Gatty Marine Laboratory, St. Andrews. 169 



after gradually tapering to a long filament or tendon moved 

 by a muscular process. The vast number of these organs on 

 a torus of the middle region of the body with their tendons 

 and muscular apparatus gives an idea of the complexity of 

 the arrangements for fixing the animal to the lining of its 

 tube. Further investigation of this form is necessary, though 

 it may be a variety of the foregoing. 



A Myriuchelf. was fouud at St. Andrews in the stomach 

 of the haddock in 1864 by E. M., invested by a sandy tube. 

 So far as can be observed in the fragmentary specimens, the 

 arrangement of the bristles and the structure of the bifid 

 hooks is identical. The size of the bifid hooks is somewhat 

 larger than in the Canadian form described in the preceding 

 note. 



4. On the British Hermellidse. 



In the 'Catalogue of the British Museum' by Dr. Johnston, 

 three species are described under the Family Sabellariadse, 

 but two of these, viz., Sabellaria anglica and &. crassissima 

 really pertain to the same form, S. alveolata, L., and the third 

 is S. spinulosa of Leuckart, under the name of S. lumbricalis. 

 The family is a small one, only two species being entered, for 

 instance, by Malmgren in his northern list, and the same 

 number characterized the British seas until Dr. Allen * 

 recently added to science the interesting Pallasia murata of 

 the southern waters. English estuaries have masses of the 

 sandy tubes of S. alveolata, whilst between tide-marks on 

 Scottish coasts A. spinulosa forms dense groups of tubes on 

 stones and rocks. 



The cephalic region in Sabellaria spinulosa is divided 

 dorsally into two great lateral lobes bearing the paleae on 

 pillars, the dorsal edge of the mouth being in the centre, 

 whilst the lips slope obliquely backward ventrally; the two 

 lobes, which appear to be homologous with the operculum of 

 the Serpulidas, can be widely separated ventrally, where they 

 merge into the mouth and its tentacles. Each lobe forms 

 a semicircle which by apposition with its neighbour consti- 

 tutes the opercular crown on the dorsal arch of the mouth, 

 and between the tentacles is a tongue-shaped fold or process 

 — richly ciliated. 



The external series of golden palese which form a fringe 

 to the crown are about twenty-five in number; the typical 

 paleae having a shaft, which tapers from the junction of the 

 tip to the pointed base. The tip forms a broad, flattened, 



* Journ. M. B. A. vol. vii. p. 299, pi. x. 

 Ann. & May. N. Hut. Ser. 8. Vol. xii. 12 



