Gatty Marine Lahoratorijy ISt. Andrews. 110 



fang. The long straight gap at the throat differs from the 

 condition in Asi/chis biceps, and so with the general structure 

 of tlie hook. The iieciv is ohhiiuely striated. Tlie intestine 

 is distended with grey mud, which shows through tlie traus- 

 iueeut body-wall. 



4. On the Maldauidte dredyed in the Gulf of St. Lawrence, 

 Canada, by Dr. JFhiteaves: 



Besides the species specially mentioned hereafter, Praxil- 

 lella pnetermissa was pro.cured off Pugwash, Nova Scotia, 

 No. 59, 1873 ; iu 125 fathoms off" Cape Rosier, and at 

 Stations 35 aud 36 ; at No. 28 ; in Gaspe 13ay iu 30 fathoms, 

 at Stations A", 37, and 42, 1873. Praxillella (jracilis occurred 

 in Gaspe Bay, 30 fathoms, and at Stations 35-30 and 40, 

 9 miles off Souris Head, Trince Edward island. A form 

 closely allied to Ajciothella cateauta comes from 100-212 

 fathoms off" Anticosti (1871) ; A, No. 6, 1872, 30 fathoms 

 iu Gaspe Bay; and Nos. 37-12, 1873. 



Nicomache (?) canadensis. 



Dredged off" Port Hood, Cape Breton, aud other parts of 

 the Gulf of St. Lawrence by Dr. Whiteaves iu 1873, at a 

 depth of 175 fathoms. 



The anterior end (PI. II. fig. 4) of this large form is 

 obliquely truncated and marked by a prominent ridge like a 

 nose in lateral view, aud this roughly distinguishes it at first 

 sight from the large northern examples of Nicomache lumbri- 

 caiis. When seen antero-posteriorly the cephalic ridge 

 starts posteriorly from a transverse furrow, narrows a little 

 as it passes downward and forward to terminate in the 

 pre-oral arch of the snout. The nuchal groove on each side 

 begins a little in front of the posterior end of the ridge, 

 keeps closely to its edge, aud turns rather abruptly outward, 

 and becomes lost on the surface. The curve is quite 

 different therefore from that of N. lumbricalis from Finmark 

 or other northern area, aud besides the fiatness of the slight 

 elevation between them in the northern form is diagnostic 

 (PI. II. fig. 8), for iu the latter the curve is bold aud rounded, 

 as it also is in Nicomache muculata. 



The mouth (PI. 11. fig. 5) opens just behind the posterior 

 border of the snout as a puckered orifice with a transverse 

 line posteriorly, and having a wrinkled area between the 

 latter and the depressed groove bounding the peristomium 

 posteriorly. 



