69 



sides. This barrier indicates the division between the wider 

 anterior and the narrower segments which follow. The cirri 

 continue along the sides backward to the tail, on every segment 

 and close to the dorsal bristles. They are on the whole longer 

 and more slender than those of the preceding species, just as 

 occurs in the British forms. 



The anus is a longitudinal dorsal slit at the tip of the tail. 



The bristles in this species are longer than in the former, 

 both ventral and dorsal of the hrst bristled segment being 

 slender, long, and finely tapered, and the tips are densely 

 covered with a slender filamentous algoid. For a long distance 

 backward both dorsal and ventral bristles remain capillary, and 

 the middle of the body is passed before the ventral hooks are 

 well developed (Plate VI., fig. 31). They are proportionally 

 longer and more slender as well as more numerous than in the 

 former species, with a slight bend of the shaft and a marked 

 curve at the tip. A slender bristle or two occurs amongst them. 

 The dorsal bristles retain the characters they have in front to- 

 the tail, so that in this respect alone there is a marked difference 

 between the species. 



The majority of the specimens were loaded with ripe ova. 



This species resembles the British Cirratulus tentaciilatiis in 

 several respects, but differs in the number and shape of the 

 ventral hooks, which are shorter and fewer in the British form, 

 in the segments of the anterior region and other particulars.. 

 In both the cirri spring close to the dorsal bristles. 



The parallelism between the two species of Cirratulus at the 

 Cape and the two common British forms is of great interest, 

 and, allowing for the variations due to the divergent environ- 

 ment, it has been thought proper to unite the respective species^ 

 This opinion to some extent is that of Marenzeller, who makes 

 the examples from Angra Pequena only varieties of the European, 

 species {I'ar. uici idioiialis, Marenzeller). Moreover, if Aitdoui- 

 nia filigera, Delle Chiaje, is synonymous then this common 

 form ranges to the Straits of Magellan.* 



Fam. HALELMINTHID^. 



The Hcdclniiiiihidcv or Cupilcllidivwere, represented by several 

 examples, one or two of which were devoid of branchiae, 

 whilst all the rest had these organs. As, however, both had the 

 same number of capillary bristles (13 pairs) and segments 

 ("thoracic") in front, and both agreed in the arrangement of 



Ehlers, Polych:t;t. Ma^yalhaen, Hamburj?, i^<97, p. iio. 



