EEPORT ON THE ANNELIDA. 
443 
between many closely allied forms, yet the apparent stability of the characters, is another 
feature of note. This is especially observed in regard to the hooks, which play an 
important part in discrimination. The species of Artacama and Terebellides may be 
instanced as examples. 
The representatives of the new genus Eupista all come from very great depths, and the 
condition of the branchige is interesting in connection with the habitat. The diminished 
branchiae of PistcCmirahilis are also noteworthy in this respect. ■ 
The new genus Euthelepus is intermediate between the Ampharetidse and the 
Terebellidse. The branchiae resemblino; those of the former, the hooks those of the latter. 
One species of this genus comes from the great depth of 2160 fathoms. 
Claparede ^ gives some excellent observations on the family, especially concerning 
the arrangement of the hooks. The recent paper on the Terebellidae of the Adriatic by 
Marenzeller,^ also, is most creditable both on account of his wide knowledge of the 
subject and the mode in which he utilises the parts best procured in Museums (viz., 
hooks and bristles) as well as the accuracy of the illustrative figures. It will be most 
useful in faunistic work. 
Ampliitrite, 0. F. Muller. 
Ampliitrite kerguelensis, MTntosh (PI. XLVIII. fig. 7 ; PI. XLIX. fig. 1). 
Ampliitrite kerguelensis, MTntosli, Ann. and Mag. Nat. Hist., ser. 4, vol. xvii. p. 321, 1876. 
Ampliitrite kerguelensis, Grube, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, August 1877, 
p. 511. 
Ampliitrite kerguelenensis, MTntosb, Zool. Kerguel., Trans. Venus Exped. Phil. Trans., vol. 168, 
p. 260, pi. XV. kg. 13 (book). 
Habitat. — Numerous fine specimens were dredged at Station 149 (Kerguelen), 
January 9, 1874; lat. 49° 8' S., long. 70° 12' E.; depth, 20 fathoms; sea-bottom, 
volcanic mud. Also at Station 149c, January 19, 1874 ; lat. 49° 32' S., long. 70° 0' E.; 
depth, 60 fathoms; sea-bottom, volcanic mud : and at Station 149g, January 29, 1874 ; 
lat. 48° 50' S., long. 69° 18' E.; depth, 110 fathoms; surface temperature 40°*2 ; sea- 
bottom, volcanic mud. 
The length of a fine example is about 150 mm., and its breadth anteriorly is 9 mm. 
This form was first found in Eoyal Sound, Kerguelen, by Mr. Eaton, during the 
Transit of Venus Expedition, and described as above noted. It is a large species, and 
apparently abundant at Kerguelen. Like Ampliitrite ciri'ata, 0. F. Muller, this has 
seventeen pairs of bristle-tufts. 
Four lateral lobes occur in the cephalic region (PI. XLA’III. fig. 7), viz., the anterior 
1 Annel. Chetop., p. 385. ^ Sitzungsh. d. Ic. preuss. Akad. d. Wiss., Bd. l.xsxi.'c. p. 151, 1884. 
