516 PROCEEDINGS OP THE ACADEMY OP [1899. 



heavily callous, and in its natural position on the back of the 

 animal lower than the membranous portion. The part exposed is 

 greenish brown, the part covered by the mantle Avhite. The oral 

 tentacles are auriform and directed forward, the rhiuophores 

 stout and canaliculate. Length of the figured specimen (in alcohol) 

 11 cm. 



The walls of the stomach are set with about ten large horny 

 plates. The genital opening is beneath the gill, about the middle, 

 not at the posterior extremity. The purple gland is very large. 



The jaws are subtriangular, horny and brownish. The radula 

 consists of numerous close-set teeth, but the rows are somewhat 

 wide apart. Each tooth consists of a narrow basal plate with one 

 long thin cusp. IS'o central tooth or central space is distinguishable. 



I am inclined to think that D. Hasseltii F6r., D. variegata Pease 

 and D. Teremidi Rang are aU one species. The last named 

 differs chiefly in having the mantle sky-blue, but in animals with 

 protective coloration environment might produce such variations. 

 Dolabrifera Gray. 



D. Tahitensis Pse. is common on all the islands under stones at 

 low-water mark. I obtained it at Apia, Manono and Tutuila. 

 Pease's description and plate (^Amer. Jour, of Conchology, 1868, 

 p. 77, Plate viii, fig. 5) are quite accurate. In many speci- 

 mens the bright blue eyes are very large and conspicuous, but 

 there was some variety in this respect, as also in color. Perhaps 

 the distinction between D. Tahitensis and D. olivacea is not very 

 marked, and the two species may be connected by intermediate 

 forms. I also obtained one specimen of D. fiisca at Apia, but 

 have nothing to add to Pease's description. 

 Notarchus Indicus Ciivier. 



Three specimens obtained at Apia in June seem referable to this 

 species, though smaller than the recorded size. The animal is 

 capable of assuming two forms of exceedingly diflerent aspect, 

 one globular, and one sluglike and elongated. It is active in its 

 movements and in captivity seemed to prefer swimming to creep- 

 ing. As it moves, water is taken in through the dorsal opening 

 between the epipodia in the anterior part of the body, and ex- 

 pelled from it rhythmically. The integument is transparent and 

 allows the intestines to be seen distinctly. 



