found on the South Coast of Devonshire. 103 



Length two lines. 



Colour dull red, with a white spot on the anterior part of the 

 back, but as the insect dies this mark is lost. Rare. 



Oniscus gracilis. 

 Tab. V. Fig. ft 



Body long, slender, sub-compressed, sub-cylindric, with eight 

 joints terminated by five large caudal appendages truncated at 

 their ends ; these are deflected nearly at right angles with the 

 body, the middle one fixed ; lateral ones jointed, and spread a 

 little upwards in a semicircular form : antennae four, short : le^s 

 fourteen, the anterior pair large, with broad feet, and slightlv 

 hooked claws ; the rest short and slender. 



Length five lines. 



Colour pale, clouded with rufous. Rare. 



Oniscus tiioracicus. 

 Tab. III. Fig. 3. 4. 

 Body ovate, inequilateral, with about fifteen indistinct joints 

 indented at the sides, the six posterior shooting into long lateral 

 fasciculate, fleshy, ramous appendages, and the extremity furnish- 

 ed with six simple recurved ones, two of which are larger than the 

 rest : antennae four, short, the outer pair longest, and only visible 

 above : the two first joints of the body furnished with a lono- flat, 

 oar-like, fleshy fin or cirrus on each side; the other joints with 

 similar short ones : legs fourteen, very short, crooked, and con- 

 cealed beneath : the abdominal valves are large, cover the 

 whole under part of the body, and form a receptacle for the ova, 

 which, in the specimens before me, is vastly distended with 

 many thousands of a pale orange colour. 



Length, 



