L U C E II N A R I ^ A N D T H E I R A L L I E S . 33 



muscular cords of the peduncle {Jigs. 37, 47, 47"), and the other {f/j. 37) through 

 a buncli of tentacles and one of the genital halves, and just within tlie periphery 

 of a longitudinal camera (t^) of the peduncle, a very good idea of the nearly uni- 

 form thickness of the chondrophys may be obtained. 



71. From the anchor — which lies a little beyond the distal end of the partition — 

 to the base of the proboscis where the partition terminates (»j-'), there is a very slight 

 but distinct and gradual increase in depth, and from the latter'place to the entrances 

 {fg. 50, T*) of the peduncular camera", tliere is no change; but, passing beyond that, 

 the gelatinous mass abruptly expands and stretches to the very axis of the peduncle 

 (c') and fills up all the space between the four chambers (t^). The relation of the 

 several parts here mentioned is exhibited best in a comprehensive manner by making 

 a transverse section of the peduncle {Jig. 52), which at the same time displays the 

 disposition of those portions that are concerned in the other longitudinal section 

 {^fig. 37). Taking the second course indicated, we find the chondrophys consider- 

 ably thinner than the average at the margin skirting the distal side of the tentacular 

 group (Jig. 37, <p), and commencing with a sharp edge; but passing backward it 

 rapidly thickens to the average measure and then stretches with unbroken unifor- 

 mity to the apertures of the chambers (r'') of the peduncle, and thence to the very 

 posterior end of the body with the same general thickness, but frequentFy indented 

 somewhat deeply (/?</. 51, c^) in such a way as to render its free surface, which abuts 

 on the camera, very ragged. That portion of it which forms the interior transverse 

 lining of the truncate terminations of the camerae is still more jagged than along 

 the sides of the peduncle, and it is also much thinner (_////. 51, c'). These inden- 

 tations are frequently so deep as to completely pierce the chondrophys, and then 

 they extend to the exterior wall (ecfojiJuytgnid) of the adherent disk. In a face view 

 of them (,fig. 19, t^) it becomes evident that they are so numerous and so disposed 

 as to form a sort of network by running into each other. 



72. By reverting to some previous paragraphs (57, 58) a partial description of 

 this peculiarity will be found, and in addition something about the lateral connec- 

 tions of the posterior ends of the camera; througli irregular passage-ways (r') in 

 the gelatinous mass. To render oftr description here complete we will refer to 

 those paragraphs for details concerning the adjoining organs, and fill up what is 

 wanting by adding further minutiae. These passage-ways are very easily displayed 

 for observation by sections which divide diagonally opposite cameras lengthwise 

 {Jig. 51, t'), and by a transverse cut across the peduncle just in front of the inner 

 face of the adliesive disk (.A".'/- 19)- I^^ the former may be seen the extremely 

 irregular and even branehing longitudinal projections (t'') of the passage-ways into 

 the axial solid mass (c') of the chondrophys ; and in the latter {Jig. 19, at c'^) is 

 tlie direct proof of how little of the chondrophys is left — a few columns — between 

 adjacent camerae by these extensive burrowings. The muscular cords {Jig. 19, r) 

 are scarcely exempt from these encroachments; at least their periphery is uncovered 

 by this substance, and would be laid bare in some places were it not for the lining 

 wall {endopliragma) of the camerse, which follows all tlicse sinuosities to their 

 minutest ramifications; and their posterior truncate ends are undermined by an 

 occasional diverticulum {Jig. 46, t) from the main burrows. Sections {Jigs, 61, 62) 



5 April, 1877. 



