THE society's NOTE-BOOKS. 121 



Caligus. — The family Caligid^ contains four British genera: — 



I. — Caligus. Fourth pair of feet slender, of only one branch, 

 and used for walking. A pair of small sucking discs on the lower 

 surface of the frontal plates. 



2 — Lepeoptheirus. Fourth pair of feet as in Caligus. Frontal 

 plates destitute of the sucking plates. 



3. — Chalifnus. Feet as above. Frontal plate provided with 

 a long and slender prehensile appendage, arising from centre of 

 its anterior surface ; and 



4. — Trebius. Fourth pair of feet slender, and divided into two 

 branches, adapted for swimming. No sucking discs on frontal 

 plate. 



Caligus is divided into (a) C. Diaphanus, (b) C. Rapax, (c) 

 C. Mulleri, (d) C. Centrodonti. 



The lunules are sucking discs by which the Caligi attach them- 

 selves to the fish. 



The mouth consists of a siphon, composed of two long slender 

 styliform organs, armed on their points with about twelve feet. 



The three pairs of foot jaws are used to fasten themselves to 

 their prey. 



The Caligi are only found on marine fishes. They can move 

 about on the fish and swim. Their food is doubtful. Some say 

 that they drink the blood of the fish. More probably by moving 

 their branchial feet they carry to their mouth the molecules from 

 the water and molecules from the fish. 



They change their skin. The young, when first hatched, differ 

 greatly from the adult (see Figs. 4 and 5). 



H. W. Elphinstone. 



Fresh Water Larvae, sent by Mr. Vial, was mounted without 

 pressure and without the use of potash. It was simply placed on 

 blotting-paper to drain, then soaked in oil of cloves for a month, 

 and mounted in balsam. 



Weevils — It is said there are 10,000 specimens of Cur cults ^ of 

 which 400 are British. They are very destructive to plants and 

 fruit. Balaninus mneum attacks nuts, boring the shell, for which 

 purpose its mouth is adapted, and depositing its eggs, which in 

 due course produce the larv^, who, after feeding on the nut, at 

 maturity bore their way out. 



H. E. Freeman. 



Coccus from Malta Orange. — On this slide will be found the 

 shell or case under which the creature lives, and in which it may 



