56 BRITISH TUNICATA. 



is not displayed externally ; the anal margin is 

 fringed with six or seven large, obtuse, reflected pro- 

 cesses. 



The reproductive organs (fig. 43) are large, elongated, 

 crescentic bodies, each of which is composed externally 

 of an irregular double row of white or yellowish 

 ovigerous lobes ; and on the inner surface there are 

 three or four large, irregularly-rounded, white bodies 

 composing the male organ ; the oviducts are short and 

 wide, and issue from the ventral extremity of the organ 

 in the direction of the atrium; the vas deferens is short 

 and much constricted, adheres to the inner surface of 

 the ovary, and opens near the origin of the oviduct. 

 In one of the two specimens examined the right-hand 



0(1. 



v. 



ts. v. v. d. 



FIG. 43. Reproductive organs of Molgula siphonata. Magnified, r. Ovary. 

 od. Oviduct, ts. Testis. v. d. Vas deferens. 



organ had both the ovarian and spermatic ducts with 

 two nipple-like outlets, one probably being ovarian, 

 the other spermatic ; it may be that this is the normal 

 condition of the right-hand genital mass. 



The cardiac cylinder is wide, decidedly arched, and 

 w r ell rounded at the extremities. 



7. Molgula socialis Alder. 



(PL XXVII, figs. 1 and 2 ; PI. XXVIII, figs. 1 and 2 ; 

 PI. XL VIII, fig. 2 ; and fig. 44 in text.) 



Molgula socialis ALDER in Ann. Nat. Hist. (3) XI [1863], 

 p! 159. 



Boily ovate, covered with fine sand, adhering by a 



