644 SUMMARY OF CURRENT RESEARCHES RELATING TO 



that of tlie Monotidas in that it contains among the ordinary ciliated 

 cells others which are agglutinating ; in these the cilia are replaced by 

 rough bodies which look like microscopic brushes ; by the aid of these 

 the delicate worms attach themselves firmly to the smoothest bodies. 

 The reproductive apparatus is also similar to that of the Monotidae, and 

 the creature is monogonoporous. The digestive apparatus, on the other 

 hand, is elegantly branched, and even in its slightest details resembles 

 that of other Triclades. 



It is necessary to form a new genus for this Planarian, on account 

 of the presence of an auditory vesicle, of tactile setae, and of ciliated 

 pits, which are characteristics of the Ehabdocoela. 



S. Incertse Sedis, 



New Species of Phoronis.* — M, L. Eoule describes a new species 

 of Phoronis found at Cette. The individuals live in cylindrical tubes, 

 with resisting walls, formed by a delicate chitinous layer strengthened 

 by numerous small debris of sand. The tube varies from sis to ten cm. 

 in length and is from one and a half to two mm. wide ; the animal is 

 three to four cm. long and one or one and a half mm. wide ; it has from 

 forty to fifty tentacles. In all these points the new species is very 

 different from P. Mppocrepis. The presence of two species of Phoronis 

 in the Mediterranean explains the presence of two types of Actinotrocha ; 

 for the new Phoronis the specific name of Sabatieri is proposed ; 

 individuals are to be found on the free valves of Tapes. 



New Marine Larva. f — Mr. J. W. Fewkes describes a remarkable 

 larva found in the Bay of Fundy and allied to Mitraria. The body 

 is hat-shaped with a narrow lim, gelatinous and transparent ; there are 

 two ciliated regions, one at the apex and the other on the rim. A bifid 

 protuberance hangs down from the pole of the larva opposite the apical 

 tuft of cilia, and from it arise two fan-shaj)ed bundles of provisional 

 setae ; these can be drawn together or separated. Under the apex 

 there is a thickening of the epiblast which is connected with the 

 marginal belt by means of a fine thread. There is a long tubular ceso- 

 phagus, the inner wall of which is richly ciliated, and which opens into 

 a simple elongated stomach without cilia. The larva, when expanded, 

 is from • 15 to "2 mm. in diameter. 



This curious form has Chsetop od, Brachiopod, and Bryozoan features, 

 and may be supposed to resemble the archetype or ancestral form of 

 these three groups. It is suggested that the term Mitraria should have 

 its significance enlarged and be the name for the common ancestor of 

 these three groups. Its characteristic features are (1) an apical tuft of 

 cilia mounted upon an epiblastic thickening ; (2) a mouth surrounded 

 by a ciliated rim ; and (3) a protuberance near the mouth from which 

 arise embryonic setee. 



Echinodermata. 



Ludwig's Echinodermata.:!: — Prof. H. Ludwig has published the 

 fourth part of this work. He continues his account of the calcareous 

 ring, and doubts whether it is ever altogether absent ; and then describes 



* Comptes Kendus, cix. (1889) pp. 195-6. 



t Ann. and Mag. Nat. Hist., iv. (1889) pp. 177-81. 



I Bronn's Klasaen u. Ordnungen, ii. 3, Echinodermata (1889) pp. 81-128. 



