Gaftij Mav'ine Laboratory , S'. Andreivt. 109 



and M'ith distinct but narrow wings, whereas the shorter 

 bristles have boldly curved tips, which, in some, are much 

 worn. The wings of these commence a little beyond the 

 cuticle. The number of the setigerous processes is the 

 same as in the other forms, viz., eighteen, the first three 

 being immersed in the tissues, only the tips appearing 

 beyond the surface. 



The anterior hooks, which are in a single row, follow 

 a similar arrangement to tiiose of the other species, but 

 have five teeth anteriorly besides a process above the prow, 

 and thus a greater nuini)cr, as a rule, than in the two previous 

 forms. The posterior outline is inllected, whilst the inferior 

 border of the base, after a slight inflection posterioily, 

 becomes convex as it approaches the anterior prow. The 

 posterior hooks do not differ materially from the foregoing, 

 except in size. The hooks differ from those of Melinna 

 maculata, Webster, in having a process between the prow 

 and the first tooth. 



The tube is composed of secretion covered with a layer of 

 mud. It is friable. 



The ninth form is Melinella macduffi, sp. n., a form 

 approaching Pista. The slender body is slightly enlarged 

 anteriorly, and gradually tapers })osteriorly to a delicate 

 tail, which terminates in an anus surrounded by a])out ten 

 long papillae. The posterior region in the preparations is 

 nioniliform. The dorsal surface is smoothly rounded, the 

 ventral flattened anteriorly and grooved posteriorly. The 

 glandular scutes are confined to the mid-ventral region, and 

 appear to be about ten in number. Segments fifty to sixty. 

 A\ liilst the tentacles readily separate on removing the animal 

 from its tul)e, the branchite generally remain. They form 

 two slightly branched organs, supported on stalks attached 

 to the first segment. The tip is dichotomously divided in 

 some parts, whilst in others it is irregular. Not more than 

 a dozen filaments of all kinds occur in eaeii branchia. 



The setigerous processes, which commence on the third 

 segment, are minute aiul appear to be about eighteen iu 

 number. Each bears a snuill tuft of translucent bristles, 

 witii delicately tapered slightly curved tips with narrow 

 wings, and arranged in two series, a longer and a shorter, 

 the shorter, however, being only a little within the tips of 

 the longer. 



The rows of hooks commence with the bristles, and in 

 single series. Each hook much resembles that o( Melinna 

 ciistata, having two distinct teeth above the great fang, 

 a somewhat narrow space below it, as the process ou the 



