Discovery reports (1938) Discovery reports discoveryreports17inst Year: 1938 294 DISCOVERY REPORTS that descriptions of the adult are so often inadequate in substance if not in length, and many pages of painful detail may contain no reference to the gill formula which is of such fundamental importance. For example, the two genera Laomedia and CalHamdea have been known for about a century, but I have found no full statement of the gill formula of either. When one's efforts to find the systematic position of a larva fail, it is some comfort to discover that the highest authorities on the syste
Discovery reports (1938) Discovery reports discoveryreports17inst Year: 1938 294 DISCOVERY REPORTS that descriptions of the adult are so often inadequate in substance if not in length, and many pages of painful detail may contain no reference to the gill formula which is of such fundamental importance. For example, the two genera Laomedia and CalHamdea have been known for about a century, but I have found no full statement of the gill formula of either. When one's efforts to find the systematic position of a larva fail, it is some comfort to discover that the highest authorities on the systematics of the aduhs are sometimes equally at a loss. For instance, Metaxius Bouvier, which may be a synonym of Meticonaxins De Man, was referred to the Axiidae by De Man in 1925 and to the Callianassidae in 1928, while Callianassa coeca Balss is regarded by De Man as a synonym of Meticonaxiiis monodon De Man. I have thought it well to include in this report two remarkable forms which may be said to contribute evidence of the relationship of Axiidae to Nephropsidea. One of them is referred provisionally to Nephrops, while the other is a post-larval stage of Enoplometopus, a genus which is now regarded as an Axiid, but has previously been included in the Nephropsidae. NEPHROPSIDEA Nephrops (Figs. 1-2) Barrier Reef St. 7. Length 4-8 mm. Rostrum long, triangular in section, with ventral ridge and lateral margins serrated. Carapace with dorsal ridge in front, pointed anterior angle, but no other spines. Ab- Fig. I. Nephrops sp. ? dominal somites 2-5 without dorsal spines, but with sharply pointed pleural spines. Somite 6 not separated from telson, longer than rest of abdomen. Telson triangular, According to De Man (1928, p. 30) Metaxius has epipods on legs 1-4, and he includes it in his new subfamily Callianideinae.
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