SABELLIDiE. 215 



Steen 1 (1883), in his account of the structure of the species, designates the thoracic 



.glands as salivary glands. The segmental organs are situated in the fifth and sixth 



segments, a pair in each, and the funnel opens into the body-cavity in the middle of the 



segment, projecting, no t through a diaphragm, but according to his interpretation % 



standing at right angles to the body-wall. 



Parasites. — Levinseir describes a crustacean parasite (Saccopsis terebellidls) of this 

 species from Greenland, the body of the female of which is somewhat pear-shaped and 

 without apparent segmentation. Behind the eighth bristle tuft on the right a reddish- 

 brown mass with processes passing internally occurred in a large example from Berehaven, 

 Ireland. It is probably one of the Rhizocephala. 



M. Sars 3 (1861) described a parasitic female Copepod which he termed Terebellicola 

 reptans in this species. The body is pear-shaped, the broad end being in front, with 

 eleven segments. The head is joined to the first thoracic segment, and has a rostrum. 

 Maxillipedes and five pairs of feet are present, the fifth, however, being rudimentary 

 (biarticulate) . 



Wiren (1886) gives an account of a Lumbrinereid commensal, Hamiatocleptes tere- 

 bellidis, living in the oesophagus of this species. 



Cunningham and Eamage (1888) mention that there is but one pair of nephridia in 

 the first bristled segment. 



The sub-family Canephoridea of Malmgren contains Grube's genus Canephorus, 

 which seems to be closely allied to Terebellides, having twenty anterior segments and 

 thirty-two posterior. Branchiae sinuous quadrilobate (arising from segment 2), and on a 

 short basal process. Colour greyish, a little iridescent. 



Family XXX. — Sabellilve. 



The body is somewhat rounded or slightly flattened, of two regions, an anterior 

 (often called the thoracic) embracing from five to twelve segments with bristles of two 

 kinds, and hooks of two kinds in a double row, either long or short, and a posterior 

 (so-called abdominal) region of numerous segments. The ventral longitudinal sulcus is 

 continued on the dorsum anteriorly. The bristles and hooks of the posterior region are 

 each of one type. 



The first segment has a collar more or less adpressed to the branchiae. Branchiae 

 forming a funnel surrounding the mouth by the apposition of the fan on each side, the 

 rays having only pinnae internally in Sabellids proper, and externally occasionally 

 processes arranged in pairs, and eyes in other forms. A pair of muciparous glands 

 (modified segmental organs) opening by a single orifice anteriorly. Posteriorly 



1 ' Jenaisclie Zeitsclir. f. Nat./ Bd. xvi, p. 232, Taf. xi— xiii. 



2 'Videnskab. Meddel. Naturlnst. For. KjVbenhavn/ p. 24, Tab. vi, figs. 21—22, 1877. 

 * ' Forhandl. Vid.-selsk. Christ./ 1861, p. 139. 



