271 



Sdeì'onephthìja (Wright and Studeij need not be considered, but there 

 is undoubtedly retationshij^ with Lemnalia (Gray emend. Bourne). From 

 this genus, however, our specimen differs essentially, in that it is not 

 branched, and in having the anthocodiae pedicelled. Other features, 

 such as the form of the Verrucae, the nature of the anthocodiae, the 

 introversion of the zooids and the general details of the colony, mark it 

 off as a new and very distinct genus. 



Diagnosis. 

 Agaricoides cdcocld n. gen. et sp. 



Colony upright, attached, mushroom-shaped (agariciform), consisting 

 of (1 ) a stout, densely spiculose trunk composed of a longitudinally arranged 

 system of coenenchymal canals with fused walls, the more superficial of 

 which appear as ribs on the surface; and (2) a "pileus" portion bearing 

 the zooids which are introversible within projecting Verrucae — cylin- 

 drical extensions of the trunk canals, the upper portions of which are 

 expanded peripherally into octagonal discs containing eight canals, cor- 

 responding to the eight compartments formed by the retractor muscles. 

 The anthocodiae are borne on somewhat slender stalks, the elastic walls 

 of which are continuations of the upper walls of the discs. The tentacles 

 are not retractile but are simply folded over the wide oral disc, the 

 biserial arrangement of the spicules forming a very primitive operculum. 

 The oral disc is spacious, protected by eight triangular projections of 

 spicules. The mouth, considerably elongated, leads into a richly ciliated 

 stomodaeum in which a distinct sulcus can be distinguished. The mesen- 

 teries are complete, and are continued down to the very base of the stem 

 canals. The spicules are irregularly echinate and consist chiefly of 

 straight and curved spindles, while some approach the "scaphoid" type, 

 others are single and "hockey-clubs", i. e. club-shaped with a curved 

 termination. 



Locality: Indian Ocean, 6" 31' N. — 79° 33' 45" E. 401 fathoms. 



3> Suir Anatomia degli Scafopodi. 



Del Dr. Arcangelo Distaso. 



Zool. verg.-anatom. Laboratorium beider Hochschulen Zürich.) 



(Con 6 figure.) 



eingeg. 12. Juni 1905. 



Questa mia nota preliminare non ha la pretensione di trattare a 

 fondo il difficile argomento che da due anni circa ho intrapreso a«stu- 

 diare. Dovendo farne una monografia e dovendo necessariamente 

 trattare dello sviluppo , che in questo caso può essere di grande aiuto 

 in alcune questioni controverse, credo utile, frattanto , dare questi brevi 



