760 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Family Loxosomatidae Hincks, 1880 



The individuals are not colonial but live singly, attached to some other 

 animal by a muscular sucking disc at the base of the stalk. They are 

 unchitinized, flexible and capable of bending in any direction, and some 

 of them, at least, are capable of moving about and re-attaching them- 

 selves. They produce buds from the sides of the calyx, but these sever 

 their connections when their growth is complete and live singly there- 

 after. They are all small, some of them microscopic in size. There are 

 two genera, Loxosoma Keferstein and Loxocalyx Mortensen, depending 

 on whether the foot-gland disappears after attachment or remains func- 

 tional. 



Genus LOXOSOMA Keferstein, 1863 



Loxosoma davenporti Nickerson, 1898 



Loxosoma Davenporiii Nickerson, 1898:220. 

 Loxosoma Davenporti Nickerson, 1899:368. 

 Loxosoma davenporti Nickerson, 1901:351. 

 Loxosoma davenporti, Osburn, 1912:212. 



This species has been noted only once on the Pacific coast, by 

 O'Donoghue at low tide in Hammond Bay Lagoon, British Columbia. 

 It is a commensal in worm tubes. 



The entire animal is about 2 mm long, somewhat vase-shaped, the 

 pedicel cylindrical and about as long as the calyx into which it merges 

 gradually; foot-gland wanting in the adult; lophophore with 18 to 30 

 tentacles, the body somewhat narrowed below the lophophore ; usually 

 with a pair of flask-shaped glandular organs on the ventral side of the 

 body near the lower end of the stomach. The species was originally ob- 

 tained by Nickerson and later by Osburn in the Woods Hole region, 

 Massachusetts. 



? Loxosoma sp. 



A small species which was epizoic on an annelid worm at Point Bar- 

 row, Alaska, and on account of the preservation is unidentifiable even 

 to the genus. The calyx expands gradually from the pedicel upward; 

 width of calyx at the upper end 0.18 to 0.22 mm, height 0.33 to 0.40 

 mm, length of pedicel about 0.40 mm. Apparently there is no foot gland, 

 and the tentacles cannot be counted. 



