238 R. I. POCOCK. 



backwards from their base^ converge and ineefc, without actual 

 fusion, in the middle line, expanding beneath the alimentary 

 canal to form a somewhat saddle-shaped enlargement for 

 muscular attachment. This structure is supported beneath 

 by a pair of slender chitinous rods which rise, one on each 

 side, from a point on the ventral integument of the fourth 

 somite close to tlie inner extremity of the tracheal stigma. 

 In front of this entosternite there is a pair of fibi'ous 

 nodules, each of which forms a centre for the attachment of 

 five tendons, one passing backwards to be attached to a 

 forwardly directed process from the expanded portion of the 

 entosternite, a second passing vertically downwards towards 

 the point of attachment of the entosternite, a third passing 

 forwards, a fourth obliquely downwards and outwards, and 

 the fifth downwards and inwards to the base of the rostrum. 

 Bernard (3 and 4) says the entosternite of Galeodes "rises 

 as a pair of infoldings of the cuticle between the third and 

 fourth segments," and his drawings represent the two pillars 

 as attached some distance from the middle line to the external 

 portion of the membrane between the coxte of third and 

 fourth appendages, no connection with the prosternal plate 

 being shown or mentioned. The only addition to be made to 

 his description relates to the attachment of the entosternite 

 to the prosternal plate as mentioned above. 



This attachment is of two kinds. In the case of a specimen 

 of Solpuga sagittaria the continuity of the entosternite with 

 the presternum and the intercoxal integument is plainly 

 indicated after clarification in caustic potash and immersion 

 in glycerine. I can find neither articulation nor sutural line, 

 to attest its obliteration, between the two. On the contrary, 

 the strengthening strands of thick chitin which traverse the 

 entosternite pass without interruption into those of the pro- 

 sternum, the two forming a rigid and continuous whole. A 

 similar state of things is shown in the figure of the skeletal 

 elements of the prosoma of Galeodes given by Schiinkewitsch 

 (10). 



The treatment mentioned above applied to the entosternite 



