ANNELIDES. 
285 
glue anteriore sejunctis, internis (protractilibus ?) ; clitello in anteriore 
corporis parte posito, parum ab orificio oris remoto ; setis in singulo cor- 
poris annulo (clitelli annulis exceptis, setis 4 tantum instructis) octo in- 
ferioribus, in annulis anterioribus per paria approxiniatis, in iis partis 
corporis posterioris sensim inter se magis remotis. Species : G. maxi- 
mm; corpore annulis plusquam 400 instructo, colore nigricante^ Leuckart 
distinguished in this worm an anterior portion, a clitellus, and a trunk. 
The anterior portion is thickest, and consists of fourteen rings. The 
clitellus is formed of nine rings, and leaves free, as it does not quite 
surround the body, a furrow of 3-4'" upon the under surface. The last 
ring of the extraordinarily long trunk is rounded obtusely ; but whether 
the opening found in it be actually the anus, is a matter of doubt, since a 
piece of the body might easily have been torn off. The first three small 
rings, of the anterior part of the body, are ribbed longitudinally ; be- 
tween the fourth and fifth rings of the clitellus, on the under side, near 
the thickened margin of the clitellus, Leuckart discovered a small round 
elevation, in the middle of which was a small hole, evidently the sexual 
opening. On the anterior margin of most of the body rings, except the 
first thirteen of the anterior portion, and some rings of the clitellus, there 
are two small openings on the under side, which he supposes to be 
branchial apertures. 
Hoffmeister has written a very excellent dissertation on Luinbricinoi ; 
“ De vermibus quibusdam ad genus Lumbricorum pertinentibus.” Bero- 
lini, 1842. To avoid repetition, it will be discussed with another treatise, 
by the same author, on land Annelides, in next year’s report. 
Stein has published a short description of the sexual parts of the (re- 
genwurm) grub (Miill. Arch. 1842, p. 270). 
Loven has given an interesting contribution to the, as yet, wholly un- 
known history of the development of the Annelides (Archiv. 1842, th. 1, 
p. 302, and Ann. des Sc. Nat. t. xviii. 1842, p. 288). He caught in the 
sea, small creatures, in the form of an oval disc, and a hemisphere arose 
from the disc. The disc was beset, at the margin, with a double row of 
vibratile cilia. On the upper side, near the margin, a mouth was dis- 
tinguishable, set with cilia ; and on the top of the hemisj)here was an 
opening, apparently the anus. Upon the under, slightly arched side of 
the disc, was observable an opaque spot, with two small points. The 
hemisphere became gradually elongated, divided into transverse rings, 
and the spot, above mentioned, became gradually more opaque, and 
acquired two filiform appendages ; — in short, the creature changed into 
a Nereid ; but its last metamorphosis, unfortunately, could not be 
watched to the end. 
De Filippi has published his researches on the genus Clepsine, “ Let- 
tere del Dott. F. de Filippi sopra I’Anatomia e lo Sviluppo delle Clep- 
sine. Pavia, 1839.” He has here more exactly characterized a species, 
329 
