NEW SPECIES OF EDWARDSIA FilOM NEW GUINEA. 525 



Since writing the above, I have had the opportunity of studying a single 

 example of Edwardsia beantempsii, de Q., and five examples of E. carnea, 

 Grosse, sent to me from Plymouth by the Director of the Marine Biological 

 Station. I kept these animals alive in an aquarium for some time, in 

 the hope that I might obtain larvse ; but, failing to observe any signs 

 of reproduction, I killed and made sections of them. As regards E. hcau- 

 tempsii, I have nothing to add to Faurot's account of the anatomy. The 

 five examples of E. carnea were often ensconced in holes bored by Saxicava 

 in a small piece of limestone. It was impossible to extract them from their 

 holes without injury ; so all five had to be killed at one operation^ and only 

 three were sufficiently well preserved in an expanded condition to admit of 

 microscopical examination. I will refer to these three as specimens A, B, 

 and C. 



A had 24 tentacles— one in each of the dorsal and ventral directive 

 megacoeles, three in the dorso-lateral, three in the ventro-lateral, and four in 

 the lateral chambers on each side of the body. 



In specimen B there were thirty tentacles, disposed as follows : — One in 

 each of the dorsal and ventral directive megacoeles ; four in each of the 

 lateral and ventro-lateral megacoeles ; on the right side of the body (left in 

 the drawing) five in the dorso-lateral megacoele, and seven in the corre- 

 sponding megacoele on the left side of the body. In this specimen, therefore, 

 growth had proceeded more rapidly in the left dorso-lateral megacoele than 

 in the right. 



In specimen C there were thirty-two tentacles : five in each dorso- 

 lateral megacoele, six in each lateral megacoele, four in each ventro-lateral 

 raesacoele, and the two dorsal and ventral directive tentacles. 



It is a good example of the irregularity of growth in Edwardsias that 

 in A and C the largest number of tentacles and mesenteries is in the lateral 

 megacoeles, but in B in the dorso-lateral megacoeles. In the living animals, 

 when fully expanded, no appreciable difference in the length of the 

 tentacles could be detected ; but in all the five specimenSj when expanded 

 and in repose, every alternate tentacle was held straight out in radial 

 fashion and the intervening tentacles were curled inwards towards the oral 

 disc. So far as I could determine, the dorsal and ventral tentacles were 

 always curled inwards. 



It was impossible to judge of the age of the tentacles by their lengths in 

 E. carnea ; but in specimen B, which was killed in a fully expanded 

 condition, I was able to observe that the micromesenteries were of different 

 lengths, and as the number of tentacles and micromesenteries in the dorso- 

 lateral megacoeles of this specimen was different, it afforded an excellent 

 opportunity of forming a judgment as to the order in which the micro- 

 mesenteries and tentacles were developed. Text-fig. 2, which is founded 

 on a combination of a series of transverse sections, shows that in the right 



