SOME LITTORAL OLIGOCHATA OF THE CLYDE. 63 
This species shows the commencement of definite sperm and ovisac; septum +4 is 
markedly bulged backwards, so as to reach what would normally be the hinder limit 
of the next posterior segment, and the developing sperm-morule, contained in the 
sac so formed, do not pass beyond it; similarly the ova are contained in a posterior 
bulging of septum +3. 
The funnels are between two and three times as long as broad; the vas deferens 
is a coiled narrow tube, confined to segment xii.; there is a well-marked penial bulb 
immediately on the inner side of the termination of the vas deferens at the male aper- 
ture; the vas can thus hardly be said to perforate the bulb (Pl. Il. fig. 17). The 
spermatheca and its duct have the form and relations described by previous observers ; 
there are, in my specimens, no glands round the duct or its aperture. 
LITERATURE. 
(1) Bepparp, F. E., A Monograph of the Order of Oligochexta, Oxford, 1895. 
(2) Bennam, W. B., “Notes on some Aquatic Oligocheta,” Quart. Journ, Microsc. Science, N.S., vol. 
SSS ati, WUE 
(3) Cuaparéps, E., “ Etudes anatomiques sur les Annélides, Turbellariés . . . observés dans les Hébrides,” 
Mém. de la Soc. de Physique et d@ Hist. Nat. de Geneve, tome xvi., part i., Geneva, 1861. 
(4) Ersmn, G., ‘‘Enchytreids,” Harriman Alaska Expedition, vol. xit., New York, 1904. 
(5) Evans, W., “The Oligocheta of the Forth Area,” Proc. Roy. Phys. Soc. Edin., vol. xviii, No. 2, 
1910. 
(6) Frrenp, H., “ A new British Worm,” Zoologist, ser. 4, vol. 1., 1897. 
(7) Frienp, H., “Studies in Irish Enchytreids,” Irish Naturalist, vol. xi., 1902. 
(8) Goopricu, E. 'S., ‘Notes on Oligochetes, with the description of a new species,” Quart. Journ, 
Microsc, Sci., N.S., vol, xxxix., 1896. 
(9) Hussz, R., ‘‘ Beitrage zur Kenntnis des Baues der Enchytreiden,” Zedt. f. wiss. Zool., vol. lvii., 
part i, 1893. 
(10) Micnar.sen, W., Untersuchungen tiler Knchytreus MOébii, Mich., und andere Enchytreiden, Kiel, 
1886. 
(11) MicwagtsgEn, W., “ Oligocheta,” in Das Tierreich, Berlin, 1900. 
(12) Souruery, R., ‘‘ Notes on the genus Enchytreus . . .,” Irish Naturalist, vol, xv., 1906. 
(18) Souruerry, R., “Oligocheta of Lambay,” Jrish Naturalist, vol. xvi., 1907. 
(14) SourHrrN, R., “ Contributions towards a Monograph of the British and Irish Oligocheta,” Proc. 
Roy. Irish Acad., vol. xxvii., Sect. B, No. 8, 1909. 
(15) Vusvovsry, F., “ Note sur le Pachydrilus subterraneus, n. sp.,” Rev. Biol. Nord France, vol. i., 1889. 
(16) Vesvovsxy, F., System und Morphologie der Oligochexten, Prag, 1884. 
tek) = 
EXPLANATION OF PLATES. 
Fie. 1. Diagram of the vascular system of Tubijea costatus. 
Fic. 2. Part of the anterior end of Marionina semtfusca. 
Amp., ampulla of spermatheca ; comm., communicating cord from septal glands to pharynx; d., 
duct of spermatheca; gi., gland-cells round spermathecal aperture; 7., nephridium of segment 
v.; @s., esophagus ; s*-s®, septal glands of the fourth to the sixth segment; ph., pharynx ; 
sp., septum 2. 
TRANS. ROY. SOC. EDIN., VOL. XLVIII. PART I. (NO. 2). 10 
