On Two New Polynoids From Laguna 



W. F. Hamilton 



Halosydna siicciniseta, n. sp. 



Form attentuated posteriorly, like H. lordi, which form this 

 closely resembles. Greatest width about somite 12, whence it 

 tapers gradually to the slender hind end. 



Proboscis (Fig. 3) large and strong. It is 4 mm. long and 

 2.7 mm. wide, cylindroid and slightly flattened distally. Papillae, 

 9/9, irregularly conical. Jaws of clear yellowish chitin with large, 

 sharp fangs of dark brown chitin, the lower biting to the right. 

 There is a prominent tubercle, .5 mm., from the ends of each series 

 of papillae, and an irregular fold of cuticle surrounding the probos- 

 cis near the middle. 



The prostom'mm (Fig. 3), decidedly wider than long, is full 

 and rounded, either cheek being almost spherical. Eyes four, the 

 anterior pair are a little larger than, and twice as far apart as the 

 posterior. The tentacle, inserted about one-third the length of the 

 basal segment into the front edge of the prostomium, is slightly 

 longer than the prostomium is wide. Basal segments of the an- 

 tennae are produced from the lateral lobes of the prostomium, but 

 cut off from them by a well marked suture. They are nearly as long 

 as the tentacle and all three are produced into long filamentous 

 tips. Palpi, thick, fleshy, tapered, finely papillose and ringed near 

 the tip with dark brown. Tips produced to a hair-like point. 



First parapodiuvi achaetous and directed forward at the side of 

 the prostomium. Ventral cirrus conforming to the dorsal type. 



Second parapodium with both dorsal and ventral setas, Noto- 

 podium slender, with few dorsal setae growing out half way be- 

 tween the base and the tip. Neuropodium fleshy, bilobed and long. 

 Ventral cirrus like that on the first foot. 



Third parapodium nearly typical. Notopodium half as long as 

 neuropodium, three dorsal setae, neuropodium thicker and longer, 

 ventral cirrus smaller than on second foot. 



Typical parapodium (Fig. 2). Notopodium, achaetous, slen- 

 der, rounded at tip and about half as long as neuropodium. Acic- 



