178 Marine Investigations in South Africa. Vv' . V. 



characters and atlinities of the new genus which I have found it 

 necessary to estabhsh will be discussed later. 



Family ASCIDICOLID^. 



ZANCLOPUS- CEPHALODISCI, gen. et. sp. nov. 



Adult Female. 

 (Plate XVIII., figs. 1-8.) 



Total length, •55-'62 mm. 



The body is stout and maggot-shaped, about 3|^ times as long as 

 wide. Tlie integument is thin and membranous, and the segmenta- 

 tion, especially in the abdominal region, is very obscure. The five 

 thoracic somites are defined by deep constrictions and overlap a 

 little at the sides, hut do not form collar-like folds on the dorsal 

 surface as in Enterognatluis. The thoracic limbs, with the exception 

 of the fifth pair, are articulated on the ventral surface of the body, 

 and are almost invisible when the animal is viewed from above. 

 The head is slightly narrowed in front, and there is a blunt, deflexed 

 rostrum, only visible from beneath (fig. 1). Posteriorly the body 

 tapers gradually, without any marked constriction. The genital 

 somite is very short and is obscurely defined from the somites 

 in front and behind. The openings of the oviducts are lateral in 

 position (fig. 6). The copulatory pore was not observed. The 

 following four somites are rather obscurely separated. The 

 furca (fig. 6) is short, the rami not much longer than wide, each 

 terminating in four short spiniform points directed outwards. 



The antennules and antennae (fig. 4) are short, thick, and not 

 distinctly segmented. The former have each a single terminal seta 

 and a minute seta on the posterior edge. 



The mouth-cone (fig. 5) is not very prominent. The lower lip has 

 large lateral lobes. The mandibles each end in a scythe-shaped 

 blade projecting between the upper and lower lips. No trace of 

 a mandibular palp could be detected. 



Immediately behind the mouth-cone on each side is a rounded 



Giesbrecht has overlooked the fact that Enterognathus was figured (but not 

 named) many years ago by Prof. W. C. IMcIntosh (" Observations on the Marine 

 Zoology of North Uist," Proc. Roy. Soc. Edinburgh, v., p. 611, fig. 5, 1860. The 

 figure is reproduced in the same author's " Marine Invertebrates and Fishes of 

 St. Andrews," 1875, p. 140). 



* From. ^ayK/Xo)', a sickle, and -ddf, a foot, in allusion to the sickle-shaped 

 claws on the thoracic feet of the female. ? 



