DcKcriptioii. — Hololype 12 mm long and en- 

 cased in a friable mud tube. Prostomium ( Figure 

 15s) as a rectangular lobe above the extruded 

 buccal tentacles; no glandular ridges but two 

 pairs of eyespots. Buccal tentacles stout and 

 papillose. Branchial ridge on segment 3 well 

 developed with two groups of four gills .sepa- 

 rated by a broad median gap. All gills long and 

 cylindrical, with outer ones markedly longer 

 than inner ones. Small capillary notosetae on 

 branchial segments 3, 5 and 6. Segment 4 fused 

 to segment 3 and achaetous. No neurosetae on 

 segments 3-6. Twelve segments with well- 

 developed notosetae and uncini starting from 

 segment 7. Abdomen with 12 uncinigerous .seg- 

 ments without rudimentary notopodia but with 

 uncinigerous pinnules with well-marked super- 

 ior papillae (Figure 15p). Pygidium with one 

 pair of long anal cirri. Thoracic uncini (Figure 

 15n, o) with two vertical rows of three teeth 

 above a medial rostral point and blunt basal 

 prow. Abdominal uncini (Figure 15q, r) small, 

 with six or seven teeth in a double row. 



RcDiarks. — The shape of the prostomium in 

 the Ampharetidae varies with the opening of 

 the mouth. In the holotype, the mouth is ex- 

 panded for the extrusion of the buccal cirri and 

 the prostomium is roughly square; in many of 

 the paratypes the mouth is closed and the pros- 

 tomium is bluntly pointed in front and pinched 

 in at the sides. 



Most species of Aniplmrctt have well- 

 developed notosetae forming large paleae on 

 segment 3; here they are very small and often 

 difficult to see at the base of the outermost gill. 

 Apart from this character, the most distinctive 

 features are the broad gap between right and 

 left groups of gills and the small number of 

 teeth on the thoracic uncini; hence the specific 

 name Aiupharete parrideiitata. 



R('co)-ds. — Fairly common off Beaufort in 

 35-120 m (21, *). 



Ampharete americona New Species 



Fitiuii' l.">t-.\ 



Hdlotiipc. — USNM 43141; .seven paratypes, 

 USNM 43142 



Dcsci-iptio)/. — Body 10 mm long and encased 

 in a fragile mud tube. Prostomium (Figure 15t) 

 bluntly triangular and folded in laterally; one 

 pair of small latei'al eyespots but no glandular 

 ridges. Buccal tentacles papillose (observed on 

 a paratype). Branchial ridge well marked with 

 two groups of four long, .subequal, cirriform gills 

 narrowly separated in median line. Each group 

 of gills with three in line and one slightly pos- 

 terior in origin. A bundle of small notosetae on 

 segment 3 and bundles of slightly larger noto- 

 setae on segments 5 and 6. Segment 4 achaetous 

 and completely fused to segment 3. Twelve seg- 

 ments with well-developed notosetae and uncini 

 starting from segment 7. Abdomen with 12 un- 

 cinigerous segments without vestigial notopodia 

 and without superior papillae on the oval 

 uncinigerous tori. Thoracic notosetae as broad- 

 bladed bilimbate capillaries. Thoracic uncini 

 10 per row; individual uncini (Figure 15u, v) 

 with two vertical rows of five teeth above the 

 small median rostral point and blunt basal 

 prow. Abdominal uncini (Figure 15w, x) shorter 

 and broader than thoracic ones and with two 

 irregular rows of four teeth. 



R< ))ni)-ks. — When first examined, these small 

 specimens were thought to be juveniles until 

 it was noticed that one 10-mm specimen con- 

 tained large eggs. The most characteristic fea- 

 ture is the small size of the notosetae on seg- 

 ment 3. The lack of superior papilla on the 

 abdominal pinnules is unu.sual in ADipfinrete 

 but these structures are often small and easily 

 overlooked. 



/?( riirf/.s-. — Fifteen specimens off Beaufort 

 in 10-20 m (*). 



FAMILY TEREBELLIDAE 

 Key to genera and species 



1 Gills present on segments 2-4 



1' Gills absent from segments 2-4. [Tentacular lobe large and 

 frilly. Median ventral glandular pads reduced and ventro- 

 lateral areas of neuropodia swollen. No tube] 



13 



116 



