52 Prof. M'Intosh's Notes from the 



autei'ior hooks. Fresh investigations are necessary. Only a 

 single specimen has hitherto been obtained. 



A Myxicola from Plymouth, while agreeing generally with 

 M. infundibulum, differs in the structure of the anterior 

 hooks, for they are rather slender, with a slight enlargement 

 at the shoulder, and the distal end is curved like a shepherd's 

 crook with a sharp point (main fang). It is a question how 

 far this is due to the age and size of the specimen, but it was 

 a feature in every hook observed. It is curious that no 

 example of this genus was procured by the ' Challenger/ its 

 representatives, perhaps, being chiefly littoral or confined to 

 comparatively shallow water. 



Dr. Allen includes Myxicola eesthetica, Claparede, in the 

 fauna of Plymouth, but the distinctions indicated by the 

 Swiss author are uncertain, and he overlooked the long 

 crotchets in the anterior region of Myxicola infundibulum. 



2. On the Sabellidse dredged by H.M.S. ''Porcupine' in 1869 

 and 1870, and by H.M.S. ' Knight Errant' in 1882. 



In the ' Porcupine ' Expedition of 1869 Sabella penicillus 

 came from various parts of the west coast of Ireland, and 

 Potamilla reniformis in 90-100 fathoms on " Porcupine 

 Bank " off Ireland. In the Expeditions of 1870 Sabella jjeni- 

 cillus was dredged in 30-40 fathoms off Dingle Bay, and 

 again at Station 50, lat. 36° 14' N., long. 17° 30' 'E., in 

 7-51 fathoms, on sand and muddy sand. Sabella hystricis, 

 sp. n., was procured at No. 27 in 322 fathoms, in fine grey 

 mud, bottom-temperature 51°; Chone duneri at No. 29, in 

 227 fathoms, bottom-temperature 55°. Branchiomma kolli- 

 keri ? was brought up on the sounding-lead in 64 fathoms in 

 Setubal Bay. A fragment of a Sabella occurred 9 miles off 

 Cape Finisterre in 81 fathoms, on a hard bottom with sandy 

 mud, bottom-temperature 53° ; and another from Ras el 

 Amoud in 45 fathoms. In the ^Knight Errant^ Sabella 

 southerni, sp. u., was met with at Station 8, in 540 fathoms ; 

 Sabella murrayi, sp. n., in 555 fathoms at Station 11 ; and 

 Chone duneri in 53 fathoms at Station 3. 



Sabella hystricis, sp. n, 



Dredged in the 'Porcupine' Expedition of 1870 at 

 Station 27 in 322 fathoms, in fine grey mud. The single 

 example appears to have been dried, but, so far as can be 

 observed, the branchiie and the general surface are pale. 

 The collar shows a wide dorsal gap in the middle line, and 



