512 PROCEEDINGS OF THE ACADEMY OF [1899. 



NOTES ON TECTIBRANCHS AND NAKED MOLLUSKS FROM SAMOA. 

 BY C. ELIOT. 



Between the middle of May and the end of July, 1899, I 

 collected a number of mollusks on the coasts of the Samoan 

 islands, chiefly on the reef at Apia. Some of the Tectibranchs 

 and Nudibranchs which I obtained seem to me to be undescribed 

 species, and few of them have been examined in the living condi- 

 tion by more than one or two observers. I therefore submit the 

 following notes, to those who are interested in this group of ani- 

 mals. My best thanks are due to the authorities of the Smithso- 

 nian Institution at Washington and the Academy of Natural 

 Sciences of Philadelphia, especially to Mr. Pilsbry, for assistance, 

 and to Dr. Nolan for access to the Library of the Academy, 

 without which the specimens collected could not have been iden- 

 tified. 

 Cryptophthalmus cylindricus Pease. Amer. Jour, of Conch., IV, p 74. 



Pease's description and figure are accurate. I obtained several 

 specimens of this animal at Apia. It is about an inch or an inch 

 and a quarter long and generally black, but two specimens of 

 apparently the same species are grayish white. The form is 

 elongated and cylindrical, the epipodia being closely applied to the 

 back, but the living animal sometimes contracts into a ball, and 

 all my alcoholic specimens have assumed this shape. The shell is 

 on the hinder part of the body. Avhite, transparent, and nearly a 

 quarter of an inch long. It is external and not covered by the 

 mantle, though like all the dorsal region it is hidden under the 

 epipodia. Branchia on right posterior side of body adjacent to 

 the shell, but not covered by it. 



All my specimens were found in the interior of a closely grow- 

 ing, bushlike seaweed. 

 Doridium (Aglaia) Pilsbryi u. sp. PI. XIX, fig. la, 16. 



Body oblong. Two dorsal shields, of wliich the anterior has 

 free margins all round and the posterior a free margin only behind. 



