56 



The skeleton (Fig. 18) is of the same type as in the Temnopleurus and 

 Temnotrema larva, the body rod being only somewhat less elongate; it 

 is strongly thorny. There is no basket structure. The recurrent rod is 

 not curved forwards (at least in the single young larva preserved; I 

 have omitted to observe how it was in the specimens examined alive). 

 The postoral rod is fenestrated. (Some irregularities are seen in the 

 skeletal details figured, but not so much as to obscure the main features.) 



At the age of 15 

 days the larvae had 

 reached their full 

 size and were in the 

 beginning of meta- 

 morphosis. It is now 

 a most striking ob- 

 ject and one of the 

 most beautiful Echi- 

 noderm larvae. The 

 postoral and postero- 

 dorsal arms are very 

 wide at their base, 

 rather abruptly nar- 

 rowed towards the 

 point. They are held 

 almost horizontally 

 and thus directly 

 serve as a floating 

 apparatus. The fig- 

 ures do not show 

 these arms in their 

 natural position; PI. VII, Fig. 1, which was drawn from a living specimen, 

 shows the larva in half dorsal view; the postoral arms are seen in their 

 full breadth, while the postero-dorsal arms are seen half in profile; in reality 

 they are as wide as the postoral ones. PI. VII, Fig. 2 is drawn from a 

 preserved specimen; the postoral and postero-dorsal arms have con- 

 tracted to less than half their natural width and also the position is 

 more upright than normal, i) Across the base of each of these arms 

 is a large cihated epaulet. In the preserved specimens the epaulets 



fh.Zlt^ZH'T^^^ " °* '^""^ '"t^'^^t to represent the larva in preserved condition beside 

 the figure of the living larva in order to show directly the amount of shrinlcage due to preserva 

 tion. Such shrinkage appears to be unavoidable, especially in larv^ witf broad arase a 



arZ^dZTp-rie^i^r^lrfal.^""'^^' ^^ ''^^ ^^ — ^^^ ^^^^ 



Fig. 19. Part of the skeleton of a fully formed larva of MespUia 

 globulus; front view. """/i. Posterodorsal and anterolateral rods 

 as well as the dorsal arch have been omitted, b. body rod; 

 po. postoral rod; ptr. posterior transverse rod; vtr. ventral 

 transverse rod. 



