46 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



Genus HYALINOEGIA Malmgren 

 Type H. tubicola (Miiller) 



Hyalinoecia is characterized in lacking peristomial cirri and in having 

 usually simple, cirriform branchiae; anterior parapodia are provided with 

 falcate (usually also dentate) hooded hooks, with or without articulation; 

 other setae include (1) simple limbate, (2) pectinate, and (3) bidentate 

 hooded, subacicular ones; their distribution resembles that in Onuphis 

 (p. 66). The tube is typically horny, translucent, in life freely carried 

 about by the occupant. Most species are known only from deep water 

 (over several hundred fathoms). 



Eight species have been described from the Western Hemisphere, all 

 save one, H. juvenalis Moore, in depths of 300 fms or over. These are : 



1. H. branchiata Treadwell (1934, p. 6) from Puerto Rico, in 300 fms. 



2. H. juvenalis Moore (1911, p. 277) from Santa Rosa Island, Cali- 

 fornia, in 38-45 fms. 



3. H. leucacra Chamberlin (1919, p. 277) from western Mexico, in 

 660 fms. 



4. H. solenotecton (Chamberlin) (1919, p. 306) from Pacific Panama, 

 in 1,270 fms. 



5. H. tecton Chamberlin (1919, p. 310) from western Mexico, in 679 

 fms. 



6. H. tubicola (Miiller) first described from Norway, since reported 

 from cosmopolitan areas. From the Western Hemisphere it has been 

 described as H. tubifex Verrill (1880, p. 357) off northeast America, 

 and as Onuphis (Paronuphis) gracilis Ehlers (1887, p. 78) off 

 Florida. 



7. H. tubicola stricta Moore (1911, p. 280) from southern California, 

 in 1,059 fms. 



8. H. varians Baird (1870, p. 359) from the West Indies. 



Only one species, H. juvenalis, but this in abundance, has been found 

 in the collections of the Allan Hancock Foundation, but the operations of 

 the Velero III have not included the great depths at which the other spe- 

 cies typically occur. 



Hyalinoecia juvenalis Moore 



Moore, 1911, pp. 277-280, pi. 18, figs. 86-95 ; Treadwell, 1937, p. 152. 



Collections.— 2AA-3A (1); 448-35 (1); 461-35 (9); 523-36 (3); 

 541-36 (4) ; 544-36 (8) ; 546-36 (about 20) ; 701-37 (1) ; 863-38 (1) ; 

 873-38 (1) ; 878-38 (1) ; 936-39 (about 15) ; 990-39 (about 20) ; 1037- 

 40 (about 20); 1081-40 (1); 1128-40 (3); 1130-40 (10); 1131-40 



