OPISTHORKANCHIATE MOLLUSCA 331 



NUDIBRANCHIATA CLADOHEPATICA 

 Family: MOHDITDM. 



Sun- f A M l l y : CKATENIIN M . 



Hervia ceylonica, n. sp. -Plate I., figs. 1 to 5. 



Amongst the Nudibranchs obtained from oysters hung over the ship's side, in the 

 Gulf of Manaar, were 12 specimens of a small Eolid, length 8 millims., which seems 

 to belong to the genus Hernia. This genus is closely allied to Cratena, and is dis- 

 tinguishable externally by the large tentacles, smooth rhinophores, grouped papillae, 

 and produced anterior angles of the foot ; and internally by the single series of arched 

 teeth strongly denticulate on either margin. 



The specimens here described have the body pale and semi-translucent, the papillae 

 with fawn-coloured hepatic contents, probably faded, long and slender, with distinct 

 white cnidogenous sacs. They are arranged in 5-6 irregular transverse rows, the 

 first row widely separated from the rest. The tentacles are long, very thick at the 

 base, and tapering evenly to a point. The rhinophores are short, slender, and smooth, 

 the eyes being visible at their base. The anterior angles of foot are moderately 

 produced, the tail slender and moderately long (Plate I., fig. 1). 



The jaws are of the usual shape in the Cratenidae, with rather short cutting edge, 

 irregularly denticulate. The radula has a single row of arched teeth, with an acute 

 apex and 5 strong lateral denticulations on either side (Plate I., fig. 2). 



The genital organs did not show any sign of armature*. 



Bergh refers three species to this genus, two from the Mediterranean, and one, 

 H. rosea; Bgh., from Amboyna ; and in addition to these Alder and Hancock (5) 

 have described another species from Ceylon, under the name of Eolis militaris, which 

 appears to be undoubtedly a Hervia, though Bergh (9), probably by an oversight, 

 refers it to Coryphella. It is distinguishable from the present species by its much 

 larger size and the possession of 7 lateral denticulations on the radula teeth. 



Kelaart has given names to 8 species of Eolis from Ceylon, but his descriptions 

 are so vague as to be practically worthless. 





 Sub-family: TERCtIPEDIN^E. 



Galvina producta, n. sp. Plate I., figs. 6 to 9. 

 In company with the last-mentioned species was one specimen whose characters, 

 with one exception, agree with those of the genus Galvina. 



Length, 9 - 5 millims., papillae inflated, tapering, constricted below the tips, which 

 are somewhat opaque, hepatic contents vesicular-looking, rhinophores moderately long, 

 tentacles short, anterior angles of foot produced. 



Colour, faded, a light transparent brown without markings ; hepatic contents 



2 u 2 



