. Bulletin of the British Museum (Natural History). THE "ROSAURA" EXPEDITION 155 Family Amphiuridae Amphipholis gracillima (Stimpson) (Text-fig. 8). Ophiolepis gracillima Stimpson, 1852 : 224. Amphipholis gracillima, Ljungman, 1867 : 314. St. 22. 17° 28' N., 88° II' W. (Belize Harbour, British Honduras); two-feet dredge ; 6 m. Six specimens. Most of Stimpson's original specimens had lost their discs, as three of the present specimens have done . None has complete arms but many long fragments remain, and where they are fractured they show no sign of tapering to an Fig. 8. Amphip
. Bulletin of the British Museum (Natural History). THE "ROSAURA" EXPEDITION 155 Family Amphiuridae Amphipholis gracillima (Stimpson) (Text-fig. 8). Ophiolepis gracillima Stimpson, 1852 : 224. Amphipholis gracillima, Ljungman, 1867 : 314. St. 22. 17° 28' N., 88° II' W. (Belize Harbour, British Honduras); two-feet dredge ; 6 m. Six specimens. Most of Stimpson's original specimens had lost their discs, as three of the present specimens have done . None has complete arms but many long fragments remain, and where they are fractured they show no sign of tapering to an Fig. 8. Amphipholis gracillima (Stimpson). Ventral view of a middle arm segment. The species does not appear to have been described as possessing tentacle-scales. The present specimens have two, a long narrow inner scale reaching slightly further than the segment to which it belongs, and a small outer scale. One specimen sent to the late Dr. H. L. Clark of the Museum of Comparative Zoology, was compared by him with a specimen of the same size from Tobago and with one of the types of Amphipholis gracillima. He thought there was no doubt that the " Rosaura " specimens belong to this species, but their tentacle-scales, particularly the inner, are bigger than in the type and the Tobago specimen. They are accordingly figured here. The specimens retain in spirit bars of a rich reddish colour at the distal end of each arm-segment on the underside. Family Ophiochitonidae Ophionereis dolabriformis^ sp. n.^ (Text-figs. 9-11). St. 35. 9° 25' N., 59° 52' W. (off the mouth of the river Orinoco) ; otter trawl; 86 m. One specimen. Diagnosis. A species of Ophionereis with very fine disc-scales, becoming a little larger around the radial shields ; supplementary dorsal arm-plates very small ^ dolabriformis = axe-shaped, referring to the ventral arm-plates. ' Owing to delay in publication of this paper a brief description of this species has already appeared in print. (A. M. Clark, 1953, A Revisi
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