162 



The list of Opisthobranchiata obtained through the expedition of Dr. Mortensen 

 is the subsequent one : 



Tectibranchiata. 



Aplysia immunda, Bgh. n. sp. 

 Aplysiella unguifera (Rang) ? 

 Aplysiella incerta, Bgh. n. sp. 

 Aclesia ocelligera, Bgh. n. sp. 



Doridium Rneolatum , H. et A. Adaiis. 



Atys naucum (L.). 



Philine quadripartite, Ascan. var. Siamensis. 



Ascoglossa. 

 Plahobranchus ocettatus, van Hass. 



Nudibranchiata. 



Thordisa macuUgera, Bgh. 

 Chromodoris histrio, Bgh. 

 Casella atromarginata (Ctjv.). 

 Idalia plebeia, Bgh. n. sp. 

 Phyllidiella pustulosa (Crv.l. 



— iiobilis, Bgh. 



Doriopsis rubra, Kelaart. 



— nigra (Stisipson). rar. nigerrima. 

 DoriopsiUa pallida, Bgh. n. sp. 



Marionia chloanthes, Bgh. n. sp. 

 Bornella digitata, Ad. et Reeve. 



— excepta, Bgh. 

 Melibe bucephala, Bgh. n. sp. 

 Nossis indica, Bgh. N. Gen., n. sp. 



Marsenia perspicua (L.). 



