ROYAL MICROSCOPICAL SOCIETY. 97 



Mr. Slack handed in a paper " On the Optical Appearances of 

 Cut Lines on Glass." 



A paper was read " On Linear Projection considered in its 

 Application to the Delineation of Objects under the Micro- 

 scope." 



May 3rd, 1871. 



A paper was read " On the Structure of Lepidopterous Scales 

 as bearing on the Structure of Lepiclocyrtus curvicolUs,^' by Dr. 

 Maddox. 



A paper was read " On the so-called Suckers of Dyticus, and 

 the Pulvilli of Insects," by Mr. Lowne. 



June Till, 1871. 

 A paper was read " On Mycetoma, or the Fungus-foot Disease 

 of India;" also a paper by Dr. Braithwaite " On the Structure of 

 Bog Mosses." 



Octoher Uh, 1871. 



The first meeting of the session was held on October 4<th, 1871, 

 Mr. W. Kitchen Parker, P.R.S., President, in the chair. 



Mr. Parker contributed a valuable paper " On the Development 

 of the Facial Arches of the Embryo Salmon," at the conclusion 

 of which he expressed his opinion that the development of the 

 brain case of the osseous fishes demonstrates that group to be 

 much more closely allied to the Sauropsida, or birds and 

 reptiles, than it is to that of the Batrachia, or frog tribe. Mr. 

 Parker highly eulogised the use of chromic acid as a medium for 

 hardening, without distorting, the substance of the brain when 

 required for sections. 



Dr. Spencer Cobbold handed in a report on some pre- 

 parations of entozoa, with accompanying notes, forwarded to 

 the Society by Mr. Morris, of Sydney, and made observations 

 on some of the most interesting forms of the fine species col- 

 lected by Mr. Morris. Dr. Cobbold stated that by far the 

 greatest amount of importance was to be attached to the 

 discovery in Australia of Stejylianurus dentatus. This entozoon 

 was introduced to the scientific world as early as the year 1834 

 by batterer, who found it in large quantities infesting the adipose 

 tissues of a breed of Chinese pigs on the Rio Negro, in Brazil. 

 Up to the year 1S70 nothing further was heard of this parasite, 

 when Dr. Cobbold received a communication from Prof. 

 Fletcher, of New York, stating that it was committing great 

 destruction among the pork-raising districts of the United States, 

 thousands of pigs in some localities falling victims to its ravages. 

 In aspect and structure Stephanurus bears a close resemblance to 

 Trichina, but is of much larger size, the cysts of the former 

 frequently measuring an inch or an inch and a half in length ; its 

 greater magnitude is the principal safeguard against its introduc- 

 tion into the human subject. — {Nature, October 12th, 1871.) 



VOL. XII. NEW SER. G 



