214 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 



fortunately all are badly macerated. Most of them have the 

 posterior abdominal region strongly coiled. A straight one (not 

 one of the largest) is 96 mm. long and exactly 5 mm. in greatest 

 width. Segments 61, 17 thoracic setigerous. Except that Mc- 

 intosh's figure shows a considerable interval between the two 

 antero-medial ones the gills agree fully with his description. The 

 post-branchial or nuchal fold is relatively less extensive and usually 

 has seventeen (sometimes only fifteen or sixteen) teeth, instead of 

 eighteen as figured by Mcintosh. The lateral wings on segments 

 II, III and IV are thick and prominent with the anterior borders 

 nearly vertical and the dorsal margins abutting on the gills. Uncini 

 have exactly the form figured by Mcintosh. A careful search 

 failed to discover any nuchal spines. Many contain ova or sperm. 



Tubes are very large, 7-8 mm. in diameter and 400 mm. in 

 length and constructed of heavy mud walls. 



Stations 4390, off Santa Catalina Islands, 33° 02' 15" N., 120° 

 42' W., 1350-2182 fathoms, gray mud and fine sand; 4436, off 

 San Miguel Island, 264-271 fathoms, green mud. 



Samytha sexcirrata Sais.? 



A single specimen is referred somewhat doubtfully to Sars ' species. 

 It agrees closely with an example from Labrador and differs distinct- 

 ly from S. bioculata. 



Length 19 mm. of which the abdomen is 6.5 mm. Greatest width 

 at XI about 3.5 mm. Form generally clavate, slightly depressed, 

 moderately stout. Thoracic somites twenty, of which seventeen 

 are setigerous, abdominal fifteen. The gills have been lost but the 

 three pairs of flattened scars are very dictinct; the anterior lateral 

 and the middle pairs being borne on IV, the posterior medial on 

 V, the missing pair of those present in Amage, etc., apparently 

 being the most posterior on VI. 



Thoracic uncini bear five large teeth in one series and alternating 

 with these smaller teeth in a second imperfect series. The Labrador 

 specimen has the second series of teeth usually complete. Abdomi- 

 nal uncini are smaller than the thoracic with the teeth in two 

 complete series of five and four or four and four placed alternately. 

 S. bioculata has a single series of usually four teeth on both thoracic 

 and abdominal uncini. 



Station 4464, off Point Pinos Lighthouse, 52-59 fathoms, green 



mud. 



