184 GLYCERACEiE. 



middle of each ; and the terminal piece of the bristle is elongate and 

 falciform {setce spinostB, Oersted), serrulated along one edge, and 

 terminated with a minute claw, 

 (a) Holy Island, Dr. Johnston. 



Plate XIV. Fig. 4. Ps. punctata, magnified. The line expresses the 

 length of the specimen from which the drawing was made. 



The Halimede venusta of Rathke differs in having apparently 

 fewer tentacula on the oral orifice. The view he gives is a front one ; 

 whereas our figure is taken from a proboscis compressed between 

 plates of glass, by which means the tentacula of both halves of the 

 circle are at once brought into view, and appear crowded. 



Fam. VII. GLYCERACEiE *. 



Glycerae^, Oersted, Annul. Dan. Consp. 32. 

 Glycerea, Grube, Fam. Annel. 59. 



Char. Body vermiform, nearly cylindrical, tapered towards both 

 ends, with numerous segments divided by plain sutures : head small 

 and segment-like, produced into a conical annulated snout with four 

 small antennae on the apex ; no eyes nor tentacular cirri : mouth 

 inferior, with a thick clavate proboscis, emaxillary or usually armed 

 with four hooked jaws, and sometimes also with a series of denticles 

 inserted in the inferior half : post-occipital segment footed like the 

 other segments : feet small, lobulated, with or without branchial 

 simple lobe-like appendages ; biramous, the rami partially coalescent : 

 bristles in two fascicles, each with a spine ; the bristles simple and 

 compound, the terminal piece dovetailed into the shaft and acicular. 



Obs. In all the Nereides which we have hitherto described, the 

 head is to be readily distinguished by its enlarged form and its dis- 

 similarity from the first segment; but in the Glycera there is no 

 marked line of separation between these parts. The head has the 

 appearance of a small pointed horn, and is indeed so like the anterior 

 end of the Earth-worm, that we cannot but perceive, in this sameness 

 of character, a certain approximation to a junction between the 

 families to which the Glycera and Earth-worm respectively belong. 

 Yet though this is unquestionable, still the Glycera is not the nearest 

 connecting link, for there are other Annelides errantes which par- 

 take more of the habits and character of the Terricolce. 



17. GLYCERA. 



Glycera, Savign. Syst. Annel. 36. Lam. Anim. s. Vert. v. 314. Aud. 8f 

 M.-Edw. Litt. de la France, ii. 241. Blainv. Diet, des Sc. nat. Ivii. 

 484. Williams in Rep. Brit. Assoc. 1851, 198, 214 (notR. Brown). 



Char. Proboscis with four black spinous and hooked jaws placed 



* From yXvKepbs, suavis, pleasant to look upon. 



