134 Messrs. Koren and Danielssen on the Development 



of the young had ah-eady acquired the radiate form, and were 

 provided with eyes, which could be seen through the above- 

 mentioned membrane. Unfortunately, we found none in the 

 state of embryos, but we succeeded in finding some in the 

 larval state. In these the body was of an Oval form, a little 

 waved in the middle, and at its upper part a buccal opening 

 was perceived, which descended towards an extremely delicate 

 intestinal canal. The larvae being peifectly opake, we were 

 obliged to employ a careful pressure to show the internal organs. 

 By this compression we saw that the skin was furnished here 

 and there with calcareous particles ; in other respects, the body 

 was composed of a dark, granular mass. The buccal orifice 

 appeared in the form of a funnel ; it led to a delicate and narrow 

 intestinal tube, of the same width throughout, except at its 

 upper part, which was a little widened in the form of a funnel 

 towards the buccal orifice. 



The intestinal canal, after passing towards the posterior part 

 of the body, made a curve to the right, and was then lost in the 

 dark vitelline mass. In the interior of the body, and nearly in 

 the middle, a mass of dark, closely-packed granules was observed 

 (the commencement of the stomach of the Star-fish). This dark 

 spot was already surrounded by a circular aquiferous canal. A 

 hollow tube arose from the back of the larva (the commencement 

 of the sand- canal), and terminated in the interior of the cii'cular 

 canal. We could not observe whether this tube had an external 

 opening. 



Another larva which we examined had five rounded rays at 

 the margin. On the dorsal surface, towards the margin of one 

 ray, there was a small, projecting, buccal orifice, which led to the 

 delicate intestinal canal. When this larva was compressed, the 

 buccal orifice and the intestinal canal appeared more distinctly, 

 and although the latter was extremely delicate, it could never- 

 theless be traced to its opposite extremity, where it described a 

 curve to the right, and opened upon the back of one of the rays. 

 In the middle of the Star-fish a dark, round body (the stomach) 

 was distinctly seen, with the aquiferous canal and the sand- 

 canal which opened into it. No trace of ambulacra could be 

 discovered, but, on the other hand, several irregular calcareous 

 pieces were seen in the mass of the body. 



The third young animal was much larger, and had five obtuse 

 rays distinctly developed. At the middle of the extremity of each 

 rav there was an eye, composed of three pigmentary agglomera- 

 tions, formed by dull orange-coloured pigment-granules. The 

 larval mouth, which was slightly prominent, was situated to the 

 left between two rays. The intestinal canal and the anal orifice 

 could still be seen distinctly. Calcareous sj)incs had been 



