SABELLIDS. 221 



M. Sars 1 (1868) included Chone infundibuliformis and Euchone sp. ? amongst those 

 found at a depth of 250 — 300 fathoms. 



Reproduction. — Miss Gregory observes that examples of Sabella microphthalmos are 

 pure females in April and May, but that in August they are hermaphrodite or female. 



Benham 3 follows Pruvot and Mayer in regarding the branchial apparatus of the 

 Sabellids and Serpulids as " greatly subdivided and enormously elongated palps." The 

 coelom enters the cephalic appendages in both. 



Fuchs 3 (1907) included the Sabellidse under the Serpulimorpha, with a biregional 

 body consisting of thorax and abdomen. The anterior region has a pair of excretory 

 organs ending in a single aperture, the genital organs in the posterior region being in 

 pairs. 



It is sometimes difficult to get the Sabellids to leave their tubes, into which they 

 retreat on the slightest alarm. Mr. Crossland, however, mentions that a very common 

 small form in the Red Sea readily leaves its tube, crawls on the side of the vessel, and 

 makes a new tube of secretion in a short time. Bohn again characterises their swimming 

 movements as " natation helicoidale oscillatoire." 



Orton 4 (1914) observed that Dasi/chone and others attained a good size in much less 

 than a year. 



One member of the Sabellids, viz. Spirograpliis spallanmni, has been found by Dr. 

 Gaskell 5 to have no nerve-cells giving the chromaffine reaction — which he had detected in 

 Aphrodita aculeata and Eunice gigantea. So far as his observations go the chromafine 

 reaction is not common in the Polychseta. 



The British Sabellids number more than twenty, exclusive of some forms not yet 

 fully investigated from lack of good material. In this respect, therefore, they compare 

 favourably with those from othea areas. Thus, for example, Sars G in 1861 gave ten 

 species of Sabellids, including one of Myxicola, as occurring in the prolific Norwegian 

 waters. De Quatrefages in his 'Anneles' mentions about a dozen of the forms which have 

 been found in Britain, including double entries like Sabella penicillus and 8. imvonina, 

 Sabella reniformis and S. saxicava, Fabricia amphicora and F. Johnstoni. In Malmgren's 

 'Annulata Polychasta ' of Spitzbergen, Greenland, Iceland and Scandinavia nineteen 

 Sabellids (including Myxicola) are entered, and some of these appear to be purely 

 northern in distribution, and do not occur in our waters. Only six are entered by Dr. 

 Johnston in the ' Catalogue of Worms in the British Museum,' and two of these represent 

 one species, Sabella penicilhis, and another, S. savignii, is doubtful. 



Six species, including Myxicola Steenstrupi, are recorded by Theel 7 (1879) from 

 Nova Zembla. 



Langerhans (1880) found ten species at Madeira. 



i <■ 



2 <■ 



3 i 



4 ' 



5 ( 



6 c 



7 < 



Vidensk.-Selsk. Forhandl./ 1868 (sep. copy), p. 10. 



Camb. Nat, Hist./ 1896, pp. 260 and 261. 



Jeua. Zeitschr. f. Naturw,/ Bd. xlii, 1907. 



Journ. M. B. A./ vol. x, p. 316. 



Philos. Trans./ ser. B., vol. 205, p. 157 (1914). 



Forhandl. Yidenskabs-Selsk. Christiania/ 1861, pp. 116—131 



Kongl. Sv. Vet. Akad. Hand]./ Bd. xvi, No. 3, p. 65. 



