li'24 Mr. 11. J. Carter on a netc Species o^* Dittiiigia. 



convex, aecoiupanied on each side by a crurifunn conical ex- 

 tension ut" the test ; anterior extremity narrow, terminating in 

 a contracted oral orifit-e bordered ])y ])ointed scales, which, in a 

 circular form, slightly overlapping each other, cover the whole 

 of the test in great uniformity. 



Animal composed of colourless granular savcode, emitted 

 anteriorly in obtuse pseudopodial prolongations (c) for pro- 

 gression and the ca))ture of food ; ventral })ortion more or less 

 charged with fragments of Alg» and oil-globules (y) ; poste- 

 rior extremity containing a large nucleus and nucleolus (e), 

 several re]»roduetive (?) cells, and one or more contracting ve- 

 sicles {/, d). Body tied by three sarcodal filaments (It) to the 

 posterior part of the test and to the extremities of the hollow, 

 conical, leg-like appendages respectively. Molestation causing 

 the body to assume a spherical form, synchronously with 

 which it is suddenly retracted by the sarcodal filaments to the 

 posterior end of the test (fig. 7^?). Size about 1-1 82nd of ati 

 inch long by l-.'}53rd in its broadest part. 



Hah. Freshwater pool in heath-bog. Living on minute 

 Algae {OsciUaria &c.). Progressing after the manner of Dif- 

 flugice generally, with the test vertical and fundus uppermost. 



Loc. Budleigh-Salterton. 



Obs. I found three or four specimens of this Diffiugia about 

 a year since, in the surface-pool of a heath-bog about a mile 

 from this place, viz. on the 29th of January 1869. 



There were other DiffiugiiP present ; and I sketched a large 

 one having oval and square plates upon its test heterogeneously 

 mixed up with grains of sand — showing that the oval and 

 square ])lates, Avhich frequently and respectively form the 

 coverings of Difflugian tests exclusively, are derived from ex- 

 ternal sources, and may be taken up by some of the Diffiugice 

 indiscriminately, with grains of sand and other like objects, 

 although they (the oval or the square plates, as the case may 

 be) are frequently selected for the covering of the test, to the ex- 

 clusion of all other objects, and consequently that the presence 

 of one or the other is of no specific value. (See Dr. Wallich's 

 excellent and elalx^rate paper, with illustrations, on the Dif- 

 flugian Rhizopods, Annals, ser, 3. vol. xiii. p. 215 : 1864.) 



One cannot hel}) noticing in this mixture an analogy with the 

 arenaceous forms of Squannilt'na ^u?ii described, which animal, 

 although preferring grains of quartz and spongc-spicules, is 

 not particular in taking up any thing of the kind for the forma- 

 tion of its covering which it may find appropriate. 



The light yellow colour of the test of Dipiigm hipefi, toge- 

 ther with its obtuse pseudopodia, cause it to differ from Ev- 

 yll/pfiOj where the test is colourless and the j>sfudop(jdia 



