348 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



.1 granulate mass and are not separately distingiiisliable. The buccal 

 ganglia seem to be as in Boridopsis, not as in BoriopsiUa. 



The stomach is entirely enclosed in the liver, which is yellow within 

 and without, not very compact, cleft behind, and attached to the floor 

 of the body-cavity by a muscular strap. The hermaphrodite gland does 

 not differ from the liver conspicuously in colour. The heart is as 

 usual in the genus. At the point where it is attached to the peri- 

 cardium is the so-called pericardial gill — a line about 6 mm. long 

 of yellowish lamella3, each about 2 mm. wide. 



The ampulla of the hermaphrodite gland is stout and brownish. 

 After about 10 mm. comes the bifurcation. The male branch at first 

 covers the spermatotheca with thick soft coils ; this part of it would 

 probably be about 60 mm. long if stretched out. It then passes into 

 a thinner portion with strong muscular walls, which enters the penis 

 sac. The presence of an armature was not satisfactorily demonstrated. 

 Some rather large transparent prominences were found on the lower 

 vas deferens, but could not be isolated, nor is it certain that they were 

 hard. In the female branch a thin tube runs from the bifurcation to 

 the spermatotheca, which is very large and almost sessile on the duct. 

 It is full of spermatozoa and has very thin walls. The spermatocyst 

 is small. It is in all probability naturally pear-shaped, but the 

 contents are squeezed up into the top so as to make it appear globular. 

 It has a very long duct. On the vagina is a vestibular gland. 



DoRiDOPsis ciTRiNA, Cheesemau. 



Doridopsis citrina, Cheeseman : Trans. New Zeal. Inst., vol. xiii, 

 p. 223, 1880. 



Seven specimens. The largest is 24 mm. long, 7 "5 high, and 

 18 broad, but the real breadth is greater, the mantle-margin being 

 folded. The animals are flattish in appearance, moderately soft, and 

 of a uniform pale yellow. 



The back is covered with numerous well-developed tubercles of 

 rather irregular shape and size, and sometimes confluent ; near the 

 margin the tubercles are smaller and the intervals between them 

 larger. The rims of the rhiuophorial and branchial pockets are slightly 

 raised, thin, and not tuberculate. The branchiae are 5 and tripinnate. 

 The mantle-margin is fairly ample, and in places shows spicules 

 arranged in a reticulate pattern, but the integuments are thick and not 

 very transparent. The spicules are of various sizes and shapes, such 

 as straight and smooth ; straight with a projection on one side, 

 V- shaped and Y- shaped. The foot is fairly broad, not much pointed 

 before or behind. In some specimens, but not in all, a groove can be 

 seen on its anterior margin. 



The central nervous system is as in Doridopsis, not as in BoriopsiUa. 

 The buccal ganglia are set at some distance behind the main mass of 

 the nerve-collar. From the buccal cone issues a tube which describes 

 a fairly large loop to the left and then contracts. At this point are 

 the buccal ganglia united to the anterior nerve centres by fairly long 

 connectives which run across tlie end of the loop. The tube does not 



