Discovery reports (1929) Discovery reports discoveryreports21931inst Year: 1929 196 DISCOVERY REPORTS separated throughout in the mid-ventral Hne. There are six pairs of nephridia, extending from the 3rd to the 8th segment. As in P. calieridrum they decrease in size from the first to the third pairs: the remainder are of equal size and smaller than the 3rd pair. There are several ripe females among the specimens, and these have rounded glandular orifices below the bristles in the 6th, 7th and 8th segments. 0- o OZrxxrw O a Fig. 81. Poly cirrus hesslei. a. Ventral view of anterior end. The
Discovery reports (1929) Discovery reports discoveryreports21931inst Year: 1929 196 DISCOVERY REPORTS separated throughout in the mid-ventral Hne. There are six pairs of nephridia, extending from the 3rd to the 8th segment. As in P. calieridrum they decrease in size from the first to the third pairs: the remainder are of equal size and smaller than the 3rd pair. There are several ripe females among the specimens, and these have rounded glandular orifices below the bristles in the 6th, 7th and 8th segments. 0- o OZrxxrw O a Fig. 81. Poly cirrus hesslei. a. Ventral view of anterior end. The tentacles have been pushed back to show the cephaHc lobe. b. Dorsal bristle, c. Hooks. The bristles begin on the 2nd segment and there are 13 notopods with cirriform processes. The uncini begin at the 14th chaetiger. The dorsal bristles (Fig. 81, b) are long and slender and very thinly bordered. Under a one-twelfth objective, they appear to have finely hirsute edges, which I hesitate to describe as a true denticulation. The abdominal hooks (Fig. 81, c) have above the main fang a single tooth surmounted by a row of about six denticles. The intestine is filled with sand. Remarks. This form is clearly separated from P. kergiielensis by the character of its dorsal bristles: it is nearer to Gravier's P. insignis, but differs from it in a number of
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