248 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 



Four excellently preserved examples with expanded gills in 

 tubes and measuring (type) 10 mm. long, of which the gills are 3.2 

 mm. to 14 mm. long, gills 4.5 mm. 



Station 4431 only, off Santa Cruz Island, 38-45 fathoms, mud 

 and coarse gray sand. 



SERPULIDAE 



Protula atypha Bush. 



Two specimens having fifty-two pairs of branchial radioles. A 

 tube is 70 mm. long, 5 mm. in external diameter at the large and 

 3 mm. at the small end, regularly tapered, terete throughout and 

 somewhat roughened externally by irregular transverse growth 

 lines, polished internally, slightly tortuous, erect, unattached, 

 Station 4431, as above. Small portions of Protula tubes, possibly 

 of this species, taken at stations 4420 and 4421 also, 



Apomatus geniculata Moore. 



Three examples were taken at as many stations. (3ne of these 

 has the operculum as on the type. Another has no fully-developed 

 operculum, the larger one on the right side about twice diameter 

 of its radiole, which is about three-fifths as long as the longest 

 radiole and bears barbs as far as the short constriction preceding 

 the operculum. That on the left side is minute and borne on the 

 end of a radiole that is but one-fourth the length of the next one 

 and appears to have been broken and regenerated. Tubes are from 

 55 to 100 mm. long with an orifieal diameter of about 5 mm., gen- 

 erally terete, but attached to stones by a flattened side, the basal 

 part more or less coiled and sometimes coherent, the terminal 

 part erect, thickwalled, stony, white, marked by fine tranverse 

 line. 



Stations 4410, off Santa Catalina Island, 178-195 mm., gray 

 sand; 4431, off Santa Rosa Island, 38-45 fathoms, mud and sand; 

 4463, off Point Pinos Lighthouse, 48-111 fathoms, rocky. 



Spirabranchus spinosus sp. nov. Plate XVIII, fig. 47. 



Gills arise in a spiral coil of about three turns, about forty-five 

 pairs, very much crowded and packed together, making a detailed 

 description impossible, the short radioles strongly compressed, 

 with a slender free tip, the basal two-fifths connected by a mem- 

 brane and bearing numerous short delicate crowded barbs. 



Operculum (left side) large and conspicuous, lying entirely distad 

 of the gills; the stalk slightly depressed, gradually widening to 



