170 Transactions of the Society. 



IX. — On Synchieta fennica sp. n., and Remarks on the Resting-egg 



of Synchtvta pectinata. 



By Chaeles F. Kousselet, F.RM.S. 



(Bead March 17, 1909.) 



Plate V. 



Since the publication of my monograph of the Genus Synchseta in 

 the Journal of this Society in 1902, three new species of this genus 

 have been described, i.e. S. bicornis by J. G. Smith,* *S y . curvata by 

 0. T. Lie-Pettersen,f and S. atlantica by C. Zelinka.J The first 

 was found in 1902, in the brackish water of Lake Pontchar train, 

 Louisiana, and is remarkable in possessing two dorsal horn-shaped 

 outgrowths of the cuticula. S. curvata was found in the Fiords 

 near Bergen, Norway ; and S. atlantica was collected in mid- 

 Atlantic, to a depth of 400 m., in immense numbers, but only 

 within a well defined area, by the German Plankton Expedition 

 in 1889. 



Synchieta fennica sp. n., plate V. figs, la, lb. 



It is now my privilege to describe a fourth new species, S. 

 fennica, which I first observed in some marine material sent to me 

 by Dr. K. M. Levander from the Baltic, near Helsingfors, in 

 February 1900, containing S. baltica and S. monopus. I noticed a 

 small fully-contracted and hammer-headed individual, which I 

 suspected to be a Eotifer, but the nature of which I could not guess. 

 I called Dr. Levander's attention to this animal, but it was a con- 

 siderable time afterwards when he reported that it was a small 

 Synchmta, with two horn-like projections on the head, similar to 

 those of S. bicornis, which he found not infrequently in the sea on the 

 coast of Finland. Subsequently Dr. Levander sent a few sketches 

 of details and a few more specimens, and from these Mr. F. E. Dixon- 



* SyncJiseta bicornis : a new Rotifer from the Brackish Waters of Lake Pont- 

 chartrain. Trans. Amer. Micr. Soc, Sept. 1904, pp. 121-126 (1 pi.), 

 f Bergens Museums Aarbog, 1905, No. 10, pp. 1-44 (2 pis.). 

 X Die Rotatorien der Plankton-Expedition. Kiel and Leipzig, 1907 (3 pis.). 



EXPLANATION OP PLATE V. 



Fig. la. — Synchseta fennica. Dorsal view, x 300. 

 „ lb. ,, ,, Front of head. X 450. 



„ 2. ,, bicornis Smith. Dorsal view, x 345. 



,, 3. ,, pectinata. Resting-egg. x 165. 



