8 AETEID^E. 



AKTEA TRUNCATA, Landsborough. 

 Plate I. figs. 8-11 ; Plate II. flg. 3. 



ASGUINARIA TRUNCATA, Landsb. Pop. Hist. Brit. Zooph. 288, pi. rvi. figs. 



57, 57*. 



?SALPINGIA HASSALLII, Coppin, Ann. N. H. ser. 2, ii. 273. pi. x. flg. 3. 

 AKTEA TRCNCATA, Busk, B.M. Cat. i. 31 : Hincks, Devon Oat, Ann. N. If. 



ser. 3, ix. 24 : Smitf, " Om Hafsbryozoernes Uttveckl.," CEfv. 



K. Vet.-Akad. Forhandl. 1865, 11, pi. ii. figs. 5-14, and 



pi. iii. figs.. 1-8 ; id. Krit. Fort., CEfv. &c. 1867, 279 & 



295, pi. xvi. fig. 1. 

 ?^ExEOP8i3 ELONGATA, Boeck, Forh. Vid. Sels. Christiania, 1861, 49. 



Zooecia short, straight, narrowed below, upper extremity 

 truncate ; surface minutely punctate ; a tubular appen- 

 dage frequently given off from the middle of the dorsal 

 surface ; swellings on the creeping fibre very slender, 

 clavate, generally distant. 



Sometimes the cells, instead of being simple, are linked 

 together in a single series, forming erect shoots, all the 

 cells in the series, except the primary one, being sup- 

 ported on long and slender pedicles. 



RANGE OP VARIATION. The zooecia differ much in size; 

 and a dwarf variety occurs, in which they are only about 

 half as large as the ordinary cell. The dorsal appendage, 

 which is in fact a rudimentary cell-pedicle, is sometimes 

 wanting. The habit is either simple, or a number of zo- 

 oecia are united in a single series, as in Eucratea. The 

 creeping stem is adnate or very loosely adherent. 



diagnosis, the case, it seems to me, does not come within the scope of the 

 " law of priority." There is no such species as Hippothoa sica ; and the 

 name simply lapses. 



It is hardly necessary to add that sica would be a most inappropriate de- 

 signation for the perfect Aetea recta, however well it may have fitted the 

 portion of it for which it was originally intended. 



D'Orbigny has repeated Couch's mistake, and founded his Stomatopora 

 (=Altcto) Gallica on specimens of the present species from which the upper 

 portion of the cells had entirely disappeared. 



