168 Transactions. 



that the single hook, which is far projecting and has the form characteristic 

 for that species, is accompanied by the capillaries which are characteristic 

 for F. lingulata. 



In F. semiannulata, Ehlers says that the dorsal bristles are 5 or 6 in the 

 mid and hind segments of the body, but more numerous in the anterior 

 segments. On the other hand, he is less definite for F. lingulata ; all he savs 

 is that they number 10, without any reference to the region of the body. 



In these specimens from the Kermadec Islands I find the following 



numbers : — 



Specimen from Specimen from 



Kermadec Auckland (apparently 



(F. lingulata). F. semiannulata). 



Parapodium 1 . . 8 long and 1 short. 8 long and 1 short. 



2 



3 



15 



40 



7 >> • >> 8 ,, 1 



7 „ 1 „ 6 1 



4 „ J or 2 short. 6 „ 1 



4 „ 1 or 2 „ 4 2 



Examination under a dissecting-lens will reveal only the long ones, since the 

 shorter ones are also much finer. 



Ehlers had only a single individual of F. semiannulata on which to 

 found his diagnostic characters, and it appears to me that he had before 

 him merely a much contracted individual of F. lingulata. 



When examining mounted preparations of the hooks of the Kermadec 

 specimens I was puzzled to find that in some instances they resembled 

 Ehlers' figure (pi. vii, fig. 5) of those of F. lingulata, and in other cases from 

 the same specimen they recall those of F. semiannulata (Ehlers' fig. 9). It 

 occurred to me that perhaps the act of covering, and the consequent pressure, 

 might explain this difference. So I examined and drew under camera lucida 

 some hooks mounted in water without a cover-slip ; these exactly resemble 

 those of F. semiannulata. When the cover was put on, and excess of water 

 drained away, they recall Ehlers' fig. 4 — that is, F. lingulata. I made several 

 such preparations ; in some cases the change was less obvious. I also drew 

 the outlines, under the camera, of hooks from various individuals from the 

 Kermadec and from the Chathams and from New Zealand, with rather sur- 

 prising results, for sometimes on one and the same preparation (in glycerin e- 

 jelly) I found one hook like fig. 5 and another like fig. 9 of Ehlers' 

 memoir. Sometimes the form is intermediate ; that is, the angle — which for 

 semiannulata is so marked, and for lingulata a very open one — is midway 

 between them. 



Another interesting case w r as a mount of a foot of a Kermadec specimen 

 in which there are two hooks — a far-projecting one, and one that only just 

 cuts through (text fig. 9). The longer one resembles Ehlers' fig. 5, the shorter 

 approaches his fig. 9, though, as the hook was not flattened out as in other 

 mounts, owing to the presence of the thick foot, the angle which the claw 

 makes with the shaft is less marked than in Ehlers' fig. 9. Another apparent 

 difference lies in the detailed outline of the claw — in his fig. 9 (of semi- 

 annulata) there is a slight swelling just above its union with the shaft, as 

 in fig. 5 (for lingulata) ; it is absent in both his fig. 10 (semiannulata) and 

 fig. 4 (lingulata). 



Ehlers, in his second paper on our Annelids (1907, p. 21), quotes my note 

 to him that accompanied the specimens of F. lingulata sent to him — that 

 " in life it is partly greenish-blue and partly brown." This agrees with the 

 coloured figure of Schmarda's Pherusa bicolor. And he also puts on record 



