190 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.57. 



emargination in the middle. Fins very large, nearly semilunar, about 

 four-fifths as broad as long, and about two-thirds as long as the 

 mantle-length, feebly indented at the anterior origin. 



Head very large, decidedly broader than mantle, with big eyeballs. 

 Nuchal cartilage oblong, a little shorter than twice its breadth, nearly 

 parallel-sided and similarly rounded on both ends. Funnel broad. 

 Funnel organ as in R. pacifca. Funnel cartilage oblong, a little longer 

 than twice its own breadth. 



Arms unequal, the formula of length being 3 = 2 > 1 > 4 ; the longest 

 a little longer than the mantle-length. Suckers biserial, on the whole, 

 a little larger in the male than in the female, specially so on the lateral 

 arms. Horny ring smooth; external aperture narrow and slit-like; 

 papillate area narrow, composed of about seven rows of facets, the pa- 

 pillae of which are all faint. Umbrella similarly narrov/ all around. 



Both 'dorsal arms hectocotylized, being quite similarly constructed 

 in every respect. On the lateral aspect of the outer side there is 

 found a deep groove, marked off by a wide fold running through the 

 entire length. The suckers of these arms are affected but little by 

 hectocotylization, and number 42 and are only a little smaller than 

 those of the lateral arms. 



Tentacles when bent back, reaching the posterior end of the 

 mantle. Stem about as thick as, or a little thinner than, the arms. 

 Club occupying a quarter of the tentacle, not expanded, bent round, 

 with a narrow semilunar membrane on the dorsal side of the carpus. 

 Suckers numerous, minute, nearly uniform, arranged in about eight 

 rov.'s; horny ring smooth. 



Measurements of type: Dorsal length of mantle 36 mm.; ventral 

 length of mantle 39 mm.; breadth of mantle 33 mm.; length of longest 

 arm 42 mm.; diameter of largest arm-sucker 19 mm. 



This species stands near R. megaptcra but differs from it in the 

 ventral margin of the mantle, in the tentacular length, in the arm- 

 formula, and in the horny ring of arm-suckers. 



Type-locality. — Off Kii Province. 



Type.— C&i. No. 332833, U.S.N.M. 



37. ROSSIA BIPAPILLATA, new species. 



Plate 25, fig. 3. 



Station 5069 (Suruga Bay). One female. Cat.No. 332830, U.S.N.M. 



Surface smooth, soft to the touch. Mantle a little longer than 

 broad, of nearly equal breadth in the anterior half, rounded poste- 

 riorly. Mantle margin free all around; its ventral part projecting as 

 much as the mid-dorsal part, and forming a shallow crescentic emar- 

 gination in the middle. Fins large, being only a little shorter than 

 the body; semicircular, about half as long again as broad, their an- 

 terior origin somev.hat indented, and the most anterior edge extend- 

 ing a little beyond the mantle margin. 



