Polychaeta 19 B 



the notopodial lamellae above the tips of which they do not rise and by which 

 they are largely concealed. 



As usual, only capillary setae are found in both branches of the anterior 

 parapodia. In both notopodia and neuropodia they are very numerous and 

 are arranged in the usual two series. Crochets first appear on or near the 

 eleventh parapodia, one or two in each, increasing in number caudad. The 

 ordinary capillary setae are characterized by being densely and coarsely punc- 

 tate, the punctae in part elongate or in form of short lines. The crochets are 

 hooded, the membranous shields somewhat clavately widening distad and 

 extending completely over the head. The head is large and extends at right 

 angles to the axis of the adjacent part of the shaft; it lacks an apical denticle 

 and the process is cleft somewhat like the beak of a bird. (See PL IV, fig. 4.) 



Locality. Unfortunately the locality label with the type, after its separa- 

 tion, was displaced. There seems little doubt, however, that it was from 

 Collinson point, Alaska, probably from Station 27o. 



LARVAL SPIONID A. 



Two larvae of this form were secured in plankton among the more numerous 

 phyllodocid larvae (Paranaitis sp.). These are Nerine-like forms. The prosto- 

 mium is anteriorly pointed, the point less prolonged and less acute than in 

 corresponding stages of Nerine cirratulus. Two pairs of eyes are present. Palpi 

 well-developed, thick. In one specimen twenty setigerous segments are present. 

 The development of the parapodial lamellae has progressed considerably, the 

 postsetal notopodial lamellae on the anterior segments showing already a distal 

 elongation. Capillary setae alone are present on the first thirteen pairs of para- 

 podia. On the fourteenth hooded crochets appear in the neuropodia and con- 

 tinue to the last, the maximum number attained being three. (See pi. IV, 

 fig. 6.) No crochets were detected in any qf the notopodia. Length 1.5mm. 

 The general form and structure of the specimen is shown in PI. IV, fig. 5. 



The second specimen is of nearly the same length, but is proportionately 

 more slender and presents twenty-four or twenty-five setigerous segments. It 

 is otherwise similar in general form and structure to the other specimen. 



LOCALITY. Alaska: Grantley harbour. Station 20a. July 30, 1913. 

 Surface. 



LARVAL SPIONID B. 



With the field notes made by the marine zoologist of the expedition (Mr. 

 Johansen) are two sketches of larvae which are obviously spionids. Specimens 

 of these forms, however, were not in the material submitted for study, so that 

 various desirable details cannot be ascertained with reference to them. 



(a) The first sketch represents a spionid, noted as less than 1 mm. in 

 length, in which both anterior and preanal ciliary rings are present. There are 

 fourteen setigerous segments. The palpi are subconical, distally rounded 

 organs and project caudoectad. Across the anterior end of the prostomium 

 are shown eight eyes, of which three on each side form a triangular group. The 

 prostomium is anteriorly slightly indented, not at all pointed. 



LOCALITY. Dolphin and Union strait (off Bernard harbour). Station 40c. 

 June 7, 1915. Pelagic. Ice 6 feet, over 9 feet of water. 



(6) The second sketch is of an apparently older larva about 2 mm. long. 

 It is similar in general appearance to the preceding. Nineteen setigerous somites 

 are represented. Both anterior and preanal ciliary bands represented as still 

 present. Prostomium and palpi similar to those of (a). Only four eyes, two 

 of each outer group of the preceding form being absent. The sketch also 

 represents the eyes as farther caudad than in the other form, being shown, 

 in fact, as just behind the ciliary band instead of in front of it. 



LOCALITY. Alaska: off Martin point. Station 32c. July 30, 1914. 



719272^ 



