321 



Exochella longirostris Jullien. 



Mission scientifique du Cap Horn, 1882—83, VI, Zoologie, 1888, Bryozoaires, 



p. 55, PI. 3. figs. 1—4, PI. 9, fig. 2. 



(PI. XVII, figs. 6 a-b). 



The zooecia elongated rhombic, evenly arched, provided with radiating striae and 

 rather densely covered with finer or larger tubercles. There is a distinct raised mar- 

 ginal line, and the very distinct marginal pores, of which there may be up to 10 

 on each side, lie in older zooecia in deep pits separated by projecting ribs. The 

 primary aperture, from the distal margin of which project up to 5 spines, has 

 no sinus, but runs out into a low, quadrangular median tooth, which in younger 

 zocecia can be seen distinctly through the frontal surface. 



The well-developed, tube-shaped peristome, the distal part of which has a 

 similar origin as in E. triscuspis, is provided with a median tooth, frequently 

 somewhat widened at the end and often with two or three cusps, and two finger- 

 shaped lateral teeth, which as a rule do not reach the median tooth and at most 

 touch this. Outside there is a new set, consisting of an unwidened median tooth 

 and two bluntly rounded lateral teeth. The operculum has a faint muscular ridge 

 at each of the proximal corners. 



The ooecia are furnished with fine radiating striae and enclose the spines. 



The avicularia which sometimes are single, sometimes double, have a similar 

 position and structure as in the previous species, 



A small colony from the Challenger St. 315. 



Exochella lobata n. sp. 



(PI. XVII, figs. 7 a-c). 



The zooecia hexagonal in circumference, strongly arched, often provided with 

 a number of large, scattered tubei-cles and in the younger zooecia with ca. 5 

 large marginal pores. The raised marginal lines are only feebly developed. There 

 are four spines, the two central being much thinner than the two outer thick 

 ones, which are not covered by the ooecium. Within each lateral margin the 

 faintly chitinized operculum is provided with a muscular ridge (fig. 7 c). 



The peristome, which is only developed proximally, runs out into a large, 

 thick, broad, triangularly rounded rostrum, within which there are two sets of 

 teeth. Of the teeth in the inner set, which are placed rather closely together and 

 divided by two rounded gaps, the central are as a rule hatchet-like, whilst each 

 of the lateral teeth have the form almost of half the blade of an axe. The teeth 

 outside these have a somewhat similar form, but are much more elongated and 



21 



