122 F. W. PHILLIPS — NOTES Olf THE 



The next two orders, Foraminifera and Rabiolaria, are, I 

 believe, entirely marine. 



The sixth order, Heliozoa, includes the well-known sun-animal- 

 cule, Actinophrys Sol. It may be distinguished by the naked eye 

 as a whitish-grey particle, from which, when under the microscope, 

 a number of slender spines are seen to radiate. 



The central part of the body consists of simple sarcode. The 

 body is nearly motionless, but derives its food through the agency 

 of the pseudopodia ; as soon as an animalcule comes in contact with 

 these, it appears for a moment to be stunned, but if it is strong and 

 vigorous it soon recovers its powers, and struggles to break away 

 from the adhesive source of entanglement, but is rarely successful ; 

 when the struggle is great the neighbouring pseudopodia bend over 

 to assist in securing the captive, and then by their joint retraction 

 it is drawn into the substance of the body, its struggles become 

 "weaker and weaker, and it is soon assimilated. Actinoijhrys is a 

 very voracious animalcule ; I have seen it engaging four such 

 victims at once. 



In company with Actinophrys Sol, I have also found A. Ehren- 

 leryi, a variety characterized by the shortness of its spines. 



Somewhat resembling this is Actinosphmrium Eichhornii, which 

 ■was formerly described as an Actinophrys, but an important differ- 

 ence exists in the nature of the pseudopodia. Through the centre 

 of each runs a firm spine which penetrates the superficial zone, and 

 rests upon the surface of the central sphere. Several other repre- 

 sentatives have been found in Wales and Ireland, by Mr. Archer, 

 which closely resemble the exquisite marine Polycystina, but up to 

 the present time I have not had the good fortune to come across them. 



We now leave the Rhizopoda, and come to the second class, 

 riagellata ; here the appendages, instead of being pseudopodic, are 

 flagellate or lash-like, and these flagella are the sole organs of pro- 

 gression. The first order of this class is called Trypanosomata. 



A Trypanosoma may be briefly described as an Amoeha of a 

 flattened shape, which flaps through the water by the undulations 

 of one extremity which is prolonged into a rudimentary flagellum. 

 There are two species in this genus, Trypanosoma sanguinis and T. 

 Eberthi. The first inhabits the blood of frogs ; the second is found 

 within the intestinal viscera of domestic poultry. I was anxious to 

 find this connecting-link with the Rhizopoda, and searched for it 

 in the last-named habitat. I found what I believe to be T. Eherthi, 

 but could not make out the form so satisfactorily as I could wish. 



The second order is called Rhizo-Flagellata, and includes ani- 

 malcules progressing by means of pseudopodia, but bearing one or 

 more flagella. 



In the third order, Radio-Flagellata, the animalcules emit ray- 

 like pseudopodia and possess flagella. I have not yet found any 

 examples of these two orders. 



The fourth order is called Flagellata-Pantostomata ; here we 

 lose the rhizopodous character, all the appendages being flagellate. 

 This is a very large order divided into eighteen families. 



