78 On Haliphysema Tumanowiczii. 



full details of the internal structure and vital phenomena of 

 the Ilah'phi/sema-like organism figured and described by him 

 in the * Annals ' for January last, under the title of Wagne- 

 rella horealis^ and which, upon the strength only of the pre- 

 sence of apparently self-secreted shortly acerate spicula within 

 the substance of the periphery, he pronounces to be a sponge- 

 form. In the preceding number of the same magazine, how- 

 ever (December 1877), Mr. Carter describes an undoubted 

 foraminiferous type, upon which he confers the name of Rotalia 

 spiculotesta^ the external test of which is chiefly composed of 

 similar-shaped self-secreted spicules. 

 Channel-Islands Zoological Station, 

 St. Heliers, Jersey, June 7, 1878. 



EXPLANATION OF THE PLATES. 

 Plate IV. 



Figs. 1, 3, 6, 6, 7. Various modifications of the test of Haliphi/sema Tuma- 

 noiviczit, as described in the text ; enlarged 40 diameters. At 

 fig. 5 pseudopodic processes and film-like extensions of the 

 internal sarcode are pi-otruded from the terminal aperture and 

 spread over the skeletal framework. 



Fig. 2. Upper portion of a specimen, exhibiting at a the entanglement in 

 the sarcode of the nauplian larva of some crustacean. 



Fig. 4. An abnormal example of the same species, which has apparently 

 adopted the deserted tube of the polyzoon Anguinaria spatu- 

 lata as a foundation for the construction of its test. 



Fig. 8. An embryonic and naked condition of the same species, enlarged 

 100 diameters. 



Fig. 9. A slightly more advanced phase of the preceding, previous to the 

 construction of a protective test, and in which short pseudo- 

 podia are produced from the surface of the periphery ; enlarged 

 200 diameters. 



Fig. 10. The earliest embryonic condition of Haliphysema Tumanowiczii 

 observed, in which the organism presents the aspect of a free- 

 moving Amneha ; enlarged 250 diameters. 



Fig. 11. Small poi-tion of pseudopodium, with fusiform dilatations, as 

 exhibited on cutting a specimen open; enlarged 2000 diameters. 

 A nucleus-like body and several vacuolar spaces are apparent in 

 the upper and larger of these dilatations. 



Plate V. 



Upper portion of the specimen of Haliphysetna Tumanowiczii delineated 

 in fig. 2 of the preceding Plate, with the pseudopodia in their 

 fully extended state, and exhibiting at a the nauplius (pre- 

 viously figured) in a semidigested condition. Other organic 

 particles captured in the web-like network of the anasto- 

 mosing pseudopodia are indicated at b b b. Enlarged 100 

 diameters. 



