218 AET. II. A. IZUKA : 



Eyes absent. Tentacles very short, being about J the length of 

 prostominm. 



Parapodium short ; both dorsal and ventral rami about 

 equally developed ; the latter simple, truncate, conical, with slight 

 acicular lobe and circumsetal collar, but without distinct lamellae ; 

 cirrus very short, thick, conical. Dorsal ramus also simple, 

 short, truncate, conical, without lamellas ; acicular lobe well- 

 marked and notched at end ; circumsetal collar oblique, its pos- 

 terior region high, the anterior very low. No dorsal cirrus, but a 

 short special cirrus present on ventral side of dorsal ramus, closely 

 connected with the external side of the base of branchial stem. 

 Branchia a large wrinkled leaf-like structure, with a thick taper- 

 ing midrib running through middle. A single, slightly brown- 

 ish, stout acicula supports eacli ramus. None of the bristles 

 were complete in Mooee's specimen. 



Habitat ; — Sagami Bay, 175-190 fathoms (" Albatross "). 



Family Amphinomidae. 



Body oval, oblong or elongate. Prostominm very small, 

 rounded or compressed. A median and two lateral tentacles pre- 

 sent, the latter sometimes wanting ; an elongate dorsal caruncle 

 and four eyes present ; subtentacles two or none. Mouth-opening 

 ventral, surrounded by several similar segments ; proboscis pro- 

 trusible, devoid of jaws. Dorsal cirri one or two ; ventral cirrus 

 one or none. Branchiae well developed, dorsal or marginal in 

 position, pinnate, arborescent or filiform. Anus dorsal. Posterior 

 appendages two. 



