Gatty Marine Laboratory, St. Andrews. 47 



can generally be noticed at the end of the shaft. The 

 distinctions in this respect had not been observed by 

 De St. Joseph. 



The anterior crotchets have long curved shafts, commencing 

 as narrow bases, but gradually dilating to the shoulder, 

 which continues the curve and is narrower than the adjoining 

 part of the shaft. The neck is not constricted and the main 

 fang leaves it nearly at a right angle, whilst on the crown 

 are numerous small teeth. The whole crotchet has the 

 curvature of a bow. De St. Joseph speaks of nine crotchets 

 only, but occasionally about twenty are present ; and since 

 their narrow bases occupy a comparatively small area, the 

 group has the form of a fan, the broad tips requiring more 

 space for the action of their armature. The hooks of the 

 posterior region differ from those of Chone and Euchone, and 

 more resemble the type of the Sabellidse. Tiiey are charac- 

 teristically S-shaped, the base being smoothly curved ante- 

 riorly, convex interiorly, and turned upward posteriorly. 

 A slight constriction occurs at the neck, from which the 

 main fang comes off at less than a right angle, and is long 

 and sharp, whilst on the crown above are numerous minute 

 teeth. The posterior outline bends forward at the crown, 

 then backward, and has a bold forward curve in the main 

 part of the body. 



The differences between this species and J. caudata, 

 Langerhans, which Mr. Southern procured in Clew Bay, 

 seem to be slight — mainly the elongated caudal process, as in 

 the form procured at Madeira by Langerhans. 



Jasmineira caudata, Langerhans, 1880, is the nineteenth 

 representative, and it aj)pears to differ from J. elerjans only 

 in the presence of a filiform anal appendage. i\lr. Southern 

 states that the structures of the bristles and hooks agree, but 

 that the number of " abdominal " segments is twenty 

 (seventeen, Langerhans), whilst /. elegans had from twenty- 

 eight to thirty-two. The collar of J. caudata appears to be 

 somewhat higher than, and not so oblique as, that of 

 J. elegans. Mature specimens occurred in May. Dredged 

 in 17 fathoms in Clew Bay. 



The twentieth species is Haphbranchus (Bstuaynus, A. G. 

 Bourne, a minute aberrant Sabellid from the estuaries of 

 southern rivers and also from the mouth of the Liffey, Dublin 

 (^Southern) . 



The twenty-first form is Mijxicola infundibuliim, Montagu, 



