288 MYRIOZOID^. 



place and name. I have therefore decided, with the 

 greatest respect for Profesor Smitt^s opinion, to retain the 

 genus Hippothoa, which has not only a strongly marked 

 facies but also an ancient pedigree. In the Cretaceous beds 

 it is well represented by characteristic species ; and it is 

 widely distributed in the waters of our own epoch. 



Hippothoa divaricata, Lamouroux. 

 Plate XLIY. figs. 1-4 ; and Plate I, fig. 2. 



Hippothoa divaricata, Lamx. Expos. Meth. 82, pi. Ixxx. figs. 15, 16: 



Johnst. B. Z. ed. 2, 291, pi. li. figs. 3, 4: Busk, B.M. Cat. 



i. 30, pi. xviii. figs. 3,4*. 

 Catknicella divaricata, Blainv. Actinol. 462. 

 ? Hippothoa liANCEOLATA, Gray, Zool. Misc. 3o: Hassall, Ann. N. H. vii. 



366, pi. viii. figs. 5, 6 : Couch, Corn. Faun. iii. 102, pi. xviii. 



fig. 6. 

 Hippothoa Patagonica, Busk, B.M. Cat. pt. i. 30, pi. xvii. fig. 1 ; id. Crag. 



Pol. 24, pi. i. fig. 5. 

 Mollia hyalina, forma divaricata, Smitt, Qifv. K. Vetensk.-Akad. For- 



handl. 1867, Bihang, 17 and 112, pi. xxv. figs. 86, 87. 

 Hippothoa longicauda, Fischer {—H. Patagonica, Busk, Crag Pol.), 



Brj-ozoaires d. cotes du sud-ouest de la France, Actes Soc. 



Linn. d. Bordeaux, xxvii. 1870 (p. 21, Sep.). 



Zooecia more or less remote, ovate or pyriform, smooth 

 or finely striated transversely, glossy, of a pearly white- 

 ness, carinated in front ; orifice arched above, with a 

 notch in the lower margin. Ocecia small, globose, with 

 a boss in front, borne on cells which are somewhat 

 inferior in size to the ordinary zocecia. 



Var. a {conferta). Zocecia crowded, ovate or pyriform, 

 rather short, strongly striated transversely, the connect- 

 ing fibre rudimentary ; orifice arched above, with a 

 notch on the lower margin ; a prominent umbo imme- 

 diately below it. Ooecia rather large, rounded, broader 



* I do not include Audouin's H. divaricata amongst the synonyms, as it 

 possesses a very differently shaped mouth from tliat of the present species. 

 It is the H. Savignyana of D'Orbigny. 



