ON A VARIETY OF ALECXONA MILLART. 53] 



G-enus XXXIV. Ttpiilolabia, Scudd. 

 Scudd. Proc. JBost. Soc. Nat. Sist. sviii. p. 800 (1876J. 



Type, Forjicula (?) IcBvis, Phil., from Chili. 



Believed to belong to the genus lapyx, Hal. [Tliysanurd) . 



DESCRIPTION OF PLATE XII. 



On a Yariety of Alectona Millari (Carter). By A. Vaughan 

 Jennings, F.L.S., F.G.S., Lecturer on Comparative Ana- 

 tomy to the Birkbeck Institute. 



[Read 20th Novejnber, 1890.] 

 (Plate XIII.) 



In his ' Monograpli of the British Spongiadse,' Dr. Bowerbank * 

 figured a siliceous spicule, remarkable for its resemblance in form 

 to that of a Gorgonia, as belonging to a sponge that had " never 

 yet been determined." 



Mr. Carter in 1879 f described similar spicules associated with 

 microscleres of his sceptrella type, occurring in a homogeneous 

 dried sarcode. The sponge appeared to be of an excavating 

 habit, but on account of its association with Gliona this could 

 not be determined with certainty. He referred it to the genus 

 Oitmmina % under the name of G. WallicJui. 



* Vol. i. pi. xi. no. 244. 



t Annals and Magazine of Natural History, 1879, vol. iii. p. 353. 

 X Written Corticium but corrected subsequently. 

 LINN. JOUBN. ZOOLOGY, VOL. XXIII. 38 



