540 H. p. KJERSCHOW AGERSBORG 



schwach harngelber Faibe eine Lange bis beilautig 0-8 bei einer 

 Hohe bis etwa 0-20, unci einer Breite bis 0-25 mm. erreichend. 

 Das hintere Ende des Magens (fig. 2) mit von etwa der Mitte 

 eradiirenden Falten, neben dem Pylorus hier eine taschen- 

 formige Erweiterung (fig. 'Ifg) (etwa wie in Tethys) mit 

 starken Falten der Innenseite.' In 1888: 691, the same 

 author, describing M . o c e 1 1 a t a , writes : ' ... die Magen- 

 platten schimmerten undeutlich durch ; diese letzteren fast 

 wie in der M. papillosa.' And for the last-named species 

 (1884 a) : ' . . , hinter der Mitte (des Magens) der Lange 

 nach schimmert der Zahngiirtel undeutlich hindurch.' And in 

 1902: 107, for M. bucephala: 'The belt of the stomach- 

 plates shines through in about the first half of it, and 

 immediately before the belt the foremost liver-branch is 

 attached on either side somewhat upwardly. . . . The belt of 

 plates consists of twenty-eight faint lemon-coloured firm 

 plates partly alternating in height.' Eliot (1906), describing 

 Tritoniopsis, says in regard to the stomach: ' . . . into 

 a rather small membranous and fragile stomach, almost 

 entirely covered by the liver, and no trace of plates.' And in 

 1910: p. 40 he writes : ' The liver secretions harden in the 

 stomach and form a protecting membrane which is found to 

 cover the stomach.' On the previous page he stated : ' Into 

 the posterior part open fou.r or five liver-ducts and also a 

 pear-shaped gastric pouch, whose orifice in the stomach-wall 

 is closed with a more or less distinctly developed flap. This 

 pouch is often called the gall-bladder, but nothing indicates 

 that its functions correspond to this name. Its walls are 

 glandular, and appear to secrete globules of a glistening material 

 which is also found in the intestine. It is possible that this 

 secretion subsequently dissolves and forms a membrane 

 which is found to cover the walls of the stomach and intestine, 

 and probably serves to protect these delicate surfaces against 

 the spicules abounding in the sponges on which most Dorids 

 feed.' Btomach-plates constitute a common feature among 

 species of M e 1 i b e and other related forms ; something 

 similar to stomach-plates is present in other species (Eliot, 



