51 



both sclerite and glands together are regarded as a compound 

 hypopharynx, Variations of the structures in various genera of 

 the two suborders of the Mallophaga are described and figured 

 and the homologies of the parts indicated. Attention is drawn 

 to the value of the hypopharynx as a character in splitting up 

 unwieldy genera. The wiiter further describes the problematic 

 '^ maxillary forks "—delicate phitinous splints lying unattached 

 within thes mouth, one on either side of the hypopharynx, — and 

 suggests tha.t they ai-e the third pair of maxillee, known as maxillulte 

 or superliugu?e of the hypopharyngeai or fifth segment of the insect 

 head, well developed in many primitive insects such as the Aptery- 

 gota, txnd probably also in certain btgtle larvfe. 



The next Meeting of the Society for Scientific Business will 

 be held on Tuesda}^, February 4th, 1913, at half-past Eight 

 o'clock P.M., when the following communications will be made: — 



F. E. Bedda bd, M,A , D.Sc, F.R.S., F,Z.S. 



Contributions to the Anatomy and Systematic Arrangement 

 of the Cestoiilea. — VIII, On some Species of IchihyQtcenta> and 

 OphidoUenia from Ophidia. 



H. G. Plimm er, F.R.S., F,L.S,, F,Z.S. 



Report Oil the Deaths which occurred in tlie Zoological 

 Gardens during 1912. 



H. L. Hawkins, M.Sc. F..G.S. 



The Anterior Ambulacrum of EcMnocardhim oordahmi Penn., 

 and the Origin of Compound Plates in Echinoids. 



G. P. Farran. 



Plankton from Christmas Island, Indian Ocean. — II. On 

 Copepoda of the Genera Oithona and Paroithona. 



