BRITISH MARINE TURBELLARIA. 231 



56. Automolos HORRIDUS, n. sp. PI. XII, fig. 21. 



Length 1*5 mm. Body somewhat flattened. A slight constriction 

 occurs at the level of the otolith, separating off an anterior conical 

 portion. Behind this " neck " the body gradually increases in width, 

 to the posterior third of its length which ends in a sharply pointed 

 " tail." Pigment is absent, the gut alone giving a grey tinge to the 

 otherwise white body. Flagella are present at each extremity, and also 

 occur at intervals for a short distance behind the anterior end. Packets 

 of Rhabdites occur in large numbers on the surface of the body, 

 (fig. 21). Adhesive cells are present, although feebly developed on the 

 tail. The musculature is strong, enabling the animal to execute very 

 active movements, and to flex the sides of the body ventrally towards 

 the middle line. The mouth lies at the commencement of the posterior 

 third. The pharynx, inserted into the gut at the centre of the body, 

 is cylindrical and very muscular. The intestine lies chiefly in front of 

 the pharynx. Its cavity is produced into about twelve ceeca on each 

 side, placed fairly symmetrically. The specimen under examination 

 was starved, and in this condition the limit of the gut branches can 

 be clearly defined. Brain placed behind the otolith, oval, the long 

 axis coinciding with that of the body. An eye is absent. Testes in 

 this specimen not well developed. They occur behind and at the sides 

 of the brain. Vasa deferentia open behind the pharynx into a vesicida 

 se?ninalis, surrounded by accessory glands. The penis is pyriform and 

 muscular. The single pair of germaria lie opposite the base of the 

 pharynx. Elongate yolk-glands are placed at the sides of the gut. An 

 accident prevented the determination of the oviducts. 



Habitat. — One specimen dredged in 12 fins., Plymouth Sound 

 (F. W. G.). 



57. 1 Automolos ophiocephalus (0. Schmidt). PI. XI, fig. 18. 



1861. Monocelis ophiocephala, Schmidt (34). 

 1882. Automolos ophiocephalus. v. Graff (53). 



Length 1-5 mm. Body of a pink colour, very slender, elongate, the 

 anterior end broader than the rest of the body, and separated off by a 

 slight constriction. The hinder end when freely moving tapers 

 gradually to a point. During contraction it becomes thickened and 



