Eev. E. Williams's List of Shropshire Lichens. 183 



a reddish-brown longitudinal streak is seen on each side, com- 

 mencing at the head and running along the back; but these 

 usually reach only to the glandular stomach. 



In conclusion, I may cite an observation upon the occurrence 

 of the freed, sexually mature bud offspring {Sacconereis and 

 Polybostr{chus\ which I do not find mentioned anywhere else. 

 These bustle about exactly in the manner of the swarming 

 Annelide-larvae, and, indeed, among the latter at the surface 

 of the sea ; so that, in nearly every glass filled with the small 

 animal forms fished from the surface of the calm sea by means 

 of the fine net, I regularly found several of them, and usually 

 male examples. These possessed great mobility. Primary 

 individuals I have never found at the surface ; and the reason of 

 this is easily understood. 



EXPLANATION OF PLATE Vin. 



F'kj. 1. Anterior part oi Aidolytus proUfer., witli the head, the first body- 

 segments, and the principal sections of the alimentary apparatus : 

 fl, oesophageal tube, with its circlet of pointed denticles at its 

 anterior orifice, and its posterior half bent into loops ; b, glan- 

 dular stomach ; c, intestine. 



Fig. 2. The posterior segments of the primary animal, containing ova, with 

 a yoimg animal adhering to them, still united with them by a 

 common intestine, and completely filled with ova : d, the new- 

 formed head of the young animal, with the new-formed eyes and 

 tentacles. 



Fiff. 3. Composite uncini of Autolytus proUfer. 



XXVI. — Notulce Lichenologicce. No. XXI. 

 By the Eev. W. A. Leighton, B.A., F.L.S. 



Amongst the MSS. of the late Rev. Edw. Williams, Incum- 

 bent of Battlefield and Uffington, Shropshire, is a catalogue 

 of all the plants which he had detected during many years' 

 careful herborization of the county of Salop. Mr. Williams 

 was in frequent correspondence with Sir J. E. Smith, the 

 Sowerbys, and other contemporary botanists. His accuracy is 

 well known, and perfect reliance can be placed on any plant 

 which he recorded. The whole of the Catalogue, so far as 

 regards the flowering plants, is embodied in my ' Flora of 

 Shropshire.' But I have thought it might not be altogether 

 unacceptable to publish the list of Shropshire Lichens. Though 

 not a complete list, it is a fairly comprehensive one, consider- 

 ing that at the period of its compilation the microscope was 

 not used in the determination of these plants. 



To this list I have added between brackets [ ] brief remarks 



