680 Reports on the Zoological Collections made in Torres Straits, 1888-1889. 



number of folds than in the last species described. The mesenterial filaments also 

 appear shorter in transverse section. The mesogloea is thicker throughout, and 

 usually contains more than one canal in each mesentery. 



These canals appear to run from the base of the mesenteries to the oesophageal 

 region. Near the base they appear to be connected with ectodermal spaces in 

 the body-wall. The endoderm of the mesenteries is very similar to that of the 

 body-wall. 



The longitudinal muscles are better developed than in Z. copinngeri, the 

 mesogloea being thrown into slight plaitings to support the fibres. Tlie parieto- 

 basal fibres, though distinct, are rarely supported by plaitings. 



Gonads. — The sexes appear to be distinct in this species also. All the speci- 

 mens examined by us containing matm-e reproductive organs were female. The 

 gonads are irregularly arranged as in Z. coppingeri^ 



This species somewhat resembles the preceding one ; spirit sjDCcimens can be 

 distinguished externally by the following characters : — Z. coppingeri is larger ; 

 markedly pyriform when contracted, and the brown spots persist (for at least 

 three years). 



Zoanth,us macgillivrayi, n. sp. 

 (PI. Lxi., fig. 6 ; PI. Lxii., fig. 3 ; PI. lxiii., fig. 2 ; PL lxiv., figs. 5-8). 



Form. — Body smooth, transversely wrinkled, with a thick cuticle, upper part of 

 column slightly swollen, disc large ; tentacles small, 32 in number, in two cycles ; 

 mouth very small. The capitulum in expanded specimens exhibits two encircling 

 grooves, which indicate the double sphincter muscle, coenenchyme forming a 

 flattened stolon. 



Colour. — Not determined when alive ; yellowish in alcohol. 



Dimensions. — Height of large specimens, 18 mm. ; average diameter of colour, 

 3 mm. ; diameter of disc, 6.5 mm. 



Locality. — Fringing reef, Mabuiag, Sept. 21, 1888. Six specimens. 



We acknowledge in the specific name we have given to this species the 

 zoological labours in Australasia of the late J. Macgillivray, author of the valuable 

 "Voyage of the Rattlesnake."* 



Body-wall. — The wall of the upper part of the column is comparatively thin. 

 Lower down it is much thicker. The cuticle is thick, and foreign bodies, 



* Narrative of the Yoyage of H. M. S. " Rattlesnake," commanded by the late Captain Owen Stanley, 

 R.N., F.R.S., during the years 1846-1850 (1852). 



