REPORT ON THE TUNICATA. 103 



The Genital Organs consist of a scries of about twelve rudely cubical masses, which 

 adhere to the inner surface of the mantle proper, and arc covered by the lining membrane 

 of the peribranchial cavity, into which they project (PL VIII. fig. 10). They are situated 

 rather towards the ventral edge and occur on both sides of the endostyle, the majority, 

 however, being on the right side. 



Each genital mass consists chiefly of a spherical spermarium or testis out of which 

 leads a delicate somewhat undulating vas deferens. As the genital masses on each side 

 are arranged in two or three converging series (PL VIII. fig. 10), the testes in each series 

 are united by a vas deferens, and the several vasa deferentia then join to form a common 

 duct (PL VIII. fig. 9, v.d.), which opens into the peribranchial space near the atrial 

 aperture. 



Round the vasa deferentia uniting the different genital masses, and round the genital 

 masses themselves, lie the ova (PL VIII. fig. 11, ov.), and these continue up to the point 

 of convergence, where there is a short wide membranous tube serving as an oviduct 

 (PL VIII. fig. 9, o.cl.) and opening alongside the common vas deferens. 



The masses of ova are yellow, while the Lunches of spermatic vesicles composing the 

 testes (PL IX. fig. 17a and b, t.v.) are pale whitish yellow. The vasa deferentia show 

 as opacpie white lines running through the masses of ova. The ova are in various 

 stages of development, very young ones, in which there is httle vitellus round the 

 germinal vesicle (PL IX. fig. 16b), being numerous. The more mature ova (PL IX. 

 fig. IGa) are enclosed each in a capsule formed of cubical or low columnar cells (PL 

 IX. fig. 16c). 



Two specimens of this species, one of them somewhat injured, were obtained in the 

 Pacific Ocean, west of Japan. 



Station 241. June 23, 1875. Lat. 35° 41' N., long. 157° 42' E.; depth, 2300 

 fathoms; bottom temperature, 1°"1 C; red clay. 



< hdeolus wymlle-thomsoni, Herdman (PL X. figs. 1-6, and PL XIII. figs. 5 and 6). 



C Ki/ril/r-fhnmsoni, Herdman, Preliminary Report, Proc. Roy. Soc. Edin., 1880-81, p. 84. 



External Appearance. — In this species the "body "part is rather larger and the 

 peduncle shorter than in Culeolus murrayi. The general shape of the body (PL X. 

 fig. 1) is irregularly pyriform, or almost wedge-shaped, on account of the great difference 

 in the width at the two ends ; there is no Literal compression. The anterior end, where 

 the stalk is attached, is narrow and tapering. The posterior end, on the contrary, is very 

 broad, but not so much rounded as in the last species. It is divided by the atrial aperture 

 into a dorsal and a ventral portion. The latter is straight, has a truncated appearance, 

 and forms almost a right angle with the posterior extremity of the ventral edge. The 

 dorsal portion, on the contrary, is rounded off, forming a gentle curve, ami becoming con- 

 tinuous with the dorsal edge. The dorsal and ventral edges are very irregular, more so 



