10 Prof. M'Tntosli's Notes from the 



with two long slender cirri. The sides have a series of 

 somewhut slender lainclloe for the hooks. 



The hooks (PI. II. fig. lU) diti'cr from any form described, 

 the outline being triangular with a straight posterior border 

 ending inferiorly in a process (probably for a ligament) and 

 a gently curved base. The anterior edge has five teeth, 

 which increase in size from above downward, the gulf below 

 the last being rather small, and the prow has an obliqne 

 front edge giving it a somewhat truncated appearance. 

 Their general shape agrees with that of Melinna cristata, 

 though the straight posterior ontline, the nnmber of teeth, 

 and the shape of the prow diverge. 



The tube is soft (woolly iu aspect), tears like soaked 

 cotton, and is made up of a vast series of minute Diatoms, 

 slender sponge-spicules, a few Radiolarians l)ound iu a mass 

 by the secretion of the annelid, not as usual in definite 

 internal and external layers, but forming a cotton-like mass 

 of a certain toughness. 



A fragmentary Oligochret, Hemitubifex benedeni*, Beddard 

 {CliteUio ater, Claparede), was procured between tide-marks 

 at the East Rocks, St. Andrews, in 18G3, the entire surface 

 of which was densely covered with greenish papillae, but 

 only the posterior region was secured. Each segment has 

 a slender tapering bristle and a stouter simple crotchet, 

 hooked and tapered at the tip (PI. I. fig. 9). In the 

 preparation the posterior concavity of the hook is directed 

 forward, and anteriorly the crotchets are less curved, as 

 shown by comparing a posterior crochet (PI. I. fig. 10) with 

 the foregoing (fig. 9). Wheu magnified (350) the surface 

 of the cuticle resembles shagreen from the dense coating of 

 the greenish papillffi. The posterior region is tapered toward 

 the tail, and this region has numerous tliccate Infusoria of 

 an elongate vase-shape attached by a pedicle. Such would 

 indicate that the tail is more or less free, as in the case 

 of Tubife.r rivuJorum. I am indebted to Dr. Beddard for 

 identifying this form and aiding nie with references. 



Dalzell t describes Lumbricus hirsutns as covered with 

 hairs, from the coast of Fife, with a pencil of bristles in each 

 segment, but this differs in colour, the anterior region being 

 whitish and the posterior dull red or umber. 



* Monogr. OUpocliset. p. 201 ; see also Proc. Zool. Soc. 1888, p. 485. 

 t Pow. Great, vol. ii. p. 140. 



