NOTES ON SOME BRITISH NUDIBRANCIIS. 379 



points inwards when the organ is retracted. Shortly after the bifurca- 

 tion the female branch receives a long duct (Fig. 27, g.) into which open 

 the follicles of the albumen gland (Fig. 27. h.). This gland, like the 

 hermaphrodite gland, is extensively ramified, especially in the last fourth 

 of the body. Close to the entry of this duct and lying anteriorly is a pouch- 

 like diverticulum (Fig. 27. f.) which is probably a spermatotheca. No 

 second spermatotheca was found. The female branch here makes a sharp 

 turn and runs backwards nearly to the end of the body; it then doubles 

 on itself and runs forwards, opening anteriorly close to the male orifice. 

 All this section (Fig. 27. i.) of the female branch after the spermatotheca is 

 very much larger than the other parts and provided with remarkably 

 thick glandular walls. Tt should probably be regarded as the uterus 

 passing through the mucus gland. It is one of the largest and 

 most conspicuous organs in the animal, and when sections are cut it 

 generally expands and overlaps the heart and kidney.* This, however, 

 appears to be the result of the disturbance caused by the cut, and not 

 a natural arrangement. It is noticable that near the bifurcation of the 

 male and female branches there arises a coocum which extends anteriorly 

 and reaches the integument, but without forming any orifice. Pelseneer 

 states (Eecherches sur divers Opisthohranches, p. 62) that in Elysia the 

 second female orifice is developed later than the others and is not found 

 in young individuals. It is conceivable that this coecum in Alderia may 

 ultimately open externally. 



The pericardium appears to be as usual and is medio-dorsal. The 

 renal organ (Fig. 28. k.) lies below it and is entire in the front, but the 

 posterior portion gives off ramifying tubes, some of which extend into 

 the cerata. 



Blood lacunae are distributed throughout the body, including the foot. 

 The largest lie one on either side of the renal organ below the cerata, 

 into which they send up long diverticula; the main portion of these 

 diverticula lies on the posterior side of the cerata, which no doubt 

 accounts for the peculiar pulsation and contraction noticed by Alder 

 and Hancock in this part. 



STILIGER BELLULUS (D'ORBIGNY). 



) = CdlUojxaa hellula, n'OiiniONy. Mag. de Zool., 1837, pp. 12 to 14. 



Stiliijer marim, Bergh. Mai. Unt. in Semper's Iteisen, Ileft iii, 1872, pp. 137, 



144 ;/(^. Beit, zur Kennt. der ^olid., v. pp. 12 to 17.) 



Bergh has published two detailed description of this species, which I 

 notice here merely to mention that it apparently ought to be called 

 St. hellulus and not St, marice. 



* Tliis dislocation slltiis <lue to the elasticity and expansive power of the tissues which 

 form the walls of the uterus. 



.NEW SEUIES. — Vl»L, VII. NO. 2 2B 



