230 



AEÏ. II. — A. IZUKA 



Prostomiiim small ; siibtentacles short and conical ; lateral 

 tentacles situated just dorsal to, and a little longer than 

 subtentacles. Median tentacle attached in a 

 groove at the anterior end of caruncle, J as 

 long as lateral tentacle ; it is, like the others 

 a simple subulate process. 



Caruncle large and rugose, consisting of an 

 elevated, doubly crenate crest and a wrinkled 

 horizontal portion ; the middle of the crest 

 marked with a longitudinal series of small 

 elevations. The organ is fixed to the first 4 

 parapodiated segments, and extends posteriorly 

 to the commencement of the 6th, terminating 

 with free extremity. 



Anterior pair of eyes situated in the line 

 passing just through front of the anterior border 

 of caruncle; and posterior pair of eyes, which Boisai y-iew ot Xotopygos 



be smaller than those or the anterior, 3 .^ ^^^^ ^..^^ 



situated a short distance behind these and on 

 sides of the caruncle. 



Mouth opens at the inferior anterior border of the 4th para- 

 podiated segment ; from the oral aperture two very prominent 

 longitudinal folds run forwards to the anterior end of snout, where 

 they unite to form the anterior lip. 



Brand li^G commence to occur on the 5th parapodiated seg- 

 ment, and are situated close to the inner or dorsal side of dorsal 

 bristle -papilla. Tliey continue to exist posteriorly to the end of 

 body, without decreasing in size. Each branchia has the form 

 of a short arbuscle and consists of 5 or 6, nearly equally long, 

 main stems springing from common base, which stems branch 



