622 SUMMARY OF CURRENT RESEARCHES RELATING TO 



eye instead of two might warrant its place with Stephanoceros, hut 

 the arrangement of tho cilia on the arms docs not agreo with that 

 genus. So far it lias only been found in Black Creek, Ontario, 

 attached to Ulricularia vulgaris. The gelatinous, suh-eylindrical 

 sheaths of F. milhii are usually attached in the upper axil of a 

 branch or leaf; it is usually solitary. The peduncle is short; tho 

 posterior attenuate ; the muscular part is long, and terminates in tho 

 broadly ovate body. The large mouth-funnel is but little broader 

 at its free edge than below ; the edgo of the mouth is drawn out into 

 fine, very long, flexible, trochal lobes, which are without the slightest 

 knob-like enlargement at the extremity. One to three eggs are to bo 

 seen in the tube ; but the author did not watch them till they were 

 hatched, and therefore was unable to determine certainly as to which 

 genus the animal should be referred. 



Echinodermata. 

 Development of Comatula mediterranean — M. J. Barrois finds 

 that the true blastopore of Comatula has nothing in common with 

 what is ordinarily regarded as such ; it closes before the end of 

 development and at the time when the cells of the mesenchym arc 

 being formed at the expense of the endodcrm. Immediately after its 

 closure the eudodermic vesicle is constricted into two parts ; the 

 two peritoneal sacs which are formed from the hinder portion do 

 not change their places, but are transformed into two discs which 

 unite around the intestine ; these discs do not extend beyond tho 

 organ, and give off no prolongations either backwards or forwards ; 

 the cord which is found in the stalk of the young pentacrinoid larva 

 is formed exclusively from the mesenchym. The vestibule or ten- 

 tacular chamber is formed at the expense of the so-called blastopore ; 

 this last is not an orifice destined to disappear, but a pit which 

 appears late. When the larva becomes fixed this pit deepens, and 

 gives rise by invagination to an entirely closed sac which makes its 

 way between the ambulacral ring and tho portion of the ectoderm 

 which will form the dome of the calyx ; here, as in Synapta, there is 

 a displacement of the larval mouth, while the pit and the blastopore 

 are the homologues of the mouth and anus of other larval echino- 

 derms. 



Nerve-terminations, Sense-organs, and Glands in the Pedicel- 

 larise of Echinids.f — Dr. O. Hamann has found and traced nerves in 

 the various pedicellari* — buccal, trifoliate, tridactyle, and gemmi- 

 forrn— in several specie s of Echinids ; and finds that from the main 

 nerves branches are given off to sense-organs and glandular sacs. 

 These sense-organs are elevations on the inner face of the valves of 

 the pedicellaria) in Echinus acutus ; there are two such sense-eleva- 

 tions on each tube in the gemmiform pedicellarire. In Strongylocen- 

 trotus lividus there is only one sense-elevation. 



In Spliser echinus granularis there are three elevations near the 



* Comptes Rendus, cii. (1S86) pp. 1176-7. 



t Ann. and Mag. Nat. Hist., xvii. (18SG) pp. 469-72 ; from SB. Jenaisch. 

 Gesell. f. Med. u. Naturwiss.. 1886. 



