Ordnungen des Tierreichs, Band iv., Supplement, 
Leipzig, 1897-9. 
(5) Birarr, O., ‘ Nemertini,” in Das Tierreich, Berlin, 1904. 
(6) Coz, W. R., ‘‘Nemerteans of the W. and N. W. Coasts of America,” Bull. Mus. Harvard, vol. 
xlvil., 1905. 
(7) Joupin, L., “Recherches sur les Turbellariés des cétes de France (Némertes),” Arch. Zool. Eapér. 
(2), viii., 1890. 
(8) Jounin, L., “ Les Némertiens,” Paune Francaise, pub, par les soins de R. Blanchard et J. de Guerne,. 
Paris, 1894. 
(9) Jounin, L., ‘‘Némertiens,” Blanchard’s Traité de Zoologie, fasc. xi., Paris, 1897. 
(10) MacIntosu, W. C., A Monograph of the British Annelids, Part I.: “The Nemerteans,” London,. 
1873-4. 
