464 



INVERTEBRATE MORPHOLOGY. 



lum, being only about a millimetre in breadth, while the 

 purple Fhoxichilidium measures over three millimetres from 

 lip to tip of the legs, and the deep-sea form Oollossendeis has 

 a span of over sixty centimetres. The body proper is compar- 

 atively small, the four pairs of long legs which arise from the 

 thorax being exceedingly conspicuous, a feature which has 



Fig. 313. — PhoxicMlidium maxillare (after Mobqan). 

 suggested the term Pantopoda sometimes applied to the 

 group. Anteriorly there is a well-marked proboscis carrying 

 the mouth at its anterior end, and at the base of this there 

 arise the chelicerse, which are rather short chelate limbs. 

 The next segment of the body succeeding that which bears 

 the chelicerse bears upon its dorsal surface the eyes, and may 

 be regarded as a fusion of three segments since it bears three 

 pairs of appendages. The most anterior of these are slender 



