6 OPISTHOBRANCHIATA OF BRAZIL 



of locality and date were taken by the collector, so that nothing 

 can be given as to the color, or form of body in the living animal. 

 In the study of the collection most of the specimens have been 

 dissected, and many parts have been cut into serial sections, or 

 otherwise prepared for microscopical study. All of these prepara- 

 tions, as well as the animals themselves, or what remains of them, 

 are deposited in the Zoological Museum of the Leland Stanford 

 Junior University, and their serial numbers are given under each 

 species in the present paper. 



The following is a conspectus of the seven forms discussed 

 in the following pages. 



Order OPISTHOBRANCHIATA. 

 Suborder Tectibranchiata. 

 Tribe Aplysoidea. 



Family Aplysiidae. 



1. Tethys dactylomela (Rang). 



2. Tethys cervina Dall and Simpson. 

 Tribe Pleurobranchoidea. 



Family Pleurobranchidae, 



3. Pleurobranchus agassizii sp. nov. 



Suborder Nudibranchiata. 

 Tribe Doridoidea. 



Family Dorididae. 

 Subfamily Discodoridinae. 



4. Discodoris branneri sp. nov. 



5. Discodoris voniheringi sp. nov. 

 Subfamily Diaululinae, 



6. Peltodoris greeleyi sp. nov. 

 Tribe Aeolidoidea. 



Family Aeolididae. 



7. Spurilla braziliana sp. nov. 



The complete list of the Opisthobranchiate Mollusca of the 

 Brazilian coast thus far described, together with those above 

 listed is as follows. Those marked with an asterisk are deep 

 water forms, i. e. 100 fathoms and over, and are of wide distri- 

 bution throughout the Atlantic Ocean, 



