26 MR, W. F. LANCHESTER ON SIPUNCULIDS [Jan. 17, 



possible to draw a fixed line in brain-structure between the 

 diflei-ent groups of the Cercopithecidae. 



The above observations as to the adult brain are quite in accord 

 with those of Zuckerkandl *, who, however, figures only the 

 calcarine and adjacent fissures in a memoir which appeared about 

 the same time as my own already referred to. 



[I have just examined a third brain of Cynopithecus (a young 

 female, which died on the 7th inst.), and find it like that of the 

 male described above. — March 9th, 1905.] 



4. On a Collection o£ Sipuncnlids made at Singapore and 

 Malacca. By W. F. Lanchester, M.A., Assistant 

 Lecturer and Demonstrator in Zoology in University 

 College, Dmidee f. 



[Received November 1, 1904.] 



During a joint expedition on the part of the late Mr. F. 

 P. Bedford and myself to the Malayan region, 1 turned my 

 attention in part to the collecting of GejDhyrea. In the relatively 

 limited area which Ave examined, it was perhaps not to be expected 

 that much would be found in the way of species in this compara- 

 tively small group, but even allowing for this the I'esults are 

 distinctly disappointing. I have examples of only five species, 

 belonging to three genera ; in addition, I include another species 

 from Borneo, a specimen of which Dr. Hanitsch, of the Raffles 

 Museum, kindly handed over to me. All the specimens but one 

 were obtained by digging in wet sand or ooze, in which they wei'e 

 very common ; but many were rejected as being individuals of the 

 same species as those already caught. This I now I'egard as a 

 mistaken pi'oceeding, and I would again ui'ge on collectois that 

 a great deal of interest is pi-obably lost through following this 

 method. More specialisation and less heterogeneous collecting 

 seem the main desiderata nowadays. 



In preserving specimens I found the method (recommended, 

 I think, by Lo Bianco) of narcotising by pouring alcohol on sea- 

 water to be very uncertain ; and after two or three experiments 

 decided on the use of fresh- water as a nai-cotising agent, afterwards 

 preserving the animals in ^ per cent, chromic acid. I believe 

 this method to be the best on the whole ; though, seeing that even 

 Sipunculids have their individual idiosyncracies (and the different 

 efiects of the same method on different individuals is most 

 surprising), it is only the best as applied to an average number of 

 specim.ens. 



* "Zur Morphologie des AfFengehirns," Zeitsclir. Morpli. u. Authr. vi. 1903, pi. xii- 

 fig. 16. 



f Communicated by the Secbetaet. 



