DOUBTFUL GENERA AND SPECIES. 195 



Genus Pyramis. 



Pyramis tetragona, Otto. ' Nova Acta/ t. xij ] 823. 

 Eudoxia pyramis, Eschscholz. 



Apparently the distal nectocalyx of an Abyla. 



Genus Physophora. 



P. alba and P. intermedia of Quoy and Gaimard (' Voy. de rAstrolabe,' Zoologie, t. iv) 

 both belong to the genus Agalma. 



Genus Plethosoma. 



P. cristalloides, Lesson. ' Voy. de la Coquille/ Zool., ii, 2, 64, 1830. 



This is a combination of a contracted piece of one of the Stephanomiadce with an Abyla, 

 apparently A. pentagonal 



Genus Polytomus. 



P. cruciata, Lessou. ' Voy. de la Coquille/ Zool., ii, 2, p. 45, 1830. 

 A detached nectocalyx of one of the Physophoridce. 



Genus Racemis. 



R. ovalis, Delle Chiaje. ' Memorie,' t. iv, p. 4, and p. 30. 1829. 



The account of this genus, given at p. 4 of the fourth volume of the ' Memorie,' is but a 

 dilution of the following ' Descrizione technica,' at p. 30 : " Bacemis — Vesiculse globosae 

 celerrimo mota prasditse et in formam ovatam dispositse. B. ovalis — Corpore ovali vesiculis 

 S^lobosis.'' The figures given. Tab. L, figs. 11 and 12, are quite unintelligible to me. 



Genus Ratis. 



R. Medusm, Lesson. ' Voyage de la Coquille,' 1830, Zool., ii, 3, p. 60. 



Apparently a young Porpita, but there is no figure, and the description is very 

 imperfect. 



