258 Pi-of. M'Intosli's Notes from the 



which occurs ahundaiitl) on flie oyster-beds at Whitstable, 

 and is readily kept in a sinail aquarium, where it freely 

 multiplied, 



5. On the Nereldss of the ' Porcupine ' Expedition, 1870. 

 Only a single example occurred, viz,, a small male o( Nereis 

 Dumerilu, Aud. & Ed., in 30 fathoms in Tangiers Bay. 



<3. On Canadian Nereidae dredged by Dr. W/titeaves in 

 ike Gulf of St. Lawrence. 



Only two species of this family were obtained, viz., Nereis 

 peiagica, L., and Ceratocephala near Loveni, Malmgren. 

 The former widely distributed species occurred in considerable 

 numbers, though none were beyond medium size, especially 

 from Station 53 (Egmont Bank, a small rocky patch to the 

 north-east of Shediac Bay, in 10 fathoms), 1873, and again 

 irom Orphan Bank, Gulf of 8t. Lawrence, and at Stations 

 nos. 46-48 (near Prince Edward Island). The specimens 

 present no structural variation. 



Ceratocephala near Loveni, Malmgren. 



One example was in all probability procured in 1872 in the 

 deep water (313 fathoms) between the east end of Anticosti 

 aud the Bird Rocks, though no station is marked on the 

 bottle. 



In 1873 another was obtained at Station 7, in the deep 

 water (110-220 fathoms) between Anticosti and the Gaspd 

 Peninsula. 



The single species of Ceratocephala hitherto known is 

 characterized, amongst other things, according to Malmgren, 

 the originator of the genus, by the uniform condition of the 

 ieet : " Pedes per totum corpus fere eadeni forma " ; whereas 

 the form now described is distinguished by the reverse, the 

 feet in the middle or anterior part of the median region 

 liaving the dorsal ciiri so greatly developed as to form a 

 characteristic feature. As, however, this may be a sexual 

 variation, further investigation is required. 



The two examples aie small, neitiier exceeding half an 

 inch in length, and both are imperfect, about 24 bristled 

 segments in each case being present. One, however, was 

 larger than the other. 



The head (PI. VI. fig. 1) is of moderate size, and has a 

 median fissure in front, from which a groove passes to its 

 posterior border. The tentacles are subulate organs, rather 

 filiform at the tip. The palpi are somewhat small, but have 

 the normal jjosition, the distal region in each bearing a tapering 

 conical juocess, so different from the usual bulbous termina- 



