TKKKKKI.I.ll OKM1A. 



48f> 



T 



Fain. 1. Cirratulidae. Cylindrical body pointed at both ends. Prestomiuni 

 elongated, conical, without tentacles, or with two tentacles, (tentacular cirri, 

 Grube). Parapodia small, with simple setae. On some of the segments the 

 dorsal cirri are long and lilaiut'iilous, and function as gills. A single pair of 

 anterior nephridia ; tin- septa and genital ducts are repeated through the hinder 

 part oft lie body. Inhabit bin rows. Cirratuhis Lain. ; Audouinia QfgT; Chaeto- 

 BMM Mulmg.; ])od<\'accnu-<i (Dodccaccritt) Oerst. ; Hekaterobranchias V. Buchanan. 

 Fain. 2. Terebellidae. Body vermiform and thicker anteriorly. The 

 thinner posterior por- 

 tion is sometimes dis- 

 tinctly marked off as 

 an appendage devoid of 

 setae. The prestouiium, 

 \\liich is indistinctly 

 separated from the 

 peristominm, forms an 

 upper lip and carries 

 numerous filiform ten- 

 tacles arranged in a 

 transverse ro\v ; it may 

 have four eye spots. 

 There are pectinate or 

 1'ianclied, rarely fila- 

 mentous, gills on one 

 to three of the an- 

 terior segments ; they 

 contain a prolonga- 

 tion of the eoelom. 

 Dorsal prominences 

 (notopodia) with. simple 

 setae, and ventral 

 transverse ridges (neil- 

 ro podia) with hooked 

 setae. One to three 

 pairs of large nephridia. 

 From three to twelve 

 pairs of small nephridia. 

 (gen. ducts) behind the 

 diaphragm. Tubi- 



rolous, tube formed of 

 foreign bodies. 



Sub-tarn. 1. Amphitritinae. Almost always with gills ; cephalic lobe 

 short, with numerous tentacles. AmphitrUe 0. F. Midi., simple setae in 

 anterior region only, 3 pairs of gills of nearly the same size, no eyes ; 

 A. Johnston i Mlmg. TcrelcUn L. (Fig. ;W(>), distinguished by the small 

 si/e of the posterior of the three pairs of branchiae ; '/'. (Lt nice) conchilega 

 Pall., Knglish coast; A'iculea Mlmg., two pairs of equal gills; Hclcro- 

 tcrebrtlu (.){(.; Thelcfnin Lei-ick. (ind. JIrt,'roj>h<'>itn'ia Qt.f., Phenacia Qtf., 

 Ncottis Mlmg., etc.), liliforin gills in two segments; Entli<-t<in(x Mclnt. ; 

 Leacna Mlmg.; Lanassa Mlmg.; Loiinia Mlmg.; J'tstti Mlmg.; Nicolea 

 -Mlmg. 



Fio. 390. Terebdla ncbvlosa opened from tho dorsal side (aftor 

 M. Edwards). T tentacles ; A" Kills ; Dg dorsal vessel or heart. 



