264 Prof. M'Infosli's Notes from the 



Posteriorly the lieight of the dorsal lobe diminishes and it 

 projects as an acute process. Tiie length of tlie dorsal cirrus 

 and branchia increases, and the lamella and cirrus in the 

 inferior division are also considerably elongated, so that they 

 form two slender processes. Just in front of the tail the 

 branchia is reduced to a short process. Inferiorly the ventral 

 cirrus is large, but the lamella above it has disappeared. 



In contrasting the foregoing with the descriptions and 

 figures of Ehlers, the eloneated upper lamella in the European 

 form differs. Moreover, Ehlers states that the anterior tufts 

 of bristles do not show the transverse markings, whereas, 

 though less distinct than in the typical form, such are present 

 in the European. The mode of preservation, however, may 

 be connected witli this difference. Ehlers refers to the scale- 

 like ventral fold at the base of the foot. 



4. On the Nephthydida^ of the Gulf of St, Lawrence, 

 Canada. 



These formed part of a very interesting collection of 

 annelids made by Mr. J. F. Whiteaves (now of the Canadian 

 Geological Survey) in 187], 1872, and 1873, the result of 

 several dredging expeditions in the Gulf. A previous paper 

 on the subject will be found in the 'Annals' for April 1876. 

 An abundant form is Nej^hthys ciltata, O. F. M., a widely 

 distributed species on European shores. One of the Canadian 

 examples is large and another has a Crustacean parasite 

 attaclied dorsally. 



Nephthys canadensis, sp. n. 



Dredged at Stat. A 1 and A 8, 1872, and no. 29, Bradelle 

 Bank, 1873. 



Head elongated from before backward and with a pair of 

 short conical anterior tentacles. The second (ventral) j)air 

 are somewhat lanceolate and occur after an interval. The 

 cirri of the first foot are also short and lanceolate. 



Body of the typical form and attaining a considerable size, 

 probably at least G-7 inches. The furrows of the middle 

 region behind the mouth slant from the median line outward 

 and backward. 'Jlie proboscis shows numerous small papillaj 

 at its distal end in extrusion, the rest being smooth. No 

 specimen, ho^\evcr, shows the organ completely extruded. 



The foot (PI. Yll. fig. 1) presents two widely divergent 

 regions, as in A\ incisa. Anteriorly the dorsal division has 

 a small rounded lamella at its base, the flattened dorsal cirrus 



