and their relation to existing Animals. 127 



A short Diagnosis of the three new Polygastric Genera. 



1. Actinogonium. 



Animalculum e Polygastricorum Bacillariis Naviculaceis prismaticis non 



concatenatis, testae suborbicularis angiitis 7 (aut pluribus ?). 

 A. septenarium. 



2. Dictyolampra. 



Animalculum e Polygastricorum Bacillariis Naviculaceis orbicularibus 

 non concatenatis, testae bivalvis disco aperturis non perforato, dissepi- 

 mentis internis nullis, valvulis paribus in solo medio disco cellulosis, 

 in laevi margine radiatis. 



D. Stella. 



3. Liostephania. 



Animalculum e Polygastricorum Bacillariis Naviculaceis orbicularibus 

 non concatenatis, testae bivalvis disco aperturis non perforato, disse- 

 pimentis intends nullis valvulis paribus (?) in medio disco et in mar- 

 gine laevibus, radiorum, saepe validorum, corona centrum laeve cingente. 



L. Rotula, radiis (6 — 14) simplicibus. 



L. comta, radiis (6 — 13) supra punctorum corona conjunctis. 



L. magnified, radiis (12), infra radiolis binis, supra punctis interpositis. 



EXPLANATION OF PLATES V. and VI. 



The figures contained in these plates represent a few of the numerous 

 elegant forms of the cellular animalcules of Barbados, magnified from 200 

 to 100 times in diameter*. 



The figures 1 to 7 are solitary animalcules, and belong consequently to 

 the first division of Polycystina. 



The figures 8, 9, 10 are forms of compound animalcules (Polypenstocke) 

 belonging to the second division of Polycystina, and are of a similar relation 

 as Peneroplis and Pavonina among Polythalamia, 



Plate V. 



Fig. 1 . Eucyrtidhim Ampulla, front view. 

 Fig. 2. „ „ seen from below. 



Fig. 3. „ „ seen from above. 



Fig. 4. Rhopalocanium ornatum. 

 Fig. 5. Podocyrtis Schomburgkii. 



Plate VI. 

 Fig. 6. Anthocyrtis Mespilus. 

 Fig. 7. Lychnocanium Lucerna. 

 Fig. 8. Haliomma Humboldtii. 

 Fig. 9. Astromma Aristotelis. 

 Fig. 10. Stephanastrum Rhombus. 



It has been considered preferable to omit some of the minor figures of 

 the original plate, and to substitute his interesting Eucyrtidium Ampulla as 

 seen in different positions, a drawing of which was obligingly furnished for 

 that purpose by Professor Ehrenberg. 



* Professor Ehrenberg observes, that these illustrations are magnified 

 about a third less than his figures of Polygastrica, which are uniformly mag- 

 nified 300 times. 



