Gaily Marine Laboratory ^ St. Andreics. 45 



or prow is rounded and blunt, striae pass from tlie small 

 teeth on the crown alonj^ the posterior part of the neck. 



The cephalic region presents a broad horseshoe-fold over 

 the mouth — continuous at its outer and inferior edge -with 

 the larger collar which bounds the tentacular area posteriorly. 

 A deep groove, wide in the middle and tapered at each 

 side, is thus formed. Below the mouth is a short fold 

 bounded by the first-mentioned horseshoc-arch at each side, 

 and ventral to this a broader band or lip. 



The body has a normal shape, viz. enlarged anteriorly and 

 then gradually tapering to the posterior end. There are 

 seventeen jjairs of bristle-buudles, which commence on the 

 fourth segment and extend to the twenty-first. The Avinged 

 tips do not show serrations under a poAver of 350. Each of 

 the three branchise arises from a single basal portion, and 

 extends as simple slightly curled filaments therefrom, the 

 tips being slightly tapered. They seem to be considerably 

 shorter than those of Amphitrite cirrata^ O. F. M. Twelve 

 ventral shields or plates occur in front, the first being im- 

 mediatel}^ behind the posterior labial process, and a ridge 

 (maiking the nerve-cord) is continued from the last along 

 the ventral groove to the posterior end. 



Marenzeller describes the colour of the body as reddish 

 grey, brownish in front, and pale posteriorly. Tentacles 

 streaked and punctated with brown. Tn the examples from 

 tlie 'Porcupine'' brownish pigment still remained anteriorly 

 at the cephalic folds and between the ventral shields. The 

 bristles issue from an elevation at the dorsal edge of the 

 ridge for the hooks, and they form a vertical series in each 

 tuft. Moreover, six small papillae (third to ninth) occur im- 

 mediately beneath them, and situated at the posterior border 

 of the ridge for the hooks. 



The hooks differ from those of A. cirruta in the shorter 

 and less oblique base, which thus forms a different angle 

 with the crown. Four teeth occur above the main fang, as 

 in A. cirrata. The elevations or pads for the hooks are long 

 in front, stretching from the dorsal bristle-tufts almost to 

 the ventral groove. Behind the bristled region they form 

 small but ])romiuent lamelhy along each lateral region, and 

 there is liitle difference in structure between the anterior 

 and posterior hooks. The former are in a double row, the 

 latter form a single series. 



This differs from A. cirrata in the position of the papillse 

 at the anterior setigerous processes, and in the absence of: 

 the adjoining flap at the dorsal end of the rows of hooks. 

 Laphauia boecki, var. hystricis, was dredged in the Expe- 



