MOLGULA. 41 



narrower and more regularly elliptical than they are 

 in M. conchilega, and the oviducts are shorter. In 

 both species, too, the mass on the right side is much 

 arched, and lies between the lower or rectal portion of 

 the intestine and the upper loop, or within what may 

 be termed the lower loop. A more interesting modi- 

 fication is found in I/, complanata. In this curious 

 depressed species the intestine forms a simple loop as 

 in M. eonrhilri/a, and the reproductive organs, which 

 are placed as usual, are of a narrow ovate form, with 

 the oviduct about one third the length of the intestine, 

 projecting from the attenuated extremity, which is 

 directed backwards, that is from the cloaca and towards 

 the endostyle. The ova must therefore be shed into 

 the dorsal portion of the atrium and not into the 

 cloaca, as they usually are in all the other species. 

 The organ on the right side is placed a little above the 

 extremity of the intestinal loop ; that on the left is 

 situated well backwards and considerably above the 

 cylindrical onmii connected with the heart. 



1. Molgula conchilega (0. F. Miiller). 



(PL XXIII ; PL XLVIII, fig. 1 ; and fig. 36 in 



text.) 



Ascidia conclulei/a 0. F. MULLEK Zool. Dan. Pro dr. [1776], 

 p. 225, no. 2727 ; [Zool. Dan. Icon. I (1777), pi. xxxiv, 

 ff. 4-6; Zool. Dan. Descr. I (1779), p. 84; and] Zool. 

 Danica, I [1788], p. 42, pi. xxxiv, ff. 4-6; BRDGUIERE 

 Hist, Nat. Vers, [I (1789), p. 147,] in Encycl. Meth. ; 

 [BoRY DE ST. VINCENT Vers, etc. I (1791), p. 135, pi. Ixii, 

 ff. 11-13, in Tahl. Encycl. Meth.; CTMELIN Linnaei Syst. 

 Nat. ed. 13, I, pt. 6 (1791), p. 3124; Bosc Hist. Nat. 

 Vers, I (1802), p. 104; TURTON Gen. Syst, Nat. IV 

 (1802), p. 94; FLEMING in Ecliiib. Encycl. II (1811), p. 

 544; JAMESON in Mem. Wernerian Soc. I (1811), p. 557 ; 

 PENNANT Brit. Zool. ed. 5, IV (1812), p. 100; LAMARCK 

 Hist. Nat, Anim. sans Vert. ed. 1, III (1816), p. 123; 

 STEWART Elem. Nat, Hist, I (1817), p. 392; STARK Elem. 

 Nat. Hist, II (1828), p. 117; LAMARCK Hist. Nat, Anim. 



