284 MR. F. E. BEDDARD ON THE VISCERAL [May 15, 



and succeeding shorter, triangular in shape, with the apex proximal. 

 All the side arm-plates meet their fellows below, the line of suture 

 deep ; above the insertion of the spines they appear to form a scale 

 on the side of the arm. Upper arm-plates broader than long, very 

 regularly oblong, though the proximal edge is encroached upon by 

 the scale-like portions of the side arm-plates ; a good deal arched 

 near the disk. 



Disk bulging a little between the arms, flat, covered with plates of 

 various sizes, among which the five primary and the central are very 

 distinct ; a not very regular row of plates extends along the middle 

 of each interbrachial space as far as the edge of the disk. Just 

 below this there is one very large plate. Radial shields rather long, 

 broader without than within, where they are pointed ; separated 

 from one another. The scales on the actinal surface diminish in 

 size and increase in numbers from without inwards. Papillae along 

 edge of genital scale small, numerous, closely set ; about twelve may 

 he seen from above, of which the uppermost are smaller than those just 

 beyond them. Arm-spines three or four, of which the uppermost is 

 longest, and longer than an arm-joint. Three tentacle-scales as far 

 as the sixth or seventh arm-joint ; a rudimentary third may persist 

 for some further distance ; after a time the second scale disappears 

 and only one persists. 



Hab. Ecuador ; from the Haslar coll. (J. 0. Goodridge, Surgeon 

 R.N.). Coloration creamy yellow, in alcohol, after perhaps thirty 

 years' preservation. 



Measurements. — Diam. of disk 19 ; 16 mm. Length of arms 7-4 ; 

 54. Breadth of arms at base 5 ; 3"5. Length of radial shields 4 ; 

 3-3. 



EXPLANATION OF PLATE XVI. 



Fig. 1. Pectinura ramsayi, from above, to show the general form of the body. 



2. Mouth-angle of P. ramsayi, X 2. 



3. P. capcnsis, from above, X 2. 



4. Mouth-angle of P. capcnsis, X 4. 



5. Mouth-angle of Ophiopeza assimilis, X 2. 



6. Mouth-angle of Ophioglypha amphitrites, X 4. 



3. Oa certain Points in the Visceral Anatony of Balaniceps 

 rex, bearing upon its Affinities. By Frank E. Beddard, 

 M.A., Prosector to the Society, Lecturer on Biology at 

 Guy's Hospital. 



[Keceived May 9, 1888.] 



I have been able lately, through the kindness of Mr. Charles 

 Stewart, to examine the viscera of a specimen of Balteniceps rex 

 preserved in the stores of the College of Surgeons. The specimen 

 was purchased from this Society some 25 years ago ; it was one of 

 those brought back by Mr. Petherick in 1860. 



So far as I am aware there has been no description of the viscera of 



