JOURNAL OF ENTOMOLOGY AND ZOOLOGY 235 



ula, light brown and slightly curved backwards at tip. Notopo- 

 dium thick, truncate, bi-lobed, five setae on nearly every foot, 

 arranged directly underneath one another. Neurocirrus short, 

 globose, produced to a fine filamentous tip. 



Dorsal sctce (Fig. 1) with notch at tip, serrated on the convex 

 side for a distance equal to twice the width of the spine. As much 

 farther down the concave side is a collar partly surrounding the 

 seta, which then tapers slightly along the shank to the base. These 

 sets are embedded all but their tips in the flesh of the foot. 



Ventral seta (Fig. 4) are very large, strong and sharp, with a 

 few very minute serrations directly under the hook. The chitin is 

 very light in color and almost perfectly transparent. There is 

 almost no fibrous structure in the core of the spine, and this does 

 not extend to the tip. 



Dorsum entirely covered with elytra of a dead gray color, which 

 have a single brown spot just above the elytrophore. The surface 

 is otherwise immaculate. They are non-ciliate, reniform, and born 

 on somites 2, 4, 5, 7, — . 



The species is described from an example taken July 9, 1915. 

 The figures were made from an example taken the year before 

 which differs from the typical in having the left eyes fused into 

 one. This anomaly is the first one of its kind I have seen. The 

 pigmentation is scattered in small granules over an area correspond- 

 ing to that occupied by the eyes on the opposite side. 



H. succiniseta belongs to the type of commensal polynoids, but 

 has itself never been found living with another animal. 



The chief reason for calling this a new species is the collar on 



the dorsal seta. . 



Halosydna laguna n. sp. lUu^--^^--^^^ 



General aspect like H. insignis. Form, oblong-linear, tapering 

 gradually and about equally at both ends. Somites, 26; elytra, 12 

 pairs on somites 2, 4, 5, 7, — 21, 25. 



Proboscis (fig. 8), constricted in the middle, bulging at base, and 

 flaring at the end, 5 mm. long and 2.7 mm. wide. Papillae, blunt, 

 conical, arranged 9/9. Jaws of dark brown chitin, produced into 

 a sharp knife edge. Fangs blunt with three prominent ridges on 

 outside face, lower pair biting to the right. 



