Archive image from page 217 of The depths of the sea;. The depths of the sea; an account of the general results of the dredging cruises of SS. 'Porcupine' and 'Lightning' during the summers of 1868, 1869 and 1870, under the scientific direction of Dr. Carpenter, J. Gwyn Jeffreys, and Dr. Wyville Thomson depthsofseaaccou02thom Year: 1874 174 THE DEPTHS OF THE SEA. [chap. iv. perisom. The plates of the disk are soldered together, so as to form a close mosaic (fivaelop). The mouth-papillae are fused into two lines, their number being only indicated by grooves. The lateral arm-jolates are un
Archive image from page 217 of The depths of the sea;. The depths of the sea; an account of the general results of the dredging cruises of SS. 'Porcupine' and 'Lightning' during the summers of 1868, 1869 and 1870, under the scientific direction of Dr. Carpenter, J. Gwyn Jeffreys, and Dr. Wyville Thomson depthsofseaaccou02thom Year: 1874 174 THE DEPTHS OF THE SEA. [chap. iv. perisom. The plates of the disk are soldered together, so as to form a close mosaic (fivaelop). The mouth-papillae are fused into two lines, their number being only indicated by grooves. The lateral arm-jolates are united together above and below, the upper and lower arm-plates are reduced to mere rudiments, and there are no tentacle pores beyond the iirst arm-joints. Fro. Si.—Dorynchns thomsoni, Norman. Once and a half the natural size ; everywhere in deep water. In our new species, which I name provisionally OpMomusium lymani, the diameter of the disk is 28 mm., and the length of each arm 100 mm. in large specimens. The two lateral arm-plates, fused together above and below, form complete rings, their distal edge notched on each side for the insertion of seven arm spines, of which the lowest is much longer than the rest. The dorsal arm-plates are small and diamond-shaped, let in between the lateral arm- plates at the distal end of their upper line of
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