REPORT ON THE TUNICATA. 115 



atrial aperture (PI. XI. fig. 13, (/.). The long axis of the stomach and of the greater 

 part of the intestine lies antero-posteriorly. 



Genitalia. — There is a single large genital gland on the inner surface of the mantle 

 on each side. Both are of pyriform shape and have short ducts directed towards the 

 atrial aperture (PL XI. fig. 13). 



The gland on the left side is the larger of the two. It lies alongside the intestine, 

 not in the loop, and has its long axis parallel to that of the stomach. The gland on the 

 right side is considerably shorter than the other. The aperture of its duel is not far 

 from the anus (PL XI. tig. 13). 



Each of the glands contains both masses of ova and spermaria arranged so as to form 

 the wall of a large cavity which occupies the interior of the pyriform mass (PL XII. 

 fig. 11). From sections of the gland one learns that the spermaria are arranged along 

 the outer surface and form a compact layer (PL XII. fig. 11, t.v.), while the ova (o.) 

 occupy the inner part next the centra] cavity, into which they project irregularly. 



The ducts from the glands are short and consist of a closely applied oviduct and vas 

 deferens, the former being the wider, and the latter slightly the longer of the two. 



There are three specimens of this species, two of which were more or less injured. 

 They were obtained in the Southern Ocean between the Cape of Good Hope and 

 Kerguelen Island. 



Station 147. December 30, 1873; Lit. 46° 16' S., long. 48° 27' E. ; depth, 1600 

 fathoms ; bottom temperature, 0°.8 C. ; globigerina ooze. 



Cvleolus perlatus, Suhm (sp.) (PL XL figs. 8 and 9, and PL XIII. figs. 1 and 2). 



Boltenia perlata, Suhm, MS., 1873. 



Culeolus suhmi, Herdman, Preliminary Report, Proc. Roy. Soc. Edin., 1880-81, p. 86. 



External Appearance. — This is the smallest of the six species, and it has much the 

 shortest stalk. The general form of the body is between ovate and w T edge-shaped, the 

 anterior end being very narrow, and the posterior much wider (PL XL fig. 8). Tin 

 form is most definite and the outline regular; there is no lateral compression. The 

 anterior end is narrow but not so produced as in the last species. The posterior end is 

 broad but not rounded. It is an oblique line sloping backwards to form an angle with 

 the end of the ventral edge, and dorsally becoming continuous by a gentle curve with 

 the dorsal edge. The two edges are very different. The dorsal is strongly convex, rising 

 suddenly behind the branchial aperture, and attaining its greatest height at about one- 

 third of the distance to the posterior end ; the ventral edge, on the other hand, is 

 almost straight, forming a long low arch from the end of the peduncle anteriorly to the 

 line of junction with the posterior end. The two sides arc equally curved. 



The peduncle is not long and is rather thin, but stiff (PL XL fig. 8). It is attached 

 to the anterior end of the body, and continues the line of the ventral edge. It turns 

 dorsally at a right angle and its course is straight as a whole, although it makes one or 



(zool. cuall. Exr. — i'akt xvu. — 1882.) I; 1(3 



