1917] Essenherg: New Species of Amphinomidae 63 



The members of the family Amphinomidae are confined mostly to 

 tropical and subtropical waters, but a few species of Eurithoe have 

 been reported from the lower boreal regions, and some species of 

 Euphrosynina have been found in the temperate zones. 



The species in the collection of the Zoological Museum of the 

 University of California are from the waters of the coasts of Cali- 

 fornia, except two specimens, of which one is from the Hawaiian 

 waters, the other one from the sub-boreal waters. The Amphinomidae 

 have a varied bathymetrical distribution, ranging from the littoral 

 zones to depths of 2000 fathoms. They have been found on the sur- 

 face of the water attached to buoyant substances such as logs or 

 weeds. They are frequently found on kelp between tide-marks. 

 Some of the species live as commensals on sponges and are noted for 

 their remarkable adaptive coloration (Mcintosh, 1900). 



DESCRIPTION OF NEW SPECIES 



The species of Amphinomidae of the University collection have 

 been enumerated by Tread well (1914). On the following pages the 

 following new species are described which may be added to his list: 

 Euphrosyne calypta, Euphrosyne miUtihranchiata, Eurythoe spiro- 

 cirrata, and Euphrosyne kyllosetosa. 



To the list of the Amphinomidae in the annelid collection of the 

 University of California may also be added Chloeia pinnatq (Moore), 

 of which fourteen specimens were found in the Survey of San Fran- 

 cisco Bay on October 21, 1912, at Station D5788, near Farallone, 

 lat. 11° 30' N., at a depth of 68 to 60 fathoms, in very fine green sand. 



1. Euphrosjme calypta sp. nov. 



PI. 4, figs. 1-3, 6-7, 13-14 



Diagnosis. — Body elongated, rounded at both ends. Dorsum 

 slightly arched with segmentations definitely marked on dorsal and 

 ventral surfaces. Caruncle bilobed, extending to the fourth segment. 

 Six pairs of three- to four-lobed branchiae. Dorsal cirrus between 

 second and third gill-trunks. 



Description. — The species is comparatively small in size. The two 

 specimens, type and paratype, measure 10 and 11 mm. in length, 

 respectively, and 6 mm. in width. The body is ovate-oblong, uniform 

 in width, rounded at both ends. The slightly arched dorsum is covered 



