154 Mr. C. J. (lalian on (he Se/isor}/ N^ature of the 



\\c nijiy call the ])iiniaiv process of clip,estion. enters into the 

 condition of the spherical olobules, each surrounded by its 

 vacuole; and that these spheroids, f^radually decreasing in 

 size, are ultimately worked up into the so-called crystals *. 



To the further consideration of this and other questiona 

 raised I intend to return at length. 



EXPLANATION OF PLATE XII. 



Fiff. 1. Aniwba aftor treatment with gold chloride, a, refractive body 



(!' niicro-uucleus). 

 Fi(/. 2. Living Amwba. a, refractive body. 

 Fiff. 'S. Nucleus of living Amoeba, showing its relation to the refractive 



body (a) when at rest. 

 Figs. 4-6. Digesting matter in successive stages. 

 Fiffs. 7, 8. Homogeneous spheroids contained in vacuoles. 

 Fi(/. 9. Concretionary matters in relation to the small vacuoles. 

 Fig. 10. Relation between the spheroids and the so-called crystalline 



bodies. 



Figs. 1 and 2 drawn under Zeiss's apochromatic system, oc. 8ccmpeus. 

 obj. 14 honiog. immers. Figs. 3-10 drawn under same objective, with 

 substitution of oc. IB. 



XIX. — 071 the probable Sensory Nature of the "Appendix" 

 of the Antenna' of Coleopterous Larvce. By CllAllLES J. 

 Gahan, M.A., of the British Museum (Natural History). 



!Many Coleopterous larvae are provided with a remarkable 

 structure which is situated upon the distal surface of the 

 penultimate segment of the antennae. Though this structure 

 has been noticed by more than one writer on Coleopterous 

 larvse and has been described as an " appendix," an " appen- 

 dicular joint," a " blunt tubercle," and in other terms, it does 

 not seem to have attracted much attention. At least, no 

 author, so far as I am aware, has attempted to describe its 

 microscopical characters in detail. 



Some observations that I have recently made upon the 

 antennae of the larva of Pterostichus — a genus of Carabidre — 

 have led me to believe that the so-called appendix is in reality 

 a sensory organ. When the antennae of this larva are 

 examinea under the microscope the appendix is seen as a 

 tolerably cons])icuous object projecting from the oblique outer 

 (or posterior) surface of the distal extremity of the third 

 segment, its transverse diameter being very little less than 



• Ijb Uantec has shown tl/e vacuolar fluid of several Protozoa to be 

 acid (' Annates de l'ln.stitut Pasteur,' 1800, pp. 776 791). 



