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Show 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 be 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. O. Goodridge, Surgeon R.N.). Coloration creamy yellow, in alcohol, after perhaps thirty years' preservation. Measurements.-Diam. of disk 19 ; 16 m m . Length of arms 74 ; 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. capensis, from above, X 2. 4. Mouth-angle of P. capensis, X 4. 5. Mouth-angle of Ophiopeza assimilis, X 2. 6. Mouth-angle of Ophioglypha amphitrites, X 4. 3. O n certain Points in the Visceral Anatony of Balceniceps rex, bearing upon its Affinities. By F R A N K E. B E D D A R D , M.A., Prosector to the Society, Lecturer on Biology at Guy's Hospital. [Received May 9, 1888.] I have been able lately, through the kindness of Mr. Charles Stewart, to examine the viscera of a specimen of Balceniceps 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 |