232 CLASS VII. 
bekannte arien aus der Familie der Regenwiirmer, mit Zeichnungen 
nach dem Leben. Braunschweig, 1845, 4to. 
- On the anatomy compare Montrcre Observations sur les Lom- 
brics ow vers de terre, Mém. du Museum, 1. 1815, pp. 242—248, Pl. 
12; J. Leo De structura Lumbrici terrestris, Regiomonti, 1820, 
4to, cum Tab. en.; C. F. A. Morren Commentatio de structura 
anatomica et historia naturali Lumbrici vulgaris sive terrestris 
(Annal. Acad. Gandavensis), Gandavi, 1829, cum tabuls, ke. 
The setz are short and rigid, in every ring 8, on each side two 
pairs, so that eight rows run longitudinally on the body, four laterally, 
and four beneath; in Hypogewon Sav. there is moreover another 
row of single hairs in the middle of the back. The intestinal canal 
is straight, with a membraneous pyriform proventriculus and a round 
or spherical muscular stomach ; behind the stomach it is divided by 
many transverse folds into blind pouches, which further back are 
less developed, where also the intestinal canal becomes smaller 
though on the whole it is wide throughout. In the interior of the 
canal on the dorsal side is a band, which begins a little behind the 
stomach, at this anterior end, as also at the posterior, runs to a 
point, and consists of two membranes, of which the external is 
yellow, the internal white ; intestinwm in intestino Wiis, typhlo- 
sole Morren. This enigmatical part is probably a duplication of 
the membrane of the intestine, an internal mesentery (Morren) ; it 
may be compared with the valvular membrane of certain sharks’. 
To the sexual organs belong in the first place three pairs of grey- 
yellow saccules which are situated in the anterior part of the body 
(in the common large earth-worm, Lwmbricus agricola HOFFMEISTER, 
in the eleventh, twelfth, and thirteenth ring), and of which the 
posterior pair is the largest. These parts are usually considered to 
be ovaries, but Steenstrup, who here also denies Hermaphroditism, 
supposes them to be ¢estes in which the seed is formed with the 
spermatozoa in cells, that may be readily mistaken for eggs. 
H. Mecket maintains that these organs are in all individuals testes, 
and says, that the ovaria, intimately conjoined with them, lie like 
a brown-yellow lobe on each of these saccules. Four small vesicles, 
resembling barley-corns, placed more laterally (two on each side), 
contain in the pairing seasun a white fluid with spermatozoa free 
and developed: by most writers they have been signalised as the 
1 Perhaps also it is furnished with a vessel (Vena mesenterica interior); see 
DUVERNOY in the second edition of Cuvimr, Leg. d’ Anat. comp. Tom, y. 1817, p. 335. 
