18 PROCEEDINGS OP THE ACADEMY OP [1880. 



ut the inside of the root of the hook quite as in the Ad. pacifica. 

 The external teeth (fig. 15) only nine or ten in number,^ fewer than 

 in that species, always absent on more than half the tongue. 



The salivary glands as in the next species, also the oesophagus, the 

 stomach and the intestine. The liver also of nearly the same form, 

 the inferior part of the posterior end continued as a little cone ; the 

 surface (especially of the back part) yellowish-white ; the substance 

 yellow. The vesica fellea in its usual place, small. The heart as 

 usual, also the sanguineous gland. The renal syrinx and the urinary 

 chamber as usual. 



The anterior genital mass rather compressed, of angular-roundish 

 outline, of about 1.15 mm. largest diameter. The spermatoduct seemed 

 shorter than in the next species, especially the second part ; the penis 

 short. The spermatotheca pyriform ; the spermatocysta of more oval 

 form, having only about one-quarter of the size of the former, and fiUed 

 with sperma. The mucous gland whitish and yellowish. 



2. Adalaria paciflca, Bergh, n. sp., PI. IX, fig. 17 j PI. X, fig. 1-3; PI. XI, fig. 1&. 



Color lutescens. 



Denies laterales (magni) hamo edentulo ; externi numero 15. 



Habitat. Oceanum Pacificum (Unalashka). 



Of this species Dall caught three specimens, in September, 1874, at 

 Unalashka, on a bottom of mud and shells. 



According to Dall, the color of the living animal is " yellowish ; '* 

 the specimens preserved in spirits were of a uniform yellowish color. 

 The length of the two larger specimens about 12.0 to 14.0 mm., by a 

 breadth of 8.0 to 9.0 mm , and a height reaching 4.5 to 5.0 mm. -, 

 the breadth of the foot 6.0 mm., the height of the rhinophoria about 

 1.5 mm., of the branchial leaves 1.2 mm. 



The form as in the Ad. proxivia, a little broader anteriorly. The 

 back covered all over with a mass of rather stout, subglobose and sub- 

 petiolate tubercles quite as in the typical species, mixed with much 

 fewer smaller ones. The larger ones, under magnification, showing 

 the perpendicular spicula shining through, while other spicula were 

 detected irregularly scattered in the intervals between the tubercles. 

 The rhinophor-holes nearly without projecting margin ; the adjoining 

 part of the back, behind, smooth ; immediately before the holes, on 



* The number of external plates is, according to Alder and Hancock, 

 ten, to Meyer and Moebius, eight or nine. 



