5 Two diverging glandular ridges on prostomium 6 



5' No glandular ridges on prostomium. [Twelve uncinigerous 



thoracic segments] 7 



6 Eleven uncinigerous thoracic segments. Small capillaries on 



segment 3 Amagr auricidu 



6' Fourteen uncinigerous thoracic segments. Large paleae on 



segments. [Notopodia with papilliform dorsal cirri] Ampliictcis (juiineri 



7 Large paleae on segment 3 Ainparctc (iciitifnnis 



T Either small capillaries or no .setae on .segment 3 8 



8 Innermost gill of each group much shorter than others; a wide 



median gap between the two groups of gills. Thoracic uncini 



with two rows of three teeth Ampliarctc parvidoitata 



8' Gills not very different in length; median gap between groups 

 of gills not obvious. Thoracic uncini with two rows of five 

 teeth Aitiphantr anicriccDHt 



Melinnopsis atlantica Mcintosh. 1885 



Meliiniopsisiitlaiiticu Mcintosh, 1885: 441, 27A: 

 Fig. 18. 



Syntypes. — Three fragmentary syntypes from 

 3,110 m off Chesapeake Bay; British Museum 

 Catalogue No. 1885: 12: 1:330. 



Discriptioii. — Types broken and poorly pre- 

 served thus several features uncertain. Pro- 

 stomium normal but detailed shape doubtful. 

 Buccal tentacles grooved. An oblique fleshy 

 ridge slanting up from behind mouth and form- 

 ing a dorsal crest across segment 6. Presence 

 or absence of toothed margin to dorsal crest 

 uncertain due to poor preservation. Segment 3 

 with a branchial ridge bearing two groups of 

 four gills arranged three in front and one behind. 

 Gills long smooth and tapered. Fine acicular 

 neurosetae embedded in sides of segments 3. 

 4, 5, and 6. No notosetae on segments 3 and 4 

 but small tufts of capillaries on segments 5 and 

 6. Segment 7 and subsequent thoracic seg- 

 ments with winged capillaries on notopodia and 

 single row of uncini in neuropodia. Posterior 

 end of thorax disintegrated and number of 

 uncinigerous thoracic segments uncertain al- 

 though 10 recorded in original description. 

 Thoracic notopodia and neuropodia without 

 cirriform projections. Abdomen broken and 

 number of segments now uncertain although 

 25-35 implied in original description. Unciniger- 



ous pennules. rectangular, without superior 

 papillae. Rudimentary notopodial lobes present 

 on some abdominal segments. Thoracic uncini 

 with a single vertical series of four or five teeth 

 above small rostral point and basal prow. 

 Abdominal uncini with seven or eight teeth 

 arranged in two irregvilar rows above very small 

 rostral point and basal prow. 



R('))ia)-ks. — Since the original description 

 given by Mcintosh was incomplete. Dr. David 

 George of the British Museum kindly sent me 

 the type material to check certain points. The 

 emended description given above records for 

 the first time the presence of a fleshy ridge 

 across segment 6 and acicular neurosetae on 

 the side of the same segment. Again, there may 

 have been more than the 10 uncinigerous thora- 

 cic segments mentioned in the original descrip- 

 tion. 



A fresh sjjecimen of M(li)niopsis was dredged 

 in 3,020 m at lat 36 02'30"N, long 73 5rW by 

 RV Eastward (Eastirard Station 2756, Septem- 

 ber 15, 1965). Unfortunately the specimen is now 

 missing but the following details show that it 

 was close to, if not conspecific with M. utla)itica 

 which was found further north but at the same 

 abyssal dejjth. 



The head, gills, and setation of segments 

 3-6 agree with M. atlantica but in the fresh 

 specimen it was possible to see that the dorsal 

 ridge across segment 6 was incised to form 

 16 triangular lobes. The thorax was complete 



112 



