254 



DISCOVERY REPORTS 



the structure described in C. validus, Burger. During the examination of the material 

 by means of hand sections cleared in anilin oil it was generally found that the basement 

 membrane conformed to type, but sometimes it did not. On cutting diagonal and longi- 

 tudinal sections an explanation, based on the contraction of the muscles of the body, 

 was found to cover the differences. When the body is contracted the cutis is thrown into 

 circular wrinkles between which the basement membrane 

 is compressed, giving the appearance of type (iii), while 

 where the cutis bulges the type (i) cross-section occurs. 



No eyespots could be seen on clearing in anilin oil. In 

 the sections, however, a series of curious organs can be 

 observed close to the cephalic slits (Fig. 27). These are 

 spherical bodies that produced the granular appearance of 

 the inside of the slits in the living animal. They may 

 possibly have visual function although they appear very 

 similar in structure to fibrous nerve tissue. 



I give below a list of the stations at which specimens were Intosh. Part of a transverse 

 captured with the serial numbers of the specimens of which sect [ on of the head at the base 



^ . of the cephalic slit, eg, to show 



special investigation was made and sections cut. As 1 have the spherical granu i ar bodies, eo . 

 remarked this species is common in the area and a large 



number of specimens not included in the list below were taken from King Edward 

 Cove and also from Port Stanley Harbour, Falkland Islands, under stones at low tide. 

 List of stations at which Lineus corrugatus was taken. The dates, positions and depths 

 of these stations will be found in the list of stations on pp. 220-5. 



Fig. 27. Lineus corrugatus , Mc- 



